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2GNT Checking The Coil Pack
This test will help with a no start condition. There are several sensors that are responsible for supplying a complete circuit to allow battery voltage to make it to the coil pack. These sensors and electrical components are, but not limited to, Vehicle speed sensor, Crankshaft position sensor, Camshaft position sensor, ASD Relay, PCM/ECU, and several other components.
This is a portion of a test from the Chrysler Diagnostic Powertrain manual. It is not complete because some tests require the use of the mopar hand held diagnostic computer. I have added some steps where the condition created by the dealer computer can be recreated with it.
Checking the coil:
Disconnect plug wires one and four from the coil pack. Measure the resistance across the two points where the wires attatch. The resistance should be betwee 10.9 and 14.7 K Ohms. If it is not, replace the coil pack.
Disconnect plug wires 2 and 3 and check them as well. If the resistance is out of that range, replace the coil pack.
If the resistance is within spec on both 1&4, and 2&3 test the resistance of the spark plug wires. The wires should each read below 15 K Ohms, if they do not, replace your spark plug wires.
Remove the spark plugs and Inspect them. If they are need replacing, do so.
This step may require a helper.
Disconnect the coil connector. While trying to start the car, measure the voltage at the middle pin of the harness. It is the ASD Relay output (Automatic Shutdown Relay). The voltage should be above 10 volts.
If the voltage is not above 10 volts then there is an open circuit or high resistance in the ASD Relay circuit. If the voltage is above 10 volts, the coil could be bad.
There are more tests that may be required to properly diagnose a no start condition.
Doug
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