Testing Fuel System Inlet Vacuum ! CAUTION Failure to release pressure from the fuel system will result in fuel spraying out, which can cause a fire or explosion. Allow the engine to cool completely and release all fuel pressure before servicing any part of the fuel system. Always protect eyes and skin from pressurized fuel and vapors. 1. Separate the engine fuel line from the boat fuel line at the engine fuel inlet connection (inside the cowling). 2. Install a T‑fitting on the boat fuel line. 3. Install a clear fuel line on the opposite side of the T‑fitting. Connect the clear fuel line to the engine fuel line. 4. Install a fuel vacuum gauge (obtain locally) on the T‑fitting. 5. Clamp all fuel line connections securely to prevent vacuum leaks. 6. Start the engine and observe the clear fuel line for air bubbles. If the engine does not start, use the CDS G3 diagnostic interface tool. 7. At maximum fuel flow (full‑throttle engine operation), the vacuum gauge reading should not exceed the listed specification. a - Engine fuel line b - Clear fuel line c - T‑fitting d - Boat fuel line Description Specification Maximum fuel system inlet vacuum (see NOTE) 10.16 kPa (3.0 in. Hg) (1.47 psi) NOTE: This maximum value applies only to measurements taken at the engine, not to measurements taken elsewhere in the boat. The maximum value is with the fuel tank at half volume. A restriction in the fuel system will result in a vacuum reading higher than the allowable maximum. Some common causes of excessive vacuum include: • Restricted anti‑siphon valve • Restricted or malfunctioning primer bulb • Kinked or collapsed fuel hose • Plugged water‑separating fuel filter (in the boat) • Restriction in the fuel line through‑the‑hull fitting • Restriction in the fuel tank switching valves • Plugged fuel tank pick‑up screen High‑Pressure Fuel Pump The high‑pressure fuel pump and fuel lift pump are inside the fuel supply module. The high‑pressure fuel pump cannot be electrically tested separately from the fuel lift pump when installed as part of the fuel supply module assembly. The high‑pressure fuel pump can be tested for operation electrically with the CDS G3 diagnostic interface tool. There is no logic in the engine control module to know if the high‑pressure fuel pump is functioning or not. No fault will be set if the high‑pressure fuel pump fails. 1. Connect a fuel pressure gauge to the fuel rail Schrader valve. Fuel Pressure Gauge Kit 91‑881833A03 2. Perform the fuel pump load test with CDS G3. 3. The reading on the fuel pressure gauge should be within specifications. High‑Pressure Fuel Pump Fuel pressure, engine not running 340–370 kPa (49.3–53.7 psi) a b c d 4439 Troubleshooting and Diagnostics 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 7B-3
High‑Pressure Fuel Pump Fuel pressure, engine running at idle 290–340 kPa (42.1–43.9 psi) Fuel pressure, engine running under load Pressure dependent on manifold vacuum pressure, use calculation (refer to Fuel Pressure Calculations, Engine Running) 4. If there is little or no pressure reading on the gauge, ensure the fuel supply module has enough fuel to supply the high‑pressure fuel pump. It may be necessary to prime the fuel supply module to verify the system is purged of entrained air. Refer to the previous procedure to ensure that the fuel lift pump is operating properly. Fuel Pressure Calculations, Engine Running A simple formula can be used to determine what the approximate fuel pressure should be at different points in the engine RPM range: (MAP – Baro) + regulator set point. IMPORTANT: The actual regulator set point will vary according to engine fuel consumption. The actual fuel pressure may therefore fall anywhere within a 90 kPa (13.04 psi) range. In other words, fuel pressures calculated with this formula have a tolerance of ± 45 kPa (6.52 psi). The following examples assume an ambient barometric pressure of 98 kPa (14.21 psi) and an average fuel pressure set point of 363 kPa (52.65 psi). If CDS G3 displays a manifold absolute pressure of 38 kPa (5.51 psi), then: • kPa: (38 – 98) + 363 = 303. The calculated fuel pressure reading is 303 kPa; actual fuel pressure is 303 ± 45 kPa. • psi: (5.51 – 14.21) + 52.65 = 43.95. The calculated fuel pressure reading is 43.95 psi; actual fuel pressure is 43.95 ± 6.52 psi. Fuel Injector Resistance Test NOTE: A fuel injector test can be performed with the CDS G3 diagnostic interface tool. Use a