DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 86

DRIVEABILITY - DIESEL
P0340-CMP/CKP POSITION SENSOR CIRCUIT - SIGNAL FREQUENCY
TOO HIGH —
Continued
TEST
1 NOTE: The Timing Belt must be correctly installed and operational before
diagnosis can be made. Refer to the Service Information to ensure the
timing belt is properly installed.
Turn the ignition on.
With the DRBIII , erase the ECM DTCs.
Attempt to start the engine.
With the DRBIII , read the ECM DTCs.
Does the DRBIII display this DTC?
Yes → Go To 3
→ Go To 2
No
2 Turn the ignition on.
With the DRBIII , erase the ECM DTCs.
Test drive the vehicle.
With the DRBIII , read the ECM DTCs.
Does the DRBIII display this DTC?
Yes → Go To 3
→ Go To 13
No
3 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
CMP Sensor harness connector.
Does the test light illuminate brightly?
Yes → Go To 4
→ Repair the ASD Relay Output circuit for an open.
No
4 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CMP Sensor Signal circuit.
Is the voltage above 10.0 volts?
Yes → Go To 5
→ Go To 10
No
5 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the CMP Sensor Signal circuit.
Is the test light on?
Yes → Repair the CMP Sensor Signal circuit for a short to voltage.
→ Go To 6
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
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APPLICABILITY
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