Jeep XJ. Manual — part 837
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CMP Sensor Signal circuit in the CMP Sensor harness
connector.
Is the voltage above 5.0 volts?
All
Yes
→
Repair the CMP Sensor Signal circuit for a short to battery
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
13
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Measure the resistance between the CMP Sensor Signal circuit and the 5 Volt Supply
circuit in the CMP Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the CMP Sensor Signal circuit shorted to the 5 Volt Supply
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
14
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
15
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Measure the resistance of the 5 Volt Supply circuit in the CMP Sensor harness
connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the 5 Volt Supply circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
16
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit between the CMP Sensor harness
connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
109
DRIVEABILITY - GAS
P0340-NO CAM SIGNAL AT PCM —
Continued
TEST
ACTION
APPLICABILITY
17
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 5 Volt Supply circuit in the CMP Sensor harness
connector.
Is the voltage above 5.5 volts?
All
Yes
→
Repair the 5 Volt Supply circuit for a short to battery voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
18
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
110
DRIVEABILITY - GAS
P0340-NO CAM SIGNAL AT PCM —
Continued
Symptom:
P0351-IGNITION COIL # 1 PRIMARY CIRCUIT
When Monitored and Set Condition:
P0351-IGNITION COIL # 1 PRIMARY CIRCUIT
When Monitored:
With battery voltage greater than 8 volts during engine cranking or
greater than 12 volts with engine running, engine rpm less than 2016, and none of the coils
in dwell when checked.
Set Condition:
Peak current is not achieved with battery based dwell plus 1.5 msec of
diagnostic offset. It takes less than 3 seconds during cranking or up to 6 seconds while
running to set.
POSSIBLE CAUSES
OPEN/HIGH RESISTANCE IN THE ASD RELAY OUTPUT CIRCUIT
IGNITION COIL NO. 1 DRIVER CIRCUIT OPEN
COIL RAIL
IGNITION COIL NO. 1 DRIVER CIRCUIT SHORTED TO GROUND
WIRING HARNESS INTERMITTENT
POWERTRAIN CONTROL MODULE (IGNITION COIL NO. 1 DRIVER)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter displayed and equal to zero for P0351?
4.0L MPI I-6
Yes
→
No
→
2
Turn the ignition off.
Disconnect the coil rail harness connector.
Note: The following resistance measurement should be taken at 70-80
degrees F.
Measure the primary resistance of the coil rail.
Is the resistance between 0.6 and 0.9 ohms?
4.0L MPI I-6
Yes
→
No
→
Replace the coil rail.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
111
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the coil rail harness connector.
Turn the ignition on.
With the DRBIII
t, actuate the generator field.
Using a 12-volt test light connected to ground, check the ASD relay output circuit at
the coil rail harness connector.
Does the test light illuminate brightly?
4.0L MPI I-6
Yes
→
No
→
Repair the open/high resistance in the ASD relay output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Stop All Actuations
4
Turn the ignition off.
Disconnect the coil rail harness connector.
Connect one end of a 12 volt test light to a good 12 volt source (B+).
Warning: Keep clear of the engine’s moving/rotating parts.
Check the ignition coil no. 1 driver circuit, with the other end of the test light, while
cranking the engine.
Does the test light blink/flicker?
4.0L MPI I-6
Yes
→
Test Complete.
No
→
5
Turn the ignition off.
Disconnect the coil rail harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the ignition coil no. 1 driver circuit from the ignition coil
connector to the PCM connector.
Is the resistance below 5.0 ohms?
4.0L MPI I-6
Yes
→
No
→
Repair the open ignition coil no. 1 driver circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Turn the ignition off.
Disconnect the coil rail harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance between the ignition coil no. 1 driver circuit and ground (B-).
Is the resistance below 5.0 ohms?
4.0L MPI I-6
Yes
→
Repair the ignition coil no. 1 driver circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
7
If there are no possible causes remaining, view repair.
4.0L MPI I-6
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
112
DRIVEABILITY - GAS
P0351-IGNITION COIL # 1 PRIMARY CIRCUIT —
Continued
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