DTC 534: Ignition Discharge Module (IDM) Group "D"
- Turn ignition off. Disconnect all injectors. Disconnect ignition coils for cylinders No. 1 and 2. Install new spark plugs in ignition coils. Place spark plugs against engine and operate starter. If spark is present at both coils, go to step 4). If no spark is present at cylinder No. 1, go to next step. If no spark is present on cylinder No. 2, go to step 3).
- Ensure ignition is off. Disconnect 7-pin front Ignition Discharge Module (IDM) connector. Turn ignition on. Connect test light between IDM connector terminal No. 2 and ground. If test light does not come on, replace IDM. If test light comes on, check for short circuit to voltage in wiring between IDM terminal No. 2 and ECM connector terminal B11.
- Ensure ignition is off. Disconnect 7-pin rear Ignition Discharge Module (IDM) connector. Turn ignition on. Connect test light between IDM connector terminal No. 5 and ground. If test light does not come on, replace IDM. If test light comes on, check for short circuit to voltage in wiring between IDM terminal No. 5 and ECM connector terminal B13.
- Turn ignition on. Using scan tool, activate cooling fan high speed. If cooling fan relay operates and cooling fan runs after 3 seconds, go to step 7). If cooling fan relay and cooling fan do not operate, go to next step.
- Ensure ignition is off. Disconnect cooling Fan Control (FC) relay connector "B". Turn ignition on. Connect test light between FC relay connector "B" terminal No. 2 and ground. If test light does not come on, go to next step. If test light comes on, check for a short circuit to voltage in wiring between FC relay connector "B" terminal No. 2 and ECM connector terminal A22. Repair as necessary.
- Ensure ignition is off. Wait about 2 minutes. Disconnect cooling Fan Control (FC) relay connector "B". Connect ohmmeter between FC relay connector "B" terminal No. 2 and ground. If ohmmeter reads infinite resistance, replace FC relay. If ohmmeter does not read infinite resistance, check for short circuit to ground in wiring between FC relay connector "B" terminal No. 2 and ECM connector terminal A22.
- Connect breakout box to ECM connector and check ground connections. See SYSTEM/COMPONENT TESTS article. Connect ECM to breakout box. Turn ignition on. Connect voltmeter between breakout box pins No. 7 and 28. If voltmeter reads 0-2 volts, go to next step. If voltmeter does not read 0-2 volts, check wiring between instrument cluster connector terminal B11 and ECM connector terminal B7 for a short circuit to voltage.
- Ensure ignition is off. Wait about 2 minutes. Connect breakout box to ECM connector. Connect ohmmeter between breakout box pins No. 7 and 28. If ohmmeter reads about 25 ohms, go to next step. If ohmmeter does not read about 25 ohms, check for short circuit to ground in wire between instrument cluster connector terminal B11 and ECM connector terminal B7. Repair as necessary.
- Connect breakout box to ECM connector and check ground connections. See SYSTEM/COMPONENT TESTS article. Connect ECM to breakout box. Turn ignition on. Connect voltmeter between breakout box pins No. 12 and 28. If voltmeter reads 0-1 volt, go to next step. If ohmmeter does not read 0-1 volt, check for a short circuit to voltage in wiring between ECM connector terminal B12 and Transmission Control Module (TCM) connector terminal B12. Repair as necessary.
- Problem is intermittent. Check for an intermittent short circuit to voltage in wiring between IDM connector terminal No. 2 and ECM connector terminal B11, and between IDM connector terminal No. 5 and ECM connector terminal B13. Check for an intermittent short circuit to voltage or ground in wiring between FC relay connector "B" terminal No. 2 and ECM connector terminal A22, and between instrument panel connector terminal B11 and ECM connector terminal B7. Also check for an intermittent short to voltage in wiring between ECM connector terminal B12 and Transmission Control Module (TCM) connector terminal B12. Repair as necessary.