Turbocharger Control Module: Testing and Inspection

TESTING PROCEDURE:

NOTE: While trouble shooting, always check the wiring, fuses and connectors for good condition and routing. Also check ground locations for good connection. Use the wiring diagrams found in CHASSIS ELECTRICAL DIAGRAMS to supplement your testing efforts.

1. Turn ignition OFF.
2. Disconnect turbo boost ECU connector.
3. Connect a voltmeter between ECU connector pin 3 and ground.
4. Turn ignition ON.

Reading: approx. 12 volts

If not, check turbo boost relay, refer to BOOST SOLENOID, TURBOCHARGER.
5. Connect an ohmmeter between pin 4 and ground.

Reading: 0 ohm

If not, repair black wire to ground.
6. Turn ignition OFF.
7. Disconnect all test equipment and reconnect ECU connector.