Service Manual 200-250 HP 3.3 L E-TEC Electrical And Ignition [Ground Circuits]

All ground circuits are essential to reliable outboard performance. Make sure all ground connections are clean and tight. Refer to wiring diagrams for specific wiring details.

EMM Ground Tests

Disconnect the battery cables at the battery.

Use an ohmmeter to check continuity of ground circuits. Calibrate the ohmmeter on the high ohms scale. Resistance readings for all ground circuits should be 0 Ω.

• System/power supply grounds: Check continuity between terminal pins 4, 5, 9, 14, 15, 16, 23, 24, 25 and 27 of EMM J2 connector and the main harness ground.
• Injector circuit grounds: Check continuity between terminal pins 9 and 27 of the EMM J2 connector and the main harness ground; and between terminal pins 9, 10, 15, 16 and 22 of the EMM J1-B connector and the main harness ground.
• Ignition circuit grounds: Check continuity between terminal pins 17, 18, and 24 of the EMM J1-B connector and port and starboard cylinder head ground screws.
• Sensor circuit grounds: Check continuity between terminal pins 4 and 11 of the EMM J1-A connector and the appropriate sensor ground connections. Refer to wiring diagrams.

1. Main engine harness ground
2. Ground stud (battery)

Additional Ground Tests

Check connections and continuity at the following locations:

• Trim and Tilt module ground at main ground terminal.
• CPS connector pin 3 and main harness ground.
• Check continuity between ground terminals at port and starboard cylinder head ground screws and the main harness ground.

1. Ground, starboard cylinder head

The engine harness 12 V (B+) circuit is protected by one automotive style 10 amp minifuse.

The fuse is located on the starboard side of the powerhead, and fastened to the capacitor.

1. Fuse

Repeat failures of fuse could be the result of faulty connections or accessories. The 12 V accessory circuit (purple wire from terminal “A” of key switch) is often used to power acccessories.