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My 2002 Nissan Altima is occasionlly stalling out at Stop lights. It drives fine but when stopped at a light it just shuts off; I can restart it every time with no problems. What could this be?


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It's probably the crank sensor


1. Verify battery voltage to the CKP sensor on the Red/Green wire.

2. Verify that ground is good for the CKP sensor on the Black wire - look for 0.05 volts or less.

3. Scope the CKP sensor output signal on the Yellow wire - look for a 0 to battery voltage square wave signal. Check with a Nissan dealer for recall NTB06-051 that indicates a reflash for the engine control module.


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