Dodge ZB 2005 Service Manual page 1225

DRIVEABILITY - GAS
P0340-NO CAM REFERENCE SIGNAL AT PCM —
TEST
14 NOTE: The following tests may help in identifying a possible intermittent
condition with the Cam 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 (K44) CMP Signal circuit in the Cam 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 Cam Sensor and wiggle the CMP Sensor connector and wire
harness.
Observe the lab scope screen.
Look 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
→ Go To 15
No
15 NOTE: An intermittent Crank Position Sensor failure may cause the P0340
code to set.
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 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
→ Test Complete.
No
ACTION
necessary, if ok, replace the Cam Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
necessary, if ok, replace the Crank Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
104
APPLICABILITY
All
All