Ground 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.
- Connect ohmmeter between ground and measuring unit terminal No. 20, then between ground and measuring unit terminal No. 29. Ohmmeter should indicate about zero ohms. If about zero ohms is not present, check control unit grounds.
- Connect ohmmeter between measuring unit terminal No. 20 and measuring unit terminals No. 8, 12, 14, and 23. Ohmmeter should indicate about zero ohms in all cases. If reading is too high, repeat test using new fuel injection ECU.