DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 83

P0340-CMP/CKP POSITION SENSOR CIRCUIT - CMP/CKP SYNC FAIL -
URE —
Continued
TEST
4 Turn the ignition off.
Remove the CKP Sensor.
Inspect the Crankshaft Position Sensor for conditions such as loose mounting screws,
damage or debris.
Is there any evidence of these conditions?
Yes → Repair as necessary.
→ Go To 5
No
5 Turn the ignition off.
Using the DRB lab scope, backprobe the CMP Sensor Signal circuit at the CMP
Sensor harness connector.
Start the engine, if the engine will not start, crank the engine for several seconds
while monitoring the DRB.
NOTE: Refer to Charts and Graphs to view a correct CMP Sensor signal.
Does the DRB display a steady clean CMP Signal pattern?
Yes → Go To 6
→ Perform Test for DTC P0340-Camshaft Position Sensor Circuit
No
6 Turn the ignition off.
Using the DRB lab scope, backprobe both of the CKP Sensor Signal circuits at the
CKP Sensor harness connector.
NOTE: Refer to Charts and Graphs to view a correct CKP Sensor signal.
Start the engine, if the engine will not start, crank the engine for several seconds
while monitoring the DRB.
Does the DRB display a steady clean CKP Signal pattern for each circuit?
Yes → Go To 7
→ Perform Test for DTC P0340-Crankshaft Position Sensor Circuit
No
7 Refer to the Service Information and check alignment of the camshaft sprocket,
crankshaft sprocket and injection pump sprocket.
Are all of the sprockets aligned correctly?
Yes → Replace and program the Engine Control Module in accordance
→ Repair or adjust as necessary.
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Static Plausibility.
Perform ROAD TEST VERIFICATION - VER-2.
Dynamic Plausibility.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
75
APPLICABILITY
All
All
All
All