digital ohmmeter to test the resistance of the fuel injector. NOTE: A resistance test can be performed while the fuel injector is mounted to the fuel rail. It is not necessary to remove the fuel injector from the fuel rail when checking the resistance of the fuel injector. The fuel injector is not polarity sensitive. Removed from fuel rail for clarity a - Fuel injector pins Fuel Injector Resistance at 21 °C (71 °F) 12.5 ± 0.6 Ω Wire Color Code Abbreviations Wire Color Abbreviations BLK Black BLU Blue BRN Brown GRA Gray GRN Green ORN Orange PNK Pink PPL Purple RED Red TAN Tan WHT White YEL Yellow LT Light DK Dark a Troubleshooting and Diagnostics Page 7B-4 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
Troubleshooting and Diagnostics Notes: 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 7B-5
Fuel Injector Circuits V6 Fuel Injector Circuits 104B 105A 105B 108B 109A 109B 106B 108A RED/BLU RED/WHT RED/WHT RED/PNK RED/ORN RED BLK PNK/BLU PNK/BLU PNK/RED PNK/RED PNK/ORN PNK/ORN BLK YEL/BLK YEL/BLK RED/BLU RED/WHT RED RED RED/PNK RED/ORN RED/ORN PNK/BRN PNK/BRN PNK PNK RED/ORN RED/ORN RED/ORN RED/ORN RED PNK/YEL YEL/PPL PNK/PPL PNK/PPL YEL/PPL PNK/YEL 20A 20A 20A A1 A2A3A4A5A6B1 B2B3B4B5B6C1 C2 C3 C4 C5 C6 A1 B1 C1 D1 E1 F1 G1H1 A2 B2 C2 D2 E2 F2 G2H2 A3 B3 C3 D3 E3 F3 G3H3 A4 B4 C4 D4 E4 H4 F4 G4 A B A B A B A B A B A B A B 30 85 86 87 30 85 86 87 308786 85 308786 85 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 A1 A2 A3 A4 A5 A6 C6 AB AB AB AB AB AB 86 30 87 85 87a 87 87a 86 85 30 RELAY KEY Relay Components as Viewed Separated Relay Connector A B C D E F G H 1 2 3 4 A B C D E F G H A H 4 1 A B 65385 1 3 5 2 4 6 7 8 9 10 11 12 13 Troubleshooting and Diagnostics Page 7B-6 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
1 - Fuel injector 1 2 - Fuel injector 2 3 - Fuel injector 3 4 - Fuel injector 4 5 - Fuel injector 5 6 - Fuel injector 6 7 - PCM connector A 8 - Fuel supply module 9 - Fuel pump relay 10 - Main power relay 11 - Hot stud 12 - Fuse holder ‑ three 20‑amp fuses shown 13 - Chassis ground Connector Pin Wire Color Function PCM 65694 A B A Red/orange Fused (20 A) 12 V power (+) – B Pink/brown Fuel injector 1 AF3 Pink/red Fuel injector 2 AD1 Pink/orange Fuel injector 3 AF4 Pink/yellow Fuel injector 4 AF1 Pink/blue Fuel injector 5 AE1 Pink/purple Fuel injector 6 AF2 A B 53172 A Pink Fuel pump 12 V power (+) – B Black Chassis ground (–) – 86 87 85 30 59637 30 Red/pink Fused (20 A) 12 V power (+) – 85 Yellow/black Fuel pump relay (FPR) control AB4 86 Red/blue Fused (20 A) 12 V power (+) – 87 Pink Fuel pump 12 V power (+) – Hot stud ring terminal 30 Red 12 V battery power (+) – MPR 86 Yellow/purple Main power relay (MPR) control signal AA2 MPR 87 Red/white Switched 12 V power (+) – Troubleshooting and Diagnostics 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 7B-7
V8 Fuel Injector Circuits 104B 105A 105B 108B 109A 109B 106B 108A RED/BLU RED/WHT RED/WHT RED/PNK RED/ORN RED BLK PNK/BLU PNK/BLU PNK/RED PNK/RED PNK/ORN PNK/ORN BLK YEL/BLK YEL/BLK RED/BLU RED/WHT RED RED RED/PNK RED/ORN RED/ORN PNK/BRN PNK/BRN PNK PNK RED/ORN RED/ORN RED/ORN RED/ORN PNK/WHT PNK/WHT PNK/LT GRN PNK/LT GRN RED/ORN RED/ORN RED PNK/YEL YEL/PPL PNK/PPL PNK/PPL YEL/PPL PNK/YEL 20A 20A 20A A1 A2A3A4A5A6B1 B2B3B4B5B6C1 C2 C3 C4 C5 C6 A1 B1 C1 D1 E1 F1 G1H1 A2 B2 C2 D2 E2 F2 G2H2 A3 B3 C3 D3 E3 F3 G3H3 A4 B4 C4 F4 G4D4 E4 H4 A B A B A B A B A B A B A B A B 30 85 86 87 30 85 86 87 A B 308786 85 308786 85 A B C D E F G H 1 2 3 4 A B C D E F G H A H 4 1 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 A1 A2 A3 A4 A5 A6 C6 AB AB AB AB AB AB AB AB 86 30 87 85 87a 87 87a 86 85 30 RELAY KEY Relay Components as Viewed Separated Relay Connector 1 3 5 7 2 4 6 8 9 10 11 12 13 14 15 65384 Troubleshooting and Diagnostics Page 7B-8 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
1 - Fuel injector 1 2 - Fuel injector 2 3 - Fuel injector 3 4 - Fuel injector 4 5 - Fuel injector 5 6 - Fuel injector 6 7 - Fuel injector 7 8 - Fuel injector 8 9 - PCM connector A 10 - Fuel supply module 11 - Fuel pump relay 12 - Main power relay 13 - Hot stud 14 - Fuse holder ‑ three 20‑amp fuses shown 15 - Chassis ground Connector Pin Wire Color Function PCM 65694 A B A Red/orange Fused (20 A) 12 V power (+) – B Pink/brown Fuel injector 1 AF3 Pink/red Fuel injector 2 AD1 Pink/orange Fuel injector 3 AF4 Pink/yellow Fuel injector 4 AF1 Pink/blue Fuel injector 5 AE1 Pink/purple Fuel injector 6 AF2 Pink/white Fuel injector 7 AC1 Pink/light green Fuel injector 8 AB1 A B 53172 A Pink Fuel pump 12 V power (+) – B Black Chassis ground (–) – 86 87 85 30 59637 30 Red/pink Fused (20 A) 12 V power (+) – 85 Yellow/black Fuel pump relay (FPR) control AB4 86 Red/blue Fused (20 A) 12 V power (+) – 87 Pink Fuel pump 12 V power (+) – Hot stud ring terminal – Red 12 V battery power (+) – MPR 86 Yellow/purple Main power relay (MPR) control signal AA2 MPR 87 Red/white Switched 12 V power (+) – Troubleshooting and Diagnostics 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 7B-9
