Pcm Code P023 - Ignition Control Circuit Problem: Action
PCM turns on SERVICE ENGINE SOON light and will not enable spark timing control. Engine will start and run on base timing. PCM disables EGR solenoid.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- When circuit No. 423 is shorted to ground, engine will have a long crank and hard start condition. When PCM detects grounded circuit, by-pass line will be shifted low.
- With only distributor reference (distributor reference ground jumpered), engine will run on back-up spark control. This checks for proper ground connections between PCM and engine and between PCM and ignition control module.
- This ensures PCM provides an ignition control output signal over circuit No. 423.
- This checks if ignition control module can ground ignition control signal with an open by-pass circuit.
- This checks if ignition control module can recognize a voltage on by-pass circuit and stop grounding ignition control (PCM-controlled timing).
- This checks for by-pass signal to module. If by-pass signal is being sent by PCM to ignition control and if module is interpreting by-pass voltage correctly, module will switch off ground to ignition control.
- Fault may exist in 6-way connector. Check connector and terminals for damage. If connector is okay, plug in connector, and retest for PCM Code P023.