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Question

car won't start


Sent to Car Experts September 10, 2005 8:49 a.m.
just changed the harmonic balancer in 92 grand am 3.3 v6 and car won't start. originally had wrong balancer but corrected the problem by exchangin it where bought. installed proper part but still no go......crank sensor? 17 daughter attempted to start car when car was already running before any problems were present????????
could her trying to start car while already running have damaged any other components that is keeping it from starting now?
Customer (name blocked for privacy)
Status: Closed   Value: $7   
Answer
September 10, 2005 8:58 a.m. (8 minutes and 34 seconds later)
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PictureMarc  -- Technician,Auto -- 98% Positive Feedback on 1027 Car Accepts
32 years exp. automotive repair NYS emisisions repair cert.
Answer
September 10, 2005 9:00 a.m. (2 minutes and 16 seconds later) 		ACCEPTED Check Mark

TESTING

See Figure 1

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Fig. 1: Attach suitable jumper wires between the CKP sensor and CKP sensor harness. A DC volt meter can then be attached to the necessary terminals to test the sensor as the engine is being cranked


Typically, when a crankshaft position sensor DTC is set, checking the integrity of the wiring connecting the sensor (using a digital volt meter) to the PCM harness connector is the best way to determine if the sensor is faulty. If the wires all have continuity, and a DTC is set, it is probable that the sensor is faulty.

Although a procedure is given here for testing of the crankshaft sensor itself, it is generic, and may not apply to every vehicle. Typically, the crankshaft position sensor harness connector wire leads are labeled. However, it is advisable to use this procedure in conjunction with the wiring diagrams in Chassis Electrical to identify the terminals on the crankshaft sensor before connecting test leads.

  1. Turn the ignition key OFF.

  2. Unplug the sensor electrical harness and check the terminals for corrosion and damage.

  3. Check the sensor wiring harness wires for continuity and repair as necessary.

  4. Attach the sensor harness making sure it is firmly engaged.

  5. Using a Digital Volt Ohm Meter (DVOM) set on the DC scale, backprobe the sensor signal terminal (terminal A) with the positive lead of the meter and backprobe the sensor ground terminal (terminal B) with the negative lead of the meter.

  6. Have an assistant crank the engine and observe the meter.

  7. You should have approximately a 5 volt reference signal pulse. If not the sensor may be defective.

PictureMarc  -- Technician,Auto -- 98% Positive Feedback on 1027 Car Accepts
32 years exp. automotive repair NYS emisisions repair cert.

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