Troubleshooting and Diagnostics Notes: Page 7B-10 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
Color Diagrams Section 8A - SmartCraft Circuit Diagrams Table of Contents 14‑Pin Data Harness ‑ DTS............................................... 8A-2 Wire Color Code Abbreviations..........................................8A-3 14‑Pin Data Harness ‑ Mechanical.................................... 8A-4 CAN Circuits ‑ DTS............................................................ 8A-6 CAN Circuits ‑ Mechanical................................................. 8A-7 Clean Power...................................................................... 8A-8 SmartCraft Circuit Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8A-1 8 A
14‑Pin Data Harness ‑ DTS a - PCM connector A b - PCM connector B c - PCM connector C d - CAN P and H terminator e - CAN X terminator f - 14‑pin connector g - Hot stud h - Engine fuses ‑ 15‑amp fuse i - Chassis ground d e f g h i c b a S104C S104B 109B 109A 102B S123 S122 PPL WHT BLU YEL BRN RED/PPL RED BLK BLK RED RED/BLK WHT BLK BLU RED/BLK BRN ORN/GRN GRN/ORN ORN/GRN GRN/ORN BLK 15A A1 A2A3A4A5A6B1 B2B3B4B5B6C1 C2 C3 C4 C5 C6 C1A1 H4 G1 H1 G2 H2 A1 M4 A B C D E F G H J K AB A B C D E F G H J K L M N P A1 D3 H4 N K J HG F E C B A D M L P B6 B5 B4 B3 B2 B1 C6 C5 C4 C3 C2 A6 A5 A4 A3 A2 C1A1 A B C D E F G H J K A B C D E F G H 1 2 3 4 A B C D E F G H A B C D E F G H J K A B C D E F G H J K 3 1 4 2 L M L M A B C D E F G H 1 2 3 4 A B C D E F G H M A 4 1 A H 1 4 H A 4 1 A B B A 65436 SmartCraft Circuit Diagrams Page 8A-2 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
Connector Pin Wire Color Function PCM 53467 A Red/black 12 V clean power (+) – B Black Clean power ground (–) – C Purple 12 V wake circuit (+) CC1 D Black/yellow E‑stop signal AD3 E Orange/green CAN H high – F White CAN P high BG2 G Blue CAN P low BG1 H Red/purple Fused (15 A) 12 V power (+) – J Black Chassis ground (–) – K Yellow CAN X high BH2 L Brown CAN X low BH1 M Gray Tachometer signal AA1 N N/A Not used – P Green/orange CAN H low – Hot stud ring terminal – Red 12 V battery power (+) – Wire Color Code Abbreviations Wire Color Abbreviations BLK Black BLU Blue BRN Brown GRA Gray GRN Green ORN Orange PNK Pink PPL Purple RED Red TAN Tan WHT White YEL Yellow LT Light DK Dark SmartCraft Circuit Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8A-3
14‑Pin Data Harness ‑ Mechanical S115 S114 102B S123 S107 S112 S122 PPL WHT BLU BRN ORN/GRN LT BLU/WHT GRN/WHT BLK RED/BLK BLK RED/BLK BRN BLU/YEL TAN/LT BLU YEL/RED YEL/RED WHT BLU LT BLU/WHT GRN/WHT TAN/LT BLU ORN/GRN PPL BLK/YEL BLU/YEL GRA GRA BLK/YEL H4 C1 D1A2 C2A3 C3 A1 G1 G2 L3M4 A1 A1 D3A4 H4 AB A B C D E F G H J K L M N P N K J HG F E C B A D M L P A B C D E F G H 1 2 3 4 A B C D E F G H A B C D E F G H J K A B C D E F G H J K 3 1 4 2 L M L M A B C D E F G H 1 2 3 4 A B C D E F G H M A 4 1 A H 1 4 H A 4 1 A B B A 65437 a b c d e SmartCraft Circuit Diagrams Page 8A-4 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
a - PCM connector A b - PCM connector B c - PCM connector C d - Clean power connector e - 14‑pin connector Connector Pin Wire Color Function PCM 53467 A Red/black 12 V clean power (+) – B Black Clean power ground (–) – C Purple 12 V wake circuit (+) CC1 D Black/yellow E‑stop signal AD3 E Blue/yellow Oil pressure analog gauge BL3 F White CAN P high BG2 G Blue CAN P low BG1 H Light blue/white Trim up command CC2 J Green/white Trim down command CC3 K Orange/green Trim position analog gauge CA3 L Tan/light blue Horn AA4 M Gray Tachometer signal AA1 N Yellow/red Start/stop signal CA2 P Brown Coolant temperature analog gauge CD1 SmartCraft Circuit Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8A-5
