## DTC Troubleshooting: P0443 (92-4)

DTC P0443 (92-4): | A electrical problem in the EVAP Canister Purge Valve circuit.

1. | Reset the ECM/PCM.

2. | Turn the ignition switch ON (II). Is the DTC P0443 indicated? YES - Go to 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires between the EVAP canister purge valve and at the ECM.n

3. | Turn the ignition switch OFF.

4. | Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) and connect a vacuum gauge (C) to the hose.

5. | Start the engine end let it idle. Is there vacuum? YES - Go to 6. NO - Go to 11.

6. | Turn the ignition switch OFF.

7. | Disconnect the EVAP canister purge valve 2P connector.

8. | Check for continuity between the EVAP canister purge valve 2P connector terminal No. 2 and body ground. Is there continuity? YES - Go to 9. NO - Replace the EVAP canister purge valve.n

9. | Disconnect ECM/PCM connector B (24P).

10. | Check for continuity between the EVAP canister purge valve 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the EVAP canister purge valve and the ECM/PCM (B21).n NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/ PCM.n

11. | Turn the ignition switch OFF.

12. | Disconnect the EVAP canister purge valve 2P connector.

13. | Turn the ignition switch ON (II).

14. | At the hamess side, measure voltage between the EVAP canister purge valve 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to 15. NO - Repair open in the wire between No. 16 (7.5 A) fuse in the under-dash fuse/relay box and the EVAP canister purge valve.n

15. | Turn the ignition switch OFF.

16. | Reconnect the EVAP canister purge valve 2P connector.

17. | Turn the ignition switch ON (II).

18. | Measure voltage between ECM/PCM connector terminals A5 and B21. Is there battery voltage? YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.n NO - Repair open in the wire between the EVAP canister purge valve and the ECM/PCM (B21). If wire is OK, replace the EVAP canister purge valve.n