Ground Circuits
WARNING: This page is about a different car, the 1989 Volvo 760 and 1989 Volvo 740. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Using a DVOM, check resistance between ECU connector terminals No. 10, 20, 32 and 34 and ground. Resistance should be zero in all cases.
- If resistance is not correct, check wiring harness between ECU and ground connections. Circuits No. 10, 20 and 34 are grounded behind driver kickpanel. If a fault is found at terminal No. 32, test with a new solenoid valve relay. See Figure.