P0403
DTC P0403: EGR Control Circuit Malfunction1. 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 with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Do the EGR TEST in the INSPECTION MENU with the HDS.
Is the EGR SYSTEM OK?
YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the PCM.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the EGR valve 6P connector.
7. At the EGR valve side, measure resistance between the EGR 6P connector terminals No.4 and No.6.
Is there about 6.3 - 6.7 Ohms?
YES - Go to step 8.
NO - Go to step 14.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (73P).
10. Check for continuity between PCM connector terminal A15 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (A15) and the EGR valve, then go to step 15.
NO - Go to step 11.
11. Connect the EGR valve 6P connector terminal No.4 to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal A15 and body ground.
Is there continuity?
YES - Go to step 13.
NO - Repair open in the wire between the PCM (A15) and the EGR valve, then go to step 15.
13. Check for continuity between EGR valve 6P connector terminal No.6 and body ground.
Is there continuity?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then go to step 15,
NO - Repair open in the wire between the EGR valve and G101, then go to step 15.
14. Replace the EGR valve.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure.
18. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
19. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0403 is indicated, check for poor connections or loose terminals at the EGR valve and PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.