Dodge ZB 2005 Service Manual page 1276

P1391-INTERMITTENT LOSS OF CMP OR CKP —
TEST
7 Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Ensure the Crankshaft Position Sensor and the Camshaft Position Sensor are
properly installed and the mounting bolt(s) are torqued to specification.
Refer to any TSB that may apply.
Were any of the above conditions present?
Yes → Repair as necessary
→ Go To 8
No
8 Remove the Crankshaft Position Sensor.
Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive
movement.
Were any problems found?
Yes → Repair or replace the Tone Wheel/Flex Plate as necessary.
→ Go To 9
No
9 If there are no possible causes remaining, view repair.
Repair
10 NOTE: The conditions that set this DTC are not present at this time. The
following test may help in identifying the intermittent condition.
Turn the ignition off.
With the DRBIII as a Dual Channel Lab Scope and the Miller special tool #6801,
backprobe the (K24) CKP Signal circuit in the PCM harness connector and CKP
harness connector.
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.
Start the engine.
Carefully wiggle the related wire harness and gently tap on the CKP sensor.
Compare the Channel 1 reading to the Channel 2 reading on the lab scope screen.
Both of the readings should be the same.
Were any of the above conditions present?
Yes → Repair the wiring or connector concern.
→ Test Complete.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace the Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
Continued
155
APPLICABILITY
All
All
All
All