The camshaft sensor in the 1995 Subaru Impreza sends a signal to the computer which the computer then uses the signal to make adjustments to other engine components, as needed. Two tests can be run with a voltmeter -- to check for voltage and for ohms, or resistance. If the camshaft sensor malfunctions, the Impreza will usually run, but it will run poorly. In some cases, it may not start again once it has been shut off.
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Things you need
- 2 straight pins or needles
Stick a pin into each wire on the camshaft sensor wiring harness connector, just behind the plastic connector. Touch the red, positive lead to the pin on the positive wire.
Touch the voltmeter's black, negative lead to the pin on the negative wire on the wiring harness connector. The wire for the negative side is black or black with a white stripe.
Start the vehicle. The voltage should be 1.3 volts at an idle. Have a helper bring the engine rpm up slowly. The voltage should smoothly and steadily rise as the rpm rises.
Set the voltmeter to ohms. Unplug the wiring harness connector. Stick the positive lead into the positive side of the connector and the negative lead into the negative side of the connector. The ohmmeter should read 2.6k (2,600) ohms.
Replace the crankshaft sensor if it doesn't pass either test.
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