CAN Circuits ‑ DTS 102A 102B S123 S122 WHT BLU YEL BRN BLU BLU BRN ORN/GRN GRN/ORN ORN/GRN GRN/ORN WHT WHT BLK RED/BLK PPL PPL BRN BLK RED/BLK A B C D E F G H J K AB A B C D E F G H J K L M N P G1 H1 G2 H2 A1 M4 A1C1 H4 AB A B C D E F G H J K A B C D E F G H J K A B C D E F G H J K 3 1 4 2 L M L M M A 4 1 A B C D E F G H 1 2 3 4 A B C D E F G H A H 1 4 N K J HG F E C B A D M L P B A A B B A 65443 a b c e f d SmartCraft Circuit Diagrams Page 8A-6 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
a - CAN P/H terminator b - Clean power connector c - 14‑pin connector d - CAN X terminator e - PCM connector C f - PCM connector B Connector Pin Wire Color Function PCM E D C B A 57554 K J H G F A Red/black 12 V clean power (+) – B Black Clean power ground (–) – C N/A Not used – D N/A Not used – E Orange/green CAN H high – F Purple 12 V wake circuit (+) CC1 G Green/orange CAN H low – H N/A Not used J White CAN P high BG2 K Blue CAN P low BG1 A B 53172 A Yellow CAN X high BH2 B Brown CAN X low BH1 CAN Circuits ‑ Mechanical a - CAN P/H terminator b - Clean power connector c - 14‑pin connector d - CAN X terminator e - PCM connector C f - PCM connector B 102A 102B S123 S122 WHT BLU YEL BRN BLU BLU WHT WHT BLK RED/BLK PPL PPL BRN A B C D E F G H J K A B C D E F G H J K L M N P G1 H1 G2 H2 A1 M4 A1C1 H4 AB A B C D E F G H J K A B C D E F G H J K A B C D E F G H J K 3 1 4 2 L M L M M A 4 1 A B C D E F G H 1 2 3 4 A B C D E F G H A H 1 4 N K J HG F E C B A D M L P AB BLK RED/BLK B A A B B A 65444 a b c d e f SmartCraft Circuit Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8A-7
Connector Pin Wire Color Function PCM E D C B A 57554 K J H G F A Red/black 12 V clean power (+) – B Black Clean power ground (–) – C N/A Not used – D N/A Not used – E N/A Not used – F Purple 12 V wake circuit (+) CC1 G N/A Not used – H N/A Not used – J White CAN P high BG2 K Blue CAN P low BG1 A B 53172 A Yellow CAN X high BH2 B Brown CAN X low BH1 Clean Power DTS models a - CAN P/H terminator b - Clean power connector c - 14‑pin connector d - PCM connector C RED/BLK BLK RED/BLK BLK RED/BLK BLK RED/BLK A B C D E F G H J K A B C D E F G H J K L M N P H4A4 A1 AB A B C D E F G H J K N K J HG F E C B A D M L P A B B A 65446 a b c d A B C D E F G H 1 2 3 4 A B C D E F G H A H 1 4 SmartCraft Circuit Diagrams Page 8A-8 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
Mechanical models a - CAN P/H terminator b - Clean power connector c - 14‑pin connector d - Trim harness connector e - Cowl trim switch connector f - PCM connector C Connector Pin Wire Color Function PCM 65743 B A A Red/black 12 V clean power (+) CA4 B Black Clean power ground (–) – S114B RED/BLK BLK RED/BLK BLK RED/BLK RED/BLK RED/BLK BLK RED/BLK A B C D E F G H J K A B C D E F G H J K L M N P A BC 3 2 H4 1 A4 A1 AB A B C D E F G H J K N K J HG F E C B A D M L P A B C D E F G H 1 2 3 4 A B C D E F G H A H 1 4 1 2 3 B C A A B B A 65447 a b c d e f 1 SmartCraft Circuit Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8A-9
SmartCraft Circuit Diagrams Notes: Page 8A-10 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
Color Diagrams Section 8B - Engine Harness Diagrams Table of Contents 4.6L V8 DTS Wiring Diagram.............................................8B-4 4.6L V8 Non‑DTS Wiring Diagram.....................................8B-5 3.4L V6 DTS Wiring Diagram.............................................8B-6 3.4L V6 Non‑DTS Wiring Diagram.....................................8B-7 Engine Harness Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8B-1 8 B
Notes: Engine Harness Diagrams Page 8B-2 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
Notes: Engine Harness Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8B-3
4.6L V8 DTS Wiring Diagram 1 - Propulsion control module (PCM) connector A 2 - Crankshaft position sensor (CPS) 3 - Power steering 4 - O2 sensor 5 - Fuel injector 6 6 - Fuel injector 8 7 - Fuel injector 4 8 - Fuel injector 3 9 - Fuel injector 2 10 - Fuel injector 1 11 - Fuel injector 7 12 - Fuel injector 5 13 - Fuel pump 14 - Fuel pump relay 15 - CAN P and CAN H terminator (SmartCraft connector) 16 - Clean power harness 17 - 14‑pin data harness 18 - 2‑pin CAN X terminator 19 - Start relay 20 - Main power relay (MPR) 21 - Starter solenoid 22 - Hot stud (+) 23 - Alternator 24 - Electronic throttle control (ETC) 25 - Engine fuses 26 - Oil level sensor 27 - Oil temperature sensor 28 - Trim sensor 29 - Pitot pressure 30 - Oil pressure sensor 31 - Boat harness 32 - Engine block pressure sensor 33 - Manifold absolute pressure (MAP) sensor 34 - Camshaft position sensor 35 - Ignition coil harness 36 - Exhaust gas temperature (EGT) sensor 37 - Moving propeller (MP) alert 38 - Depth transducer connector 39 - Water‑in‑fuel sensor 40 - Intake air temperature (IAT) sensor 41 - Shift actuator 42 - Trim harness 43 - Chassis ground (–) 44 - Advanced sound control actuator—used on AMS models only 45 - Cowl trim switch 46 - Analog gauge harness 47 - Engine coolant temperature (ECT) sensor 48 - PCM ground (–) 49 - PCM connector C 50 - PCM connector B Engine Harness Diagrams Page 8B-4 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
