Signal Too High - Permanent Fault

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

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 for a short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Permanent Fault

Hint: Use an electrician's screwdriver with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage.

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 resistance values, see Component Specifications. Specifications
- 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.