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Ground Circuits

WARNING: This page is about a different car, the 1990 Volvo 760 and 1990 Volvo 740. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect ECU connector. See Figure and Figure . Using DVOM, check resistance between ECU connector terminals No. 10, No. 20, No. 32 and No. 34 and ground. Resistance should be zero in all cases.
  2. If resistance is not correct, check wiring harness between ECU and ground connections. Circuits No. 10, No. 20 and No. 34 are grounded behind driver kickpanel. If fault is found at terminal No. 32, retest with new solenoid valve relay. See Figure .
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