DTC Troubleshooting: P0403 (182-5)

DTC P0403: EGR Valve Circuit Open

1. Turn the ignition switch ON (II).

1. Clear the DTC with the HDS.

1. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0403 indicated?

YES | - | Go to Step 4 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the ECM.■

1. Check for Temporary DTCs or DTCs with the HDS.

Are DTC P0045, P0403 and P2008 indicated at same time?

YES | - | Go to Step 5 .
NO | - | Go to Step 10 .

1. Turn the ignition switch OFF.

1. Check No. 10 IGP2 (20 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES | - | Go to Step 7 .
NO | - |

- Repair short in the wire between No. 10 IGP2 (20 A) fuse and PGM-FI main relay 2, then go to Step 21 .
- Repair short in the wire between PGM-FI main relay 2 and the EGR valve, the IMRC solenoid, the turbocharger boost control solenoid, then go to Step 21 .

1. Check PGM-FI main relay 2.

Is PGM-FI main relay 2 OK?

YES | - | Go to Step 8 .
NO | - | Replace PGM-FI main relay 2, then go to Step 22 .

1. Disconnect PGM-FI main relay 2.

1. Measure voltage between PGM-FI main relay 2 4P connector terminal No. 1 and body ground.

Is there battery voltage?

YES | - | Repair open in the wire between PGM-FI main relay 2 and the EGR valve, the IMRC solenoid, the turbocharger boost control solenoid, then go to Step 21 .
NO | - | Repair open in the wire between No. 10 IGP2 (20 A) fuse in the under-hood fuse/relay box and PGM-FI main relay 2, then go to Step 21 .

1. Turn the ignition switch OFF.

1. Disconnect the EGR valve 6P connector.

1. Turn the ignition switch ON (II).

1. Measure voltage between EGR valve 6P connector terminal No. 4 and body ground.

Is there battery voltage?

YES | - | Go to Step 14 .
NO | - | Repair open in the wire between PGM-FI main relay 2 and the EGR valve, then go to Step 21 .

1. Turn the ignition switch OFF, and wait 30 seconds.

1. At valve side, measure resistance between EGR valve 6P connector terminals No. 4 and No. 6.

Is there about 7 Ω at room temperature?

YES | - | Go to Step 16 .
NO | - | Go to Step 19 .

1. Connect EGR valve 6P connector terminal No. 6 to body ground with a jumper wire.

1. Disconnect ECM connector No. 1 (96P).

1. Check for continuity between ECM connector No. 1 terminal No. 48 and body ground.

Is there continuity?

YES | - | Go to Step 25 .
NO | - | Repair open in the wire between the EGR valve and ECM connector No. 1 terminal No. 48, then go to Step 21 .

1. Turn the ignition switch OFF.

1. Replace the EGR valve.

1. Reconnect all connectors.

1. Turn the ignition switch ON (II).

1. Reset the ECM with the HDS.

1. 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 the ECM, 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.■

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

1. 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 the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. ■