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The P1391 Intermittent Loss of CKP/CMP
Posted to Technical Theory Forum on 12/2/2018 31 Replies

[2000 Jeep Cherokee SE, ECM/Inputs/Outputs Waveform]

Oscilliscope of CMP/CKP and scan data while engine running showed no problem. Synch point was perfect. Wave forms perfect. Yet P1391 randomly presented. Nothing seemed out of line to our seat of the pants.... Login to read more.

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car Vehicle Data

2000 Jeep Cherokee Sport 4.0L

Engine4.0 L
Trans4-speed Automatic (Electronic)

car Vehicle Data

2000 Jeep Cherokee Sport 4.0L

Engine4.0 L
Trans4-speed Automatic (Electronic)