DTC Troubleshooting: P0489 (182-6)

DTC P0489: EGR Valve Circuit Shorted to Ground

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 P0489 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. Turn the ignition switch OFF, and wait 30 seconds.

1. Disconnect the EGR valve 6P connector.

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

1. Check for continuity between EGR valve 6P connector terminal No. 6 and body ground.

Is there continuity?

YES | - | Repair short in the wire between the EGR valve and ECM connector No. 1 terminal No. 48, then go to Step 10 .
NO | - | Go to Step 8 .

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 14 .
NO | - | Go to Step 9 .

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 P0489 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 P0489 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. ■