Fault-Tracing Information

Fault-tracing

Checking the power supply and ground for the engine control module (ECM)

Checking the power supply
- Check the fuse for Engine control module (ECM) in the engine compartment fuse box. If the fuse is blown, check the circuit after the fuse. Check for a short-circuit to ground.
- Check the voltage feed to the Engine control module (ECM). The voltage must be approximately battery voltage.

Checking the ground terminal
- Check the ground leads between the engine control module (ECM) and the ground terminal. Check for an open-circuit
- Check the control module ground terminal. Check for contact resistance and oxidation.
Remedy as necessary.

Other information:
- Checking wiring and terminals Checking Wiring and Terminals
- For further information about the circuit after the fuse, refer to the wiring diagram.

Was a fault detected?

Yes - Verification

No - Signal missing

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Signal missing

FAULT FOUND - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Switch on the ignition for at least 10 seconds.
Try communicating with the control module by selecting one of the functions for vehicle communication under the DIAGNOSTICS tab.

Is communication established?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - VERIFIED

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Fault-tracing information

FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the power supply and ground for the engine control module (ECM)

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