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Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - Tests W/Codes - Non-Turbo (M/T) - MOTRONIC 4.4) >> Circuit Tests >> DTC 535 - Ignition Discharge Module (IDM) Group "E"

DTC 535 - Ignition Discharge Module (IDM) Group "E"

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using scan tool, read off other DTCs. If DTC 445 is present, perform testing for that DTC first. If DTC 445 is not present, go to next step.
  2. Check status message on Volvo Scan Tool (998-8686 ). If scan tool indicates FAULTY SIGNAL, go to next step. If scan tool indicates FAULTY SIGNAL, INTERMITTENT FAULT, check for an intermittent short to voltage in wiring between A/C relay terminal No. 4 and ECM connector terminal B40. Repair as necessary.
  3. Connect breakout box to ECM connector. Reconnect ECM. Turn A/C on. Put blower fan on low speed. Start and idle engine. Connect voltmeter between breakout box pins No. 40 and 28. If voltmeter does not read 0-2 volts, go to next step. If voltmeter reads 0-2 volts, check for an intermittent short to voltage in wiring between A/C relay terminal No. 4 and ECM connector terminal B40. Repair as necessary.
  4. Turn ignition off. Disconnect A/C relay. Turn A/C on. Put blower fan on low speed. Start and idle engine. Connect voltmeter between breakout box pins No. 40 and 28. If voltmeter reads 0-2 volts, replace A/C relay. If voltmeter does not read 0-2 volts, check wiring for short circuit to voltage between A/C relay terminal No. 4 and ECM connector terminal B40.
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