P1357 Ignition Diagnostic Monitor Pulsewidth Not Defined
What does P1357 mean on a Ford?
P1357 — Ignition Diagnostic Monitor Pulsewidth Not Defined. This Ford-enhanced code applies to F-150, Mustang, Ranger with EDIS ignition.
Common causes of P1357
- Aftermarket ignition components confusing the monitor
- Failing ignition module with erratic pulsewidth
- Corrupted PCM calibration
- Wiring fault distorting the IDM signal
- Failing coil pack
How to fix P1357
- Return ignition parts to stock for diagnosis
- Check for spark on all cylinders
- Inspect IDM wiring
- Verify PCM calibration level
- Replace the module or coil per signal tests