Jeep XJ. Manual — part 