4.6L V8 DTS Wiring Diagram Page 8B-4.1 8M0182076 108A 106A 108B BLK/WHT BLK/WHT RED/BLU TAN/ORN PPL/YEL LT BLU/BLK PPL WHT/GRN GRA/BLU PNK/BLK BLK/ORN RED/BLK WHT BLU LT GRN/ORN RED/BLU BRN/WHT BRN/BLK ORN/WHT TAN/GRN PPL/BLK BLK/GRN YEL BRN BLK/RED WHT/YEL BLU/RED GRN BLK RED/PPL WHT/GRA WHT/PPL BLU/YEL BRN ORN/GRN RED/WHT TAN/PPL YEL TAN WHT/ORN TAN/BLK PNK LT BLU/WHT GRN/WHT GRN/WHT YEL WHT/BLK BRN TAN/LT BLU GRN PNK/BLU PNK/RED PNK/ORN PNK/RED BLU/WHT WHT/BLU PNK/ORN YEL/BLK GRN/BRN RED/ORN PNK/BRN BLK/BLU LT GRN/ORN ORN/WHT TAN/GRN BLK/WHT GRN/RED RED/ORN RED/ORN RED/ORN PNK/WHT PNK/LT GRN PNK/LT GRN RED/ORN RED RED WHT WHT BLK WHT/BLU BLU/RED WHT/BLU LT BLU/WHT ORN ORN/WHT LT BLU A1 B1 C1 D1 E1 F1 G1 H1 A2 B2 C2 D2 E2 F2 G2 H2 A3 D3 E3 G3 B3 C3 F3 H3 A4 B4 C4 F4 G4 D4 E4 H4 A1 B1 C1 D1 E1 F1 G1 H1 J1 K1 L1 M1 A2 B2 C2 D2 E2 F2 G2 H2 J2 K2 L2 M2 A3 B3 C3 D3 E3 F3 H3 J3 K3 L3 G3 A4 B4 C4 D4 E4 F4 H4 J4 L4 G4 K4 M4 A1B1 C1 D1 E1 F1 G1H1A2 B2 C2 D2 E2 F2 G2H2 A3 B3 C3 D3 E3 F3 G3H3 A4 B4 C4 D4 E4 F4 G4H4 1 2 A B C 1 2 3 4 5 6 A B A B A B A B A B A B C D E F G H 4 2 1 3 A H 41 A B C D E F G H ABCDEFGH 2 4 1 3 HA 1 4ABCDEFGH A B C A B A B A B A B A B 2 4 6 1 3 5 ABCDEFGHJK ABCDEFGHJK 3 1 4 2 L M M L AM 4 1 5 6 7 8 9 4 3 2 1 49 50
63904 125A 100C 100A 100B S104C S104B 105A 105B 105C 109B 109A 106B 102B 124A 124B S101 102A S123 S122 BLU/WHT WHT/BLU BLK/WHT BLK/WHT BLK RED/BLU GRN/BRN TAN/ORN PPL/YEL PPL/BLK PPL/YEL LT BLU/BLK RED/ORN RED/ORN WHT/GRN GRA/BLU PNK/BLK BLK/GRN BLK/ORN BLK/ORN RED/WHT RED/WHT RED/PNK RED/ORN RED BRN/WHT BLK/ORN BRN/BLK BLK/ORN RED/WHT ORN/WHT RED/WHT RED/WHT BLK/WHT BLK/RED WHT/YEL BLU/RED BLK GRN BLK/ORN RED/PPL RED GRN/RED RED/WHT RED/YEL BRN ORN/GRN RED/WHT BLK/ORN BLK/GRN YEL PPL/BLK TAN BLK/ORN BLU/RED BLK BLK/GRN PPL/BLK PPL RED TAN/BLK BLK/GRN L PNK T BLU/WHT LT BLU/WHT GRN/WHT GRN/WHT RED RED YEL PPL/BLK BLK/GRN PPL/BLK ORN WHT/BLK ORN/GRA BLK BRN BLK/ORN BLK/ORN TAN/LT BLU GRN A B C WHT/ORN BLK BLK/ORN LT BLU WHT BLU PNK/BLU BLK RED/BLU BLK YEL/BLK RED/BLU RED/WHT RED RED RED RED/PNK RED/BLK RED/ORN PNK/BRN YEL/RED YEL/RED PNK PNK BLK/BLU WHT BLK BLU BLK RED/BLK BRN BRN ORN/GRN GRN/ORN ORN/GRN GRN/ORN BLK PNK/WHT RED/ORN RED/ORN RED/BLK RED PPL/YEL 20A 10A 2A 15A 20A 5A 20A 20A A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6ABCABC A B 1 2 3 4 1 2 3 C B A 1 2 3 4 5 6 A B A B C D A B C A B A B C D E C B A ABCDEFABC1234ABABCDE123456ABCD A B A B A B B A 30858687 A B C D E F G H J K A B C D E F G H J K L M N P B A 30858687 30858687 ABC B A B A 1 2 3 4 BA C A B C B A 1 2 3 A B C B A 87 30 85 86 87 30 85 86 87 30 85 86 A B C D E F G H J K 86 30 87 85 87a 87 87a 86 85 30 RELAY KEY Relay Components as Viewed Separated Relay Connector 1 2 3 4 A B A B A B A B A B C D C BA C BA C BA D E F C B A 1 6 2 5 3 4 1 32 4 6 1 2 3 4 5 1 2 3 4 ABDEC A B B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 A1 A2 A3 A4 A5 A6 C6 25 4 3 2 1 1 2 3 48 47 46 45 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 24 23 21 22 17 18 19 20 16 15 13 14 1 1 12 44 10
4.6L V8 Non-DTS Wiring Diagram Page 8B-5.1 8M0182076 S116 108A 106A 108B 118A BLK/WHT BLK/WHT RED/BLU TAN/ORN PPL/YEL LT BLU/BLK PPL WHT/GRN GRA/BLU PNK/BLK BLK/ORN RED/BLK WHT BLU LT GRN/ORN RED/BLU BRN/WHT BRN/BLK ORN/WHT TAN/GRN PPL/BLK BLK/GRN YEL BRN BLK/RED WHT/YEL BLU/RED GRN BLK RED/PPL WHT/GRA WHT/PPL BRN ORN/GRN RED/WHT TAN/PPL YEL TAN WHT/ORN TAN/BLK PNK LT BLU/WHT GRN/WHT GRN/WHT YEL BLK/PNK WHT/BLK BRN TAN/LT BLU GRN PNK/BLU PNK/RED PNK/ORN PNK/RED BLU/WHT WHT/BLU PNK/ORN YEL/BLK GRN/BRN RED/ORN PNK/BRN BLK/BLU LT GRN/ORN ORN/WHT TAN/GRN BLK/WHT GRN/RED RED/ORN RED/ORN RED/ORN PNK/WHT PNK/LT GRN PNK/LT GRN RED/ORN RED RED WHT WHT BLK WHT/BLU WHT/BLU BLU/RED LT BLU/WHT ORN ORN/WHT LT BLU PPL/GRN GRA/GRN PPL/GRN BLK/PNK GRA/GRN GRA/WHT PPL/GRN BLK/PNK BLU/PNK BLU/YEL BLU/BLK BLK/ORN TAN/LT BLU YEL/RED GRA/WHT PNK/YEL GRN/YEL YEL/PPL PNK/PPL GRN/PPL BLK/YEL PPL WHT/GRA WHT/PPL PNK/PPL PPL/YEL GRA PNK/YEL A1 B1 C1 D1 E1 F1 G1 H1 A2 B2 C2 D2 E2 F2 G2 H2 A3 D3 E3 G3 B3 C3 F3 H3 A4 B4 C4 F4 G4 D4 E4 H4 A1 B1 C1 D1 E1 F1 G1 H1 J1 K1 L1 M1 A2 B2 C2 D2 E2 F2 G2 H2 J2 K2 L2 M2 A3 B3 C3 D3 E3 F3 H3 J3 K3 L3 G3 A4 B4 C4 D4 E4 F4 H4 J4 L4 G4 K4 M4 A1B1 C1 D1 E1 F1 G1H1A2 B2 C2 D2 E2 F2 G2H2 A3 B3 C3 D3 E3 F3 G3H3 A4 B4 C4 D4 E4 F4 G4H4 1 2 A B C 1 2 3 4 5 6 A B A B A B A B A B A B C D E F A B A B C D E F G H 4 2 1 3 A H 41 A B C D E F G H F A F E D A B C A B A B A B A B A B ABCDEFGH 2 4 1 3 HA 1 4ABCDEFGH 2 4 6 1 3 5 ABCDEFGHJK ABCDEFGHJK 3 1 4 2 L M M L AM 4 1 A B C 5 6 7 8 9 4 3 2 1 50 51 49
