Service Manual 5007215_Evinrude E-TEC 200-250 HP System Analysis [Ground Circuits]

All ground circuits are essential to optimum out board performance. Make certain all ground connections are clean and tight. Refer to wiring diagrams to identify specific wiring details.

Disconnect the battery cables at the battery.

Use an ohmmeter to check grounds at the appropriate pin locations of the EMM. Calibrate the ohmmeter on the “high” ohms scale.

Connect the ohmmeter red lead to the ground wire and the black meter lead main harness ground. Resistance readings for all ground circuits should be 0 Ω.

Main engine harness grounds to:

• Injector circuits: check continuity to terminal pins 9 and 27 of the EMM J2 connector and to terminal pins 9, 10, 15, 16 and 22 of the EMM J1-B connector.
• Ignition circuit: check continuity to terminal pin 17, 18, 24 of the EMM J1-B connector.
• Power supply / battery: check continuity to terminal pins 4, 5, 14, 15, 16, 23, 24 and 25 of EMM J2 connector.
• Trim and Tilt module: check connection at main ground terminal.

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

• Ignition (pins 17, 18 and 24 of the EMM J1-B connector), injector and EMM battery grounds on port and starboard cylinder head ground screws.

1. Ground, starboard cylinder head

The engine harness 12 V (B+) circuit is protected by one automotive style 10 amp minifuse. The fuse is positioned on the starboard side of power head, and fastened to the capacitor.

1. Fuse