Fault-Tracing Information

Fault-tracing

Checking components and wiring








- Ignition off
The diagnostic trouble code (DTC) is stored if there is no communication between the engine control module (ECM) and the alternator control module (ACM). This may be due to a fault in the signal cable between the control modules or a damaged communication device in one or all of the control modules.

Hint: This diagnostic trouble code (DTC) can be stored if a generator (GEN) with a charge regulator not intended for LIN communication is installed.

Check the connector on the alternator control module (ACM). Check for contact resistance and oxidation.
Check the signal cable for open circuit, short circuit to ground and short circuit to supply voltage.
Take readings between engine control module (ECM) terminal #A25 (A#25) and the alternator control module (ACM).
Remedy as necessary.

Other information
- Connecting the breakout box, B6304T4 Breakout Box Connection, Engine Control Module (ECM)
- Signal specification, B6304T4 Signal Specification, Engine Control Module (ECM)
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults

Continue - Verification

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Verification




Verification

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








- Ignition off
- Reconnect the connectors, components, etc.
- Start the engine.
- Read the diagnostic status and fault status for the diagnostic trouble code by selecting the diagnostic trouble code in the list.
Increase the engine speed a few times until the scan is "Implemented".
Check the fault status for the diagnostic trouble code when the scan is "Implemented". When the function is correct the fault status should be "No fault found" when the scan is implemented.





Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking components and wiring

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