Signal Missing. Permanent Fault

Other Diagnostic Trouble Codes
- Read off other diagnostic trouble codes (DTC).
- Are EFI-445 and/or EFI-447 stored?

Yes:
^ Proceed to: Checking Fuse 3 section below.

No:
^ Proceed to: Checking Power Cable section below.





Checking Fuse 3
- Ignition OFF.
- Check that fuse 3 (11B/3) is intact.

If reading is OK:
^ Proceed to: Checking Voltage to Fuse 3 section below.

If reading is incorrect:
^ Check circuit after fuse 3 for a short-circuit to ground.
^ Proceed to: Verification section below.





Checking Voltage to Fuse 3
- Ignition ON.
- Fuse 3 (11B/3) removed.
- Connect a voltmeter between the rear output on the fuse holder for fuse 3 (11B/3) and ground.
- The voltmeter should read battery voltage.

If reading is OK:
^ Check cable between fuse 3 and canister purge (CP) valve terminal 2 for an open-circuit.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between fuse 3 and main relay (2/32) terminal 3 for an open-circuit.
^ Proceed to: Verification section below.





Checking Power Cable
- Ignition OFF.
- Disconnect connector from canister purge valve.
- Ignition ON.
- Connect a voltmeter between canister purge valve connector terminal 1 and ground.
- The voltmeter should read battery voltage.

If reading is OK:
^ Proceed to: Checking Canister Purge Valve section below.

If reading is incorrect:
^ Check power cable between canister purge valve terminal 1 and main relay (2/32) terminal 3 for an open-circuit.
^ Proceed to: Verification section below.





Checking Canister Purge Valve
- Ignition OFF.
- Connect an ohmmeter to canister purge valve between terminal 1 and 2.
- The ohmmeter should read approx. 22 - 30 ohms.

If reading is OK:
^ Proceed to: Checking the Signal Cable section below.

If reading is incorrect:
^ Try a new canister purge valve.
^ Proceed to: Verification section below.





Checking the Signal Cable
- Ignition OFF.
- Connect the breakout box and check ground terminals.
- Connect an ohmmeter between terminal # 39 (A39) on the breakout box on the breakout box and canister purge valve connector terminal 2.
- The ohmmeter should read approx. 0 ohms.

If reading is OK:
^ The cause of the fault has been loose connections in the engine control module (ECM) and/or canister purge valve connectors.
^ Check connectors for contact resistance and oxidation and remedy.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between canister purge valve terminal 2 and engine control module # A39 for an open-circuit.
^ Proceed to: Verification section below.





Verification
After carrying out the repair, check that the fault has been remedied as follows:

- Ignition OFF.
- Canister purge valve and control module connected.
- Ignition ON.
- Activate canister purge valve.
- A "clicking sound" can be heard from the canister purge valve when it is activated.
- Is the canister purge valve working?

If reading is OK:
^ Fault corrected.

If reading is incorrect:
^ Proceed to: Fault-tracing Information section below.

Fault-tracing Information
The verification result shows that the fault persists.

- Do you want to exit fault-tracing?

Yes:
^ Fault not corrected.

No:
^ Proceed to: Other Diagnostic Trouble Codes section above.