Exhaust Gas Recirculation (EGR) System Test

1. Connect the SSTs (Special Service Tool) to the ECM (Engine Control Module) as shown.
2. Start the engine.
3. Drive the vehicle and verify that ECM terminal 1R and 1T voltages is battery positive voltage (B+) while the engine is still cold.
4. Warm up the engine to normal operating temperature and let it idle.
5. Drive the vehicle and verify that the Engine Signal Monitor green and red lights flash when the SST is set to 1R and 1t
6. Ground the ECM terminal 1T by using a jumper wire.
7. Verify that the engine runs roughly or stalls at idle.

NOTE
- If the tires are rotated by using a chassis roller with the ignition switch at ON, the ABS control module may memorize the action as a malfunction and the ABS warning light may illuminate. (Refer to the Troubleshooting Notes for the anti lock brake system). If the ignition switch is turned to LOCK and then to ON again, the ABS warning light will not illuminate, because the action will be considered a past malfunction.