Signal Too High

ECM-4000 CANISTER PURGE (CP) VALVE
SIGNAL TOO HIGH

Checking for intermittent fault



- 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 - Continue below.
No - Skip to "Checking the Connector"


Fault-tracing information



Control module previously registered a fault. The fault is now no longer present.


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
--Testing Complete--


Checking the 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.

Check if a clicking sound is heard from the canister purge (CP) valve.
If the canister purge (CP) valve now functions it means that the cause of the fault has been loose connections in the connector.

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


Checking wiring and components



Check cable between control module # B40 and canister purge (CP) valve terminal 2. Check for an open-circuit. Check for a short-circuit to supply voltage.

Check cable between canister purge (CP) valve terminal 1 and system relay terminal 3. Check for an open-circuit.

Remedy as necessary.

Other information:
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the control module, Engine Control Module (ECM), Replacing
- To access/replace the EVAP canister shut-off valve, EVAP Canister Shut-Off Valve, Replacing
- For information about signals, Pinout Values and Diagnostic Parameters
- Checking Wiring and Terminals

Was a fault found in the wiring?
Yes - Skip to "Verification"
No - Continue below.


Replacing component



- Ignition off.
Try a new EVAP canister shut-off valve according to EVAP Canister Shut-Off Valve, Replacing


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.