Quote:
Originally Posted by Jag1980
I just bought one of these Computer safe LED test lights yesterday.
Now to test what you mentioned, I just need to unplug the main harness from the computer (ECM) and test the wires at the plug-in with the key on correct?
Is there a way to check a Crank sensor beside just replacing it?
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Right, as far as testing for voltage and ground to the ECM, if you disconnect the ECM, you'll only be able to test inputs to the ECM that don't rely on a reference voltage from the ECM. You will be able to test ground and power, but I'd start by checking for voltages to the ECM relay first.
As for checking the Crankshaft Position (CKP) sensor, you might be able to test that with your computer safe (and presumably LED) test light. You could also use a very fast multimeter, but an oscilloscope would be ideal. You're looking for a low voltage AC signal when the engine is cranking. This would be rapid blinks on an LED test light if it will work for low voltages as well.
-Rod