Signal Missing - Permanent Fault

ECM-4000 CANISTER PURGE (CP) VALVE
SIGNAL MISSING - PERMANENT FAULT

Checking connector



- Ignition off
- Check canister purge (CP) 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 canister purge (CP) valve.

A "click" should be heard when the canister purge (CP) valve is activated.
If canister purge (CP) valve is now OK this indicates that the fault was caused by poor contact in the connector.

Is the canister purge (CP) valve working?
Yes - Testing Complete.
No - Continue below.


Checking wiring and components



Check canister purge (CP) valve resistance.

Check signal cable between control module # A9 (# A9) and canister purge (CP) valve terminal 2 and power supply between system relay terminal 3 and canister purge (CP) valve terminal 1 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module Connecting the Breakout Box (ECM)
- To access/replace the canister purge (CP) valve, Canister Purge (CP) Valve, Replacing
- 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.
- Reconnect connectors, reinstall components
- Ignition on.
- Activate canister purge (CP) valve.

A "click" should be heard when the canister purge (CP) valve is activated.

Is the canister purge (CP) valve working?
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.