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Home >> Volvo >> 1993 >> 940 Base, 4D Sedan, AW70 >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Controls - System/Component Tests) >> Computerized Engine Controls >> Electronic Control Unit - Ignition (850) >> Power Circuit Check
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Power Circuit Check

WARNING: This page is about a different car, the 1994 Volvo 960, 1994 Volvo 940, and 1994 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect voltmeter between measuring unit terminals No. 20 and 43. Operate starter motor. Voltmeter should indicate .7-1.3 volts. If voltage is not as specified, repeat test using new ECU.
  2. To check distributor ignition signal to fuel injection ECU, connect voltmeter between measuring unit terminals No. 20 and 52. Operate starter motor. Voltmeter should indicate about 5-7 volts. If voltage is not as specified, repeat test using new distributor ignition ECU.
  3. Turn ignition off. To check voltage supply to ECU, connect voltmeter between measuring unit terminals No. 20 and 10. Battery voltage should be present. Turn ignition on. Connect voltmeter between measuring unit terminals No. 20 and 30. Battery voltage should be present. If battery voltage is not present, check wiring.
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