Dodge ZB 2005 Service Manual page 1221

DRIVEABILITY - GAS
P0320-NO CRANK REFERENCE SIGNAL AT PCM —
TEST
14 NOTE: The following tests may help in identifying a possible intermittent
condition with the Crank Sensor or its related wire harness.
Ignition on, engine not running.
With the DRBIII as a Dual Channel Lab Scope and the Miller special tool #6801,
backprobe the (K24) CKP Signal circuit in the Crank Sensor connector and the PCM
harness connector.
Wiggle the related wire harness and connections.
Monitor the lab scope screen.
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.
Lightly tap on the Crank Sensor and wiggle the CKP Sensor connector and the
related wire harness.
Observe the lab scope screen.
Look for any erratic pulses generated by the CKP Sensor.
Did the CKP Sensor generate any erratic pulses?
Yes → Carefully inspect the wire harness and connections, repair as
→ Go To 15
No
15 NOTE: An intermittent failure with the Cam Position Sensor may cause the
P0320 code to set.
Turn the ignition off.
With the DRBIII as a Dual Channel Lab Scope and the Miller special tool #6801,
backprobe the (K44) CMP Signal circuit in the CMP Sensor connector and the PCM
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.
Ignition on, engine not running.
Wiggle the related wire harness and gently tap on the Cam Position Sensor.
Monitor the lab scope screen.
Start the engine.
Lightly tap on the CMP Sensor and wiggle the related wire harness.
Observe the lab scope screen, looking for any erratic pulses generated by the CMP
Sensor.
Did the CMP Sensor generate any erratic pulses?
Yes → Carefully inspect the wire harness and connections, repair as
→ Test Complete.
No
ACTION
necessary, if ok, replace the Crank Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
necessary, if ok, replace the Cam Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
100
Continued
APPLICABILITY
All
All