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1. key off position.
2. Disconnect wiring harness connector to ignition power stage module (same part as test # 1)
3. Red test lead to terminal # 5 of connector and black test lead to ground.
4. Have a helper try to start the car.
5. Meter voltage should show about 2 volts.
6. Stop test. Key off.
7. Reconnect wiring harness connector to ignition power stage module .
This tests the signal from the Ignition ECU. It helps to narrow the diagnosis or problem area. At least t it is supposed to (another story entirely with Volvos).
diyer
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