Sensor & Ignition Module Check
- Turn ignition on. Disconnect secondary coil wire from distributor and hold wire with insulated pliers 1/2" from a known engine ground. Disconnect 4-pin connector from ignition module. If no spark exists, go to step 5). If spark exists at coil, go to next step.
- Check resistance between terminals "C" (White wire) and "D" (Light Blue wire) at 4-pin wiring harness connector. See Fig 1
. If ohmmeter reading is 400-800 ohms, go to step 6). If ohmmeter reading is incorrect, go to next step.
Courtesy of CHRYSLER MOTORS.
- Disconnect and reconnect 3-pin connector at distributor. If ohmmeter now indicates 400-800 ohms, go to step 6). If ohmmeter reading is still incorrect, disconnect 3-pin connector at distributor and go to next step.
- Connect ohmmeter between terminals B2 and B3 of distributor connector. If ohmmeter indicates 400-800 ohms, repair or replace harness between 3-pin connector and 4-pin connector. If ohmmeter reading is still incorrect, replace pick-up coil.
- Connect ohmmeter between battery negative terminal and terminal "B" (Black wire) of ignition module 4-pin wiring harness connector. If ohmmeter reads zero (not more than .002 ohms), go back to step 2). If ohmmeter reading is more than zero, repair ground circuit. Check resistance at ground cable, distributor-to-engine block and ground screw in distributor
- Connect voltmeter between terminals "C" and "D" at ignition module wiring harness connector. Crank engine and observe voltmeter. If voltmeter fluctuates, sensor and ignition module are operating properly.
- If voltmeter does not fluctuate locate and repair fault. Check distributor trigger wheel, check for missing trigger wheel pin and for a distributor shaft that is not turning.