Question Hello Roland here's a long and tedious question. My 91 Plymouth Sundance stuttered to a stop and refused to restart. After the tow home I read the codes using the key dance, got a 14, replaced the Map sensor, and still no start. Checked codes again got 11. Then going back to basics I checked for spark- got none. Read my Chiltons to check for distributor reference pickup. Using the jumper wire I got a spark at the coil wire then checked with voltmeter from harness to ground and got slightly over 7 volts indicating coil failure. Replaced that- still no start. Checked codes again got same reading. Went all out and bought new PCM- still no spark or start. Also, now the only codes readable are 12 and 55. In other words nothing wrong. Could the ASD relay be bad and not be readable off the dash light? Or what else to look for? Thanks for any help, WW
Answer Hi Wolfgang,
You can temporarily by-pass the ASD by removing it and jumping a wire from the front to the rear pin of the socket. That will put 12v on the coil and fuel pump but should not be operated regularly that way for safety reasons.
Then you could check that the distributor sensor is pulsing properly by measuring the voltage between black/gray and black/light blue wires on pins 24 and 4 of the PCM where you should observe a pulsation between 5 and 0.3V as you rotate the engine by hand. The orange wire on pin 7 should be 8v constant.
If you have that pulsation and the 12V on the coil then you should get spark.
Also, check the vacuum like from the MAP to the intake manifold for cracks.
Let me know what you find.
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Thanks Roland, good, precise answer. Jumped asd and heard the pump whirl, though it wouldn't start. Probed wires with voltmeter and didn't get a flicker of hope. Ordered Hall effect sensor/pickup and new rotor and cap and will put on Sunday morning. Hopefully that's that. Btw, no ASD shows on the parts store computer. Thanks again!
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