Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
The car is a 244 in the US. The ignition control unit(ICM) is a common failure point and the wiring also. The connector is quite hard to get off and the terminals can get spread easily. Carefully remove wire retainer and pull straight down. Look for a spread connector and corrosion. A test light is a quick test on the coil. Ground the test light and touch it to the positive terminal, key on it should lite up. Now put the test light lead on the positive battery terminal and touch the negative lead of the coil, when cranking it should flash the light dimly. If it passes these tests the coil is likely faulty. If the negative of the coil doesnt flash the lite, test the ignition module connections as follows :
Terminal 2 (Blue wire) B+Terminal 3 (Green wire) B+Terminal 10 (Black wire) GroundTerminal 9 (Black wire) Ground
Terminal 5 would require a labscope to test this lead. A square wave sent by the Hall effect sensor. A logic probe can test the low output signal by flashing leds.
If the above powers and grounds are there, the most common problem is a Ignition module. The hall effect sensors fail but not nearly as often as the ICM.
If one of the powers is missing look at the fuse panel and battery connections.
Let me know if this helps, Jason