Checking Power and Ground Terminals

Checking Power Supply and Ground Terminal, Engine Control Module (ECM)







Checking the power supply
- Check fuse 11 the integrated relay/fusebox in the passenger compartment. If the fuse is blown, check the circuit after the fuse for a short-circuit to ground according to Checking wiring and terminals - Permanent faults
- Check fuse 13 the integrated relay/fusebox in the engine compartment. If the fuse is blown, check the circuit after the fuse for a short-circuit to ground according to Checking wiring and terminals - Permanent faults
- Check the power supply to terminal 29. The voltage should be approximately battery voltage with the ignition on
- Check the power supply to terminal 66. The voltage should be approximately battery voltage for 2 seconds after the ignition is switched on
- Check the power supply to terminal 30. The voltage should be approximately battery voltage for 2 seconds after the ignition is switched on
- Remedy as necessary.

Checking the ground terminal
- Check the ground lead at engine control module (ECM) terminals 3, 28, 33 and 67 for an open-circuit according to Checking wiring and terminals - Permanent faults
- Check the ground terminal on the engine control module (ECM) for contact resistance and oxidation according to Checking wiring and terminals - Permanent faults.

Remedy as necessary

[1][2]Checking Wiring And Terminals

Other information
- For information about signals,
- To connect the breakout box, Connecting the Breakout Box, ECM (EMS 2000)
- For further information about the circuit, see the relevant wiring diagram.