DTC Troubleshooting: P0443 (92)

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 65 °C (149 °F).

6.Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) on the throttle body, and connect a vacuum pump/gauge to the hose.

 

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 No. 2 and body ground.

 

Is there continuity?


YES - Go to 11.


NO - Go to 24.


11.Jump the SCS line with the HDS.

12.Disconnect ECM/PCM connector B (24P).

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 (B21), then go to 25.


NO - Go to 32.


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. 4 ACG (10 A) fuse in the under-dash fuse/relay box, then go to 26.

18.Turn the ignition switch OFF.

19.Jump the SCS line with the HDS.

20.Disconnect ECM/PCM connector B (24P).

21.Connect EVAP canister purge valve 2P connector terminal No. 2 to body ground with a jumper wire.

 

22.Check for continuity between ECM/PCM connector terminal B21 and body ground.

 

Is there continuity?


YES - Go to 23.


NO - Repair open in the wire between the EVAP canister purge valve and the ECM/PCM (B21), then go to 25.

23.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 32.


NO - Go to 24.


24.Replace the EVAP canister purge valve.

25.Reconnect ECM/PCM connector B (24P).

26.Reconnect all connectors.

27.Turn the ignition switch ON (II).

28.Reset the ECM/PCM with the HDS.

29.Do the ECM/PCM idle learn procedure.

30.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 31.


31.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 the fuel quality. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, keep idling until a result comes on.


32.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

33.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