Jeep Grand Cherokee WK. Manual — part 958
P0339-CRANKSHAFT POSITION SENSOR INTERMITTENT (CONTINUED)
10.
(K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K24) CKP Signal cir-
cuit in the CKP Sensor harness connector.
Wiggle the related wire harness while monitoring the resistance value.
Does the resistance ever go below 100 ohms?
Yes
>> Repair the short to ground in the (K24) Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 11
11.
(K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (F855) 5-volt Supply circuit and
the (K24) CKP Signal circuit in the CKP harness connector.
Wiggle the related wire harness while taking this measurement.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (F855) 5-volt Supply circuit
and the (K24) CKP Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 12
9 - 428
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0339-CRANKSHAFT POSITION SENSOR INTERMITTENT (CONTINUED)
12.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 429
P0340-CAMSHAFT POSITION SENSOR CIRCUIT
9 - 430
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0340-CAMSHAFT POSITION SENSOR CIRCUIT (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
During engine cranking and with the engine running. Battery voltage greater than 10 volts.
•
Set Condition:
At least 5 seconds or 2.5 engine revolutions have elapsed with crankshaft position sensor signals present but
no camshaft position sensor signal. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K44) CMP SIGNAL CIRCUIT OPEN
(K44) CMP SIGNAL CIRCUIT SHORTED GROUND
(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
(K900) SENSOR GROUND CIRCUIT OPEN
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
Crank the engine.
Ignition on, engine not running.
With a scan tool read the DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Go To 14
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 431
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