Question about 2002 Saturn VUE

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Driving @ 65mph the vehicle went into reduced power mode, like when the transmission usually goes out. It then stalled. The transmission had been noisy leading up to the stall. Pocket reader said 0 codes. It looks like the crankshaft position sensor is covered in smuck! What should I do next? Is it possible that the crankshaft position sensor is toast? How do I determine the state of the sensor?

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  • chaneywa May 08, 2010

    No. It will not start now.

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Testing Crankshaft sensor:

Method 1:
Pull up the RPM reading and crank the engine over. Hold accelerator to floor to shut off fuel to the engine. No reading find the crank sensor, inspect for damage, unplug electrical connector and clean it with electrcial contact cleaner spray and then plug the connector back into the sensor. Crank the engine while watching for RPM reading, again hold down the accelerator to prevent fuel flow to the engine. If you have RPM reading now sensor is ok, engine should run.

Method 2:
Do a continuity test on the crank sensor, if it reads zero, it is bad.
or
Unplug sensor connector,using a digital volt ohm meter set on ac volts position.Connect the leads to the two pins in the connector of the crank sensor.Then have a helper crank engine over.You should see ac voltage,if not,then your crank sensor is bad.

Posted on May 09, 2010

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  • Master
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Easiest way...
you need a DVOM
measure a/c voltage at the sensor
any voltage reading is good but to get more detailed you will need an oscilloscope

does the vehicle crank and/or run at idle?



Posted on May 08, 2010

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