Signal Missing - Permanent Fault

ECM-6800 TURBOCHARGER (TC) CONTROL VALVE
SIGNAL MISSING - PERMANENT FAULT

Checking connector



- Ignition off.
- Check turbocharger (TC) control valve connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Activate turbocharger (TC) control valve.
- A clicking sound should be heard from the turbocharger (TC) control valve.

If the function is OK the cause of the fault was loose connections in the connector.

Other information
- To access/replace the turbocharger (TC) control valve, Turbocharger (TC) Control Valve, Replacing

Is the function OK?
Yes - Testing Complete.
No - Continue below.


Checking component and wiring



Check signal cable between engine control module (ECM) # A38 (# A38) and turbocharger (TC) control valve # 2 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check power supply cable between turbo charger valve # 1 and system relay for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information:
- To connect the breakout box Connecting the Breakout Box (ECM)
- To access/replace the turbocharger (TC) control valve, Turbocharger (TC) Control Valve, Replacing
- Turbocharger (TC) control valve # 1 has Ubat power supply from the system relay.
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Verification



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

- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Activate turbocharger (TC) control valve
- A click should be heard from the turbocharger (TC) control valve.
- Check that the function is OK.

Is function OK?
Yes - Testing Complete.
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed. Exit fault tracing for this diagnostic trouble code (DTC) or make another attempt.