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Home › Volvo › 1998 › S90 AW30-43 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › Diagnostic Tests › DTC 536: Ignition Discharge Module (IDM) Group "E"

DTC 536: Ignition Discharge Module (IDM) Group "E"

  1. Turn ignition on. Using scan tool, activate A/C. If A/C relay switches on and off, go to step 3). If A/C relay does not switch on and off, go to next step.
  2. Ensure ignition is off. Remove A/C relay "F" from relay base. Turn ignition on. Connect voltmeter between relay base terminal No. 4 and ground. If voltmeter reads 2-8 volts, replace A/C relay. If voltmeter does not read 2-8 volts, check for a short circuit to voltage or ground in wiring between A/C relay terminal No. 4 and ECM connector terminal B40.
  3. Ensure ignition is off. Disconnect all injectors. Disconnect ignition coils for cylinders No. 3, 4, 5 and 6. Install new spark plugs in ignition coils. Place spark plugs against engine and operate starter. If spark is present at spark plugs, fault is intermittent. Go to step 8). If spark is not present at cylinder No. 3, go to next step. If spark is not present at cylinder No. 4, go to step 5). If spark is not present at cylinder No. 5, go to step 6). If spark is not present at cylinder No. 6, go to step 7).
  4. Ensure ignition is off. Disconnect front connector from Ignition Discharge Module (IDM). Turn ignition on. Connect test light between IDM connector terminal No. 7 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 connector terminal No. 7 and ECM connector terminal B14.
  5. Ensure ignition is off. Disconnect rear connector from Ignition Discharge Module (IDM). Turn ignition on. Connect test light between IDM connector terminal No. 7 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 connector terminal No. 7 and ECM connector terminal B35.
  6. Ensure ignition is off. Disconnect front connector from Ignition Discharge Module (IDM). 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 connector terminal No. 5 and ECM connector terminal B10.
  7. Ensure ignition is off. Disconnect rear connector from Ignition Discharge Module (IDM). 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 connector terminal No. 2 and ECM connector terminal B34.
  8. If fault is intermittent, check for an intermittent short circuit to voltage in wiring between IDM connector terminal No. 7 and ECM connector terminal B14, between IDM connector terminal No. 5 and ECM connector terminal B10, and between IDM connector terminal No. 7 and ECM connector terminal B34. Also check for an intermittent short circuit to ground or voltage between A/C relay terminal No. 4 and ECM connector terminal B40. Repair as necessary.
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