Test Description
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Verifies short to ground is not present in spark reference circuit, or an open is not present in ignition jumper harness.
- Ignition control module will ground spark reference signal if a window on harmonic balancer is interfacing with 18X Hall Effect switch. Starter may have to be bumped several times to obtain a voltage reading.
- Voltage reading should be lower than that obtained with engine not running, indicating a pulsed reference signal.