2000 XJ Sport p1391 - JeepForum.com

 
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post #1 of 2 Old 04-17-2017, 02:36 PM Thread Starter
mattadams05tj
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2005 TJ Wrangler 
 
Join Date: May 2011
Location: Pennsdale
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2000 XJ Sport p1391

Keep getting an intermittent p1391 code, I've replaced the crank sensor with a factory Mopar one. I have also replaced the cam sensor and drive with a dorman one.

It also occasionally throws the p0351,0352,0353 coil codes.

I put a new set of NGK plugs in it and it was better for a few days.

I'm waiting for the local yard to get back to me about another coil rail just to eliminate that as a possibility.

Any suggestions on what else to check?

I'm soon going to go have to go to a dealer and get cam sensor synced and possibly the wires scoped.

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post #2 of 2 Old 04-17-2017, 05:55 PM
CJ7-Tim
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P1391 - Intermittent Loss of CMP or CKP Signal. Loss of the Cam Position Sensor or Crank Position sensor signal has occurred.

P1391 – Possible symptoms:
(1) random misfire/stumble/stalling, often over bumps or right turns and when going into reverse.
(2) shorted out the Fuel pump/ECU power wire.

Possible causes
- Faulty CamshaftPosition (CMP) Sensor
- Camshaft Position (CMP) Sensor harness is open or shorted
- Camshaft Position (CMP) Sensor circuit poor electrical connection.

Symptoms:

CMP SENSOR OUT OF SYNC
-DAMAGED TONE WHEEL/FLEX PLATE (CRANKSHAFT)
-DAMAGED TONE WHEEL/PULSE RING (CAMSHAFT)
-IRREGULAR LAB SCOPE PATTERN OF CMP SIGNAL

INTERMITTENT CKP SIGNAL LOSS WHEN WIRING IS WIGGLED
-IRREGULAR LAB SCOPE PATTERN OF CKP SIGNAL
-WIRING HARNESS INTERMITTENT

INTERMITTENT CMP SIGNAL LOSS WHEN WIRING IS WIGGLED
-SENSOR CONNECTOR/WIRING
-CAMSHAFT POSITION SENSOR
-CKP SENSOR CONNECTOR/WIRING
-CRANKSHAFT POSITION SENSOR

Potential Fixes:

Fix #1:
Inspect your wire harnesses for damaged wires, chafed insulation, or failed wire splices. Use a volts/ohms multi-meter to check the resistance of the ground wire circuits from each sensor. Replace corroded ground wires/connectors and clean ground wire connection points.


Fix #2:
Timing may off. Re-index the distributor/cam sensor per the FSM instructions, or replace faulty distributor/cam sensor pickup module.
Google Scan Tools, O-Scopes and Toothpicks, and read the article.

A mis-indexed distributor/cam sensor may exhibit surging, light bucking or intermittent engine misfiring. This will most likely occur when the vehicle is at operating temperature and under a light load at approximately 2,000 rpm. The proper indexing procedure must be used as outlined in the Jeep Service Manual.

.

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