P1391 Diagnostic Trouble Code Discussion for August 2015
CKP Or CMP Sensor Signal Intermittent
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| Help Request | Posted | |
| 2000 Jeep Grand Cherokee Laredo 4.7L Excessive Emissions, Hesitation, Misfire, MIL Lamp on VIN: 1J4GW48N6Y P1391: CKP Or CMP Sensor Signal Intermittent. I used a lab scope and monitored the cam and crank sensor signals triggering off of #1 cylinder and compared to wave forms in library. Engine appears to be 1 tooth off according to scope and library wave forms. Customer took car back and removed covers. Sent m... |
August 05, 2015 | |
| 1999 Jeep Cherokee Sport 4.0L MIL Lamp on VIN: 1J4FF68SXX P1391: CKP Or CMP Sensor Signal Intermittent. ... causing me fits. After about a 10 mile drive the MIL will set with a P1391. Vehicle came in with P1391 P0320 P0340. Backprobe ckp and cmp signals at pcm found ckp good and clean cmp very dirty not a good square wave at all. Installed a AM dist due to the s... |
August 13, 2015 |