63971 S115 125A 100C 100A 100B 104B S114A 105A 105B 105C 109B 109A 106B S101 102B 124A 124B 101A 102A S123 S107 S114B S122 S112 BLU/WHT WHT/BLU BLK/WHT BLK/WHT BLK RED/BLU GRN/BRN TAN/ORN PPL/YEL PPL/BLK PPL/YEL LT BLU/BLK RED/ORN RED/ORN WHT/GRN GRA/BLU PNK/BLK BLK/GRN BLK/ORN BLK/ORN RED/WHT RED/WHT RED/PNK RED/ORN RED BRN/WHT BLK/ORN BRN/BLK BLK/ORN RED/WHT ORN/WHT RED/WHT RED/WHT BLK/WHT BLK/RED WHT/YEL BLU/RED BLK GRN BLK/ORN GRN/RED RED/WHT RED/YEL BLK/ORN RED/WHT BLK/ORN BLK/GRN YEL PPL/BLK TAN BLK/ORN BLU/RED BLK BLK/GRN PPL/BLK PPL RED TAN/BLK BLK/GRN L PNK T BLU/WHT LT BLU/WHT GRN/WHT GRN/WHT RED/BLK RED/BLK YEL PPL/BLK BLK/GRN PPL/BLK ORN WHT/BLK ORN/GRA BLK BRN BLK/ORN BLK/ORN TAN/LT BLU GRN WHT/ORN BLK BLK/ORN LT BLU WHT BLU PNK/BLU BLK RED/BLU BLK YEL/BLK RED/BLU RED/WHT RED RED RED RED/PNK RED/BLK RED/ORN PNK/BRN YEL/RED YEL/RED PNK PNK BLK/BLU BLK BLK RED/BLK BRN BRN PNK/WHT RED/ORN RED/ORN RED/BLK RED BLU/BLK BLU/PNK YEL/RED WHT BLU LT BLU/WHT GRN/WHT TAN/LT BLU ORN/GRN PPL PPL BLK/YEL BLU/YEL YEL YEL/PPL PPL/YEL RED/YEL PPL/YEL GRN/YEL GRN/PPL PPL TAN/PPL PPL/YEL RED/PPL ORN/GRA PPL/YEL GRA C B A 20A 10A 2A 20A 5A 20A 20A A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6ABCABC A B 1 2 3 1 2 3 4 5 6 A B A B C D A B C A B A B C D E ABCDEFABC1234ABCDE123456 A B A B A B B A 30858687 A B C D E F G H J K A B C D E F G H J K L M N P B A 30858687 30858687 C D E F ABCD C B A ABABC B A B A 1 2 3 1 2 3 4 C B A 1 2 3 4 BA C A B 87 30 85 86 87 30 85 86 87 30 85 86 A B C D E F G H J K 86 30 87 85 87a 87 87a 86 85 30 RELAY KEY Relay Components as Viewed Separated Relay Connector F E D A B C A B A B A B B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 A1 A2 A3 A4 A5 C6 A6 C BA C BA C BA D E F C B A 1 6 2 5 3 4 B A A B C D ABDEC1 2 3 4 A B C 4 1 A B 3 2 2 3 47 46 45 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 21 22 17 18 19 20 16 15 13 14 1 1 12 44 10 48
4.6L V8 Non-DTS Wiring Diagram 1 - Propulsion control module (PCM) connector A 2 - Crankshaft position sensor (CPS) 3 - Power steering 4 - O2 sensor 5 - Fuel injector 6 6 - Fuel injector 8 7 - Fuel injector 4 8 - Fuel injector 3 9 - Fuel injector 2 10 - Fuel injector 1 11 - Fuel injector 7 12 - Fuel injector 5 13 - Fuel pump 14 - Fuel pump relay 15 - CAN P and CAN H terminator (SmartCraft connector) 16 - Clean power harness 17 - 14‑pin data harness 18 - 2‑pin CAN X terminator 19 - Start relay 20 - Main power relay (MPR) 21 - Starter solenoid 22 - Hot stud (+) 23 - Alternator 24 - Electronic throttle control (ETC) 25 - Engine fuses 26 - Oil level sensor 27 - Oil temperature sensor 28 - Trim sensor 29 - Pitot pressure 30 - Oil pressure sensor 31 - Boat harness 32 - Engine block pressure sensor 33 - Manifold absolute pressure (MAP) sensor 34 - Camshaft position sensor 35 - Ignition coil harness 36 - Exhaust gas temperature (EGT) sensor 37 - Moving propeller (MP) alert 38 - Depth transducer connector 39 - Water‑in‑fuel sensor 40 - Intake air temperature (IAT) sensor 41 - Shift actuator 42 - Trim harness 43 - Chassis ground (–) 44 - Advanced sound control actuator—used on AMS models only 45 - Cowl trim switch 46 - Engine coolant temperature (ECT) sensor 47 - PCM ground (–) 48 - Shift demand sensor 49 - Throttle demand sensor 50 - PCM connector C 51 - PCM connector B Engine Harness Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8B-5
