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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. So we tediously oscilliscoped - starting and stop...
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| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 4-speed AutomaticTransmission (Electronic) |
| Delivery | Fuel Injection |
| Subsystem | ECM/Inputs/Outputs |
| Component | |
| Condition | Known Good |
Vehicle Data
2000 Jeep Cherokee SE 4.0L
| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 4-speed AutomaticTransmission (Electronic) |
| Delivery | Fuel Injection |
| Subsystem | ECM/Inputs/Outputs |
| Component | |
| Condition | Known Good |
Video