DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 88

DRIVEABILITY - DIESEL
P0340-CMP/CKP POSITION SENSOR CIRCUIT - SIGNAL FREQUENCY
TOO HIGH —
Continued
TEST
10 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the CMP Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes → Go To 11
→ Repair the CMP Sensor Signal circuit for an open
No
11 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the CMP Sensor Signal circuit.
Is the resistance below 1000 ohms?
Yes → Repair the CMP Sensor Signal circuit for a short to ground.
→ Go To 12
No
12 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the CMP Sensor Signal circuit and the Sensor
Ground circuit at the CMP Sensor harness connector.
Is the resistance below 1000 ohms?
Yes → Repair the CMP Sensor Signal and Sensor Ground circuits for a
→ Replace and program the Engine Control Module in accordance
No
13 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.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Remove the CMP Sensor and the CKP Sensor, checking for loose mounting screws
and debris on the sensor magnets that can corrupt the sensor signal.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary.
→ Test Complete.
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
short together.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
80
APPLICABILITY
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