3.4L V6 DTS Wiring Diagram 1 - Propulsion control module (PCM) connector A 2 - Crankshaft position sensor (CPS) 3 - Power steering 4 - O2 sensor 5 - Fuel injector 6 6 - Fuel injector 4 7 - Fuel injector 3 8 - Fuel injector 2 9 - Fuel injector 1 10 - Fuel injector 5 11 - Fuel pump 12 - Fuel pump relay 13 - CAN P and CAN H terminator (SmartCraft connector) 14 - Clean power harness 15 - 14‑pin data harness 16 - 2‑pin CAN X terminator 17 - Start relay 18 - Main power relay (MPR) 19 - Starter solenoid 20 - Hot stud (+) 21 - Alternator 22 - Electronic throttle control (ETC) 23 - Engine fuses 24 - Oil level sensor 25 - Oil temperature sensor 26 - Trim sensor 27 - Pitot pressure 28 - Oil pressure sensor 29 - Boat harness 30 - Engine block pressure sensor 31 - Manifold absolute pressure (MAP) sensor 32 - Camshaft position sensor 33 - Ignition coil harness 34 - Exhaust gas temperature (EGT) sensor 35 - Moving propeller (MP) alert 36 - Depth transducer connector 37 - Water‑in‑fuel sensor 38 - Intake air temperature (IAT) sensor 39 - Shift actuator 40 - Trim harness 41 - Chassis ground (–) 42 - Cowl trim switch 43 - Analog gauge harness 44 - Exhaust coolant temperature (ECT) sensor 45 - PCM ground (–) 46 - PCM connector C 47 - PCM connector B Engine Harness Diagrams Page 8B-6 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
108B 108A 106A A1 B1 C1 D1 E1 F1 G1 H1 A2 B2 C2 D2 E2 F2 G2 H2 A3 D3 E3 G3 B3 C3 F3 H3 A4 B4 C4 F4 G4 D4 E4 H4 A1 B1 C1 D1 E1 F1 G1 H1 J1 K1 L1 M1 A2 B2 C2 D2 E2 F2 G2 H2 J2 K2 L2 M2 A3 B3 C3 D3 E3 F3 H3 J3 K3 L3 G3 A4 B4 C4 D4 E4 F4 H4 J4 L4 G4 K4 M4 A1B1 C1 D1 E1 F1 G1H1A2 B2 C2 D2 E2 F2 G2H2 A3 B3 C3 D3 E3 F3 G3H3 A4 B4 C4 D4 E4 F4 G4H4 1 2 A B C 1 2 3 4 5 6 A B A B A B A B LT PNK/BLU GRN/ORN PNK/RED BLU/WHT WHT/BLU PNK/ORN YEL/BLK PNK/BRN GRN/BRN BLK/BLU BLK/WHT GRN/RED RED WHT BLU/RED WHT/BLU LT BLU/WHT ORN BLK/WHT BLK/WHT RED/BLU TAN/ORN PPL/YEL LT BLU/BLK PPL WHT/GRN GRA/BLU PNK/BLK BLK/ORN RED/BLK WHT BLU LT GRN/ORN RED/BLU BRN/WHT BRN/BLK ORN/WHT TAN/GRN PPL/BLK BLK/GRN YEL BRN BLK/RED WHT/YEL BLU/RED GRN BLK RED/PPL WHT/GRA WHT/PPL BLU/YEL BRN ORN/GRN RED/WHT TAN/PPL YEL TAN WHT/ORN TAN/BLK PNK LT BLU/WHT GRN/WHT GRN/WHT YEL BRN TAN/LT BLU LT BLU PNK/ORN PNK/RED RED/ORN ORN/WHT TAN/GRN RED/ORN RED/ORN RED/ORN RED WHT BLK WHT/BLU ORN/WHT HA ABCDEFGH 2 4 1 3 1 4ABCDEFGH A B C D E F G H 4 2 1 3 A H 41 A B C D E F G H 2 4 6 1 3 5 ABCDEFGHJK ABCDEFGHJK 3 1 4 2 L M M L AM 4 1 A B A B A B A B 2 4 6 1 3 5 A B C 1 2 3 4 5 6 7 8 46 47 3.4L V6 DTS Wiring Diagram Page 8B-6.1 8M0182076
125A 100C 100A 100B S104C S104B 105A 105B 109B 109A 106B 105C 124A 124B S101 S123 S122 102A 102B A B 1 2 3 4 1 2 3 C B A 1 2 3 4 5 6 B A A B A B C D A B C A B A B C D E C B A 20A 10A 2A 15A 20A 20A 20A A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6ABCABCABCDEFABC1234ABCDE123456ABCDAB A B A B B A 30858687 A B C D E F G H J K B A A B C D E F G H J K L M N P B A 30858687 30858687 ABC BLK/WHT BLK/WHT BLK/WHT BLK/ORN BRN/BLK BRN ORN/GRN BLK GRN BLK/ORN BLK BLU/WHT WHT/BLU RED/ORN BLK/ORN BRN/WHT GRN/BRN GRN/RED BLK/ORN RED/WHT TAN L PNK BLK/ORN BLU/RED BLK T BLU/WHT LT BLU/WHT RED GRN/WHT BLK GRN/WHT RED BLK/ORN BLK/GRN YEL PPL/BLK TAN/ORN PPL/YEL PPL/BLK WHT/GRN GRA/BLU PNK/BLK BLK/GRN BLK/ORN BLK/GRN PPL/BLK YEL PPL/BLK BLK/GRN BRN BLK/ORN WHT/ORN BLK/ORN LT BLU RED/BLU PPL/YEL LT BLU/BLK RED/ORN BLK/ORN RED/WHT RED/WHT RED/PNK RED/ORN RED ORN/WHT RED/WHT RED/WHT BLK/RED WHT/YEL BLU/RED RED/PPL RED RED/WHT RED/YEL PPL RED TAN/BLK BLK/GRN PPL/BLK ORN WHT BLU PNK/BLU BLK RED/BLU BLK YEL/BLK RED/BLU RED/WHT RED RED RED RED/PNK RED/BLK RED/ORN PNK/BRN YEL/RED YEL/RED PNK PNK BLK/BLU WHT BLK BLU BLK RED/BLK BRN BRN ORN/GRN GRN/ORN ORN/GRN GRN/ORN BLK RED/ORN RED/BLK RED TAN/LT BLU PPL/YEL 86 30 87 85 87a 87 87a 86 85 30 RELAY KEY Relay Components as Viewed Separated Relay Connector 87 30 85 86 87 30 85 86 87 30 85 86 A B C D E F G H J K BA C A B A B A B C BA C BA C BA D E F C B A 1 6 2 5 3 4 1 32 4 A B B A 13 A B C D 1 2 3 C B A ABDEC1 2 3 4 A B C B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 A1 A2 A3 A4 A5 A6 C6 2 3 23 9 10 1 1 12 13 14 15 16 17 18 19 20 21 22 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 43 44 45 42 65289
