| DTC P0443: | Evap Canister Purge Valve Circuit Malfunction |
| 1. | Turn the ignition switch ON (II). |
| 2. | Clear the DTC with the HDS. |
| 3. | Start the engine. Hold the engine speed at 3,000 rpm (min-1) without load (in Park or neutral) until the radiator fan comes on, then let it idle. |
| 4. | Check for Temporary DTCs or DTCs with the HDS. Is DTC P0443 indicated? YES - Go to 5. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EVAP canister purge valve and the ECM/PCM.n |
| 5. | Turn the ignition switch OFF, and allow the engine to cool below 60 °C (140 °F). |
| 6. | Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) in the engine compartment, and connect a vacuum pump/gauge to the hose.
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| 7. | Start the engine, and let it idle. Is there vacuum? YES - Go to 8. NO - Go to 14. |
| 8. | Turn the ignition switch OFF. |
| 9. | Disconnect the EVAP canister purge valve 2P connector. |
| 10. | Check for continuity between EVAP canister purge valve 2P connector terminal No. 2 and body ground.
Is there continuity? YES - Go to 11. NO - Go to 23. |
| 11. | Jump the SCS line with the HDS. |
| 12. | Disconnect ECM/PCM connector B (44P). |
| 13. | Check for continuity between 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 (B3), then go to 24. NO - Go to 30. |
| 14. | Turn the ignition switch OFF. |
| 15. | Disconnect the EVAP canister purge valve 2P connector. |
| 16. | Turn the ignition switch ON (II). |
| 17. | Measure voltage between EVAP canister purge valve 2P connector terminal No. 1 and body ground.
Is there battery voltage? YES - Go to 18. NO - Repair open in the wire between the EVAP canister purge valve and the No. 3 ALTERNATOR (10 A) fuse in the under-dash fuse/relay box, then go to 24. |
| 18. | Turn the ignition switch OFF. |
| 19. | Jump the SCS line with the HDS. |
| 20. | Disconnect ECM/PCM connector B (44P). |
| 21. | Check for continuity between ECM/PCM connector terminal B3 and EVAP canister purge valve 2P connector terminal No. 2.
Is there continuity? YES - Go to 22. NO - Repair open in the wire between the EVAP canister purge valve and the ECM/PCM (B3), then go to 24. |
| 22. | Measure resistance between EVAP canister purge valve 2P connector terminals No. 1 and No. 2.
Is there about 33 W at room temperature? YES - Go to 30. NO - Go to 23. |
| 23. | Replace the EVAP canister purge valve. |
| 24. | Reconnect all connectors. |
| 25. | Turn the ignition switch ON (II). |
| 26. | Reset the ECM/PCM with the HDS. |
| 27. | Do the ECM/PCM idle learn procedure. |
| 28. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0443 is indicated, check for poor connections or loose terminals at the EVAP canister purge valve and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to 29. |
| 29. | Monitor the OBD STATUS for DTC P0443 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete.n NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister purge valve and the ECM/PCM, then go to 1. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to 27 and recheck. |
| 30. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 31. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0443 is indicated, check for poor connections or loose terminals at the EVAP canister purge valve and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |