Dodge ZB 2005 Service Manual page 1274

Symptom:
P1391-INTERMITTENT LOSS OF CMP OR CKP
When Monitored and Set Condition:
P1391-INTERMITTENT LOSS OF CMP OR CKP
When Monitored: Engine running or cranking.
Set Condition: When the failure counter reaches 20 for 2 consecutive trips.
GOOD TRIP EQUAL TO ZERO
CMP WIRE HARNESS INSPECTION
TONE WHEEL/PULSE RING INSPECTION
CKP WIRE HARNESS INSPECTION
TONE WHEEL/PULSE RING INSPECTION
CHECKING INTERMITTENT CKP SIGNAL WITH LAB SCOPE
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
TEST
1 Ignition on, engine not running.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
With the DRBIII , read DTCs and record the related Freeze Frame data.
Start the engine and run until operating temp is reached. (Closed Loop)
If the DTC does not return right away it may be necessary to test drive the vehicle
to duplicate the DTC.
Does the P1391 return?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
No
POSSIBLE CAUSES
ACTION
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
153
APPLICABILITY
All