108B 108A 106A S118 118A A1 B1 C1 D1 E1 F1 G1 H1 A2 B2 C2 D2 E2 F2 G2 H2 A3 D3 E3 G3 B3 C3 F3 H3 A4 B4 C4 F4 G4 D4 E4 H4 A1 B1 C1 D1 E1 F1 G1 H1 J1 K1 L1 M1 A2 B2 C2 D2 E2 F2 G2 H2 J2 K2 L2 M2 A3 B3 C3 D3 E3 F3 H3 J3 K3 L3 G3 A4 B4 C4 D4 E4 F4 H4 J4 L4 G4 K4 M4 A1B1 C1 D1 E1 F1 G1H1A2 B2 C2 D2 E2 F2 G2H2 A3 B3 C3 D3 E3 F3 G3H3 A4 B4 C4 D4 E4 F4 G4H4 1 2 A B C 1 2 3 4 5 6 A B A B A B A B A B C D E F A B LT PNK/BLU GRN/ORN PNK/RED BLU/WHT WHT/BLU PNK/ORN YEL/BLK PNK/BRN GRN/BRN BLK/BLU BLK/WHT GRN/RED RED WHT BLU/RED WHT/BLU LT BLU/WHT ORN BLK/WHT BLK/WHT RED/BLU TAN/ORN PPL/YEL LT BLU/BLK PPL WHT/GRN GRA/BLU PNK/BLK BLK/ORN RED/BLK WHT BLU LT GRN/ORN RED/BLU BRN/WHT BRN/BLK ORN/WHT TAN/GRN PPL/BLK BLK/GRN YEL BRN BLK/RED WHT/YEL BLU/RED GRN BLK RED/PPL WHT/GRA WHT/PPL BLU/YEL BRN ORN/GRN RED/WHT TAN/PPL YEL TAN WHT/ORN TAN/BLK PNK LT BLU/WHT GRN/WHT GRN/WHT YEL BRN TAN/LT BLU LT BLU PNK/ORN PNK/RED RED/ORN ORN/WHT TAN/GRN RED/ORN RED/ORN RED/ORN RED WHT BLK WHT/BLU ORN/WHT YEL/RED PPL/GRN BLK/PNK GRA/GRN GRA/WHT BLK/ORN PPL/YEL PPL/GRN BLK/PNK GRA/WHT BLU/PNK GRA/GRN BLU/BLK BLK/PNK PPL/GRN TAN/LT BLU ABCDEFGHJK ABCDEFGHJK 1 3 2 4 AM LM ML 1 4ABCDEFGH 4 2 3 1 HA 4 1 ABCDEFGH A B C D E F G H 4 2 1 3 A H 41 A B C D E F G H C B A 2 4 6 1 3 5 A B A B A B A B F E D A B C 1 2 3 4 5 6 7 8 46 47 48 200/225 3.4L V6 Non-DTS Wiring Diagram Page 8B-7.1 8M0182076
125A 100A 100B S104C S104B 105A 105B 109B 109A 106B 105C 124A 124B S101 S123 S122 102A 102B 101B 100C S112 A B C A B 1 2 3 A B C 1 2 3 4 5 6 A B A B A B C D A B C A B A B C D E A B C 20A 10A 2A 15A 20A 20A 20A A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6ABCABCABCABCDEFABC1234ABABCDE123456ABCD A B A B A B 30858687 A B C D E F G H J K A B A B C D E F G H J K L M N P A B 30858687 30858687 B C D E F BLK/WHT BLK/WHT BLK/WHT BLK/ORN BRN/BLK BLK GRN BLK/ORN BLK BLU/WHT WHT/BLU RED/ORN BLK/ORN BRN/WHT GRN/BRN GRN/RED RED/WHT BLK/ORN TAN L PNK BLK/ORN BLU/RED BLK T BLU/WHT LT BLU/WHT RED GRN/WHT BLK RED GRN/WHT BLK/ORN BLK/GRN YEL PPL/BLK TAN/ORN PPL/YEL PPL/BLK WHT/GRN GRA/BLU PNK/BLK BLK/GRN BLK/ORN BLK/GRN PPL/BLK YEL PPL/BLK BLK/GRN BRN BLK/ORN WHT/ORN BLK/ORN LT BLU RED/BLU PPL/YEL LT BLU/BLK RED/ORN BLK/ORN RED/WHT RED/WHT RED/PNK RED/ORN RED ORN/WHT RED/WHT RED/WHT BLK/RED WHT/YEL BLU/RED RED/WHT RED/YEL PPL RED TAN/BLK BLK/GRN PPL/BLK ORN WHT BLU PNK/BLU BLK RED/BLU BLK YEL/BLK RED/BLU RED/WHT RED RED RED RED/PNK RED/BLK RED/ORN PNK/BRN YEL/RED YEL/RED PNK PNK BLK/BLU WHT BLK BLU BLK RED/BLK TAN/LT BLU BRN BRN BLU/YEL RED/ORN GRN/WHT RED/BLK RED TAN/LT BLU YEL/RED BLK/PNK BLU/BLK BLU/PNK BLK/ORN PPL/YEL LT BLU/WHT ORN/GRN PPL/YEL 86 30 87 85 87a 87 87a 86 85 30 RELAY KEY Relay Components as Viewed Separated Relay Connector A B 87 30 85 86 87 30 85 86 E H J K M L N A B C D F G P A B 87 30 85 86 A B C D E F G H J K A B A B A B C B A E D A B C B A C D C B A AB A B C 3 2 1 ABDEC B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 A1 A2 A3 A4 A5 C6 A6 A B C D C B A C B A C B A D E F C B A A B C 1 2 3 4 65 1 4 23 F E D A B C 3 2 1 9 10 1 1 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 65302
3.4L V6 Non-DTS Wiring Diagram 1 - Propulsion control module (PCM) connector A 2 - Crankshaft position sensor (CPS) 3 - Power steering 4 - O2 sensor 5 - Fuel injector 6 6 - Fuel injector 4 7 - Fuel injector 3 8 - Fuel injector 2 9 - Fuel injector 1 10 - Fuel injector 5 11 - Fuel pump 12 - Fuel pump relay 13 - CAN P and CAN H terminator (SmartCraft connector) 14 - Clean power harness 15 - 14‑pin data harness 16 - 2‑pin CAN X terminator 17 - Start relay 18 - Main power relay (MPR) 19 - Starter solenoid 20 - Hot stud (+) 21 - Alternator 22 - Electronic throttle control (ETC) 23 - Engine fuses 24 - Oil level sensor 25 - Oil temperature sensor 26 - Trim sender 27 - Pitot pressure sensor 28 - Oil pressure sensor 29 - Boat harness 30 - Engine block pressure sensor 31 - Manifold absolute pressure (MAP) sensor 32 - Camshaft position sensor 33 - Ignition coil harness 34 - Exhaust gas temperature (EGT) sensor 35 - Moving propeller (MP) alert 36 - Depth transducer connector 37 - Water‑in‑fuel sensor 38 - Intake air temperature (IAT) sensor 39 - Shift actuator 40 - Trim harness 41 - Chassis ground (–) 42 - Cowl trim switch 43 - Engine coolant temperature (ECT) sensor 44 - PCM ground (–) 45 - Shift demand sensor 46 - Throttle demand sensor 47 - PCM connector C 48 - PCM connector B Engine Harness Diagrams 90- 8M0182076 eng NOVEMBER 2021 © 2022 Mercury Marine Page 8B-7
Engine Harness Diagrams Notes: Page 8B-8 © 2022 Mercury Marine 90- 8M0182076 eng NOVEMBER 2021
DIAGNOSTIC MANUAL V6 175 /200 /225 V8 200 /225 /250 /300 FourStroke Outboard www.brunswick-marine.com Parc Industriel de Petit-Rechain B-4800 Verviers, Belgium 90-8M0182076 NOVEMBER 2021 90-8M0182076 NOVEMBER 2021 www.mercurymarine.com.au 41-71 Bessemer Drive Dandenong South, Victoria 3175 Australia www.mercurymarine.com P.O. Box 1939 Fond du Lac, WI 54936-1939 USA © Mercury Marine. All rights reserved. Printed in U.S.A. DIAGNOSTIC MANUAL V6 175/200/225 V8 200/225/250/300 FourStroke Outboard Starting serial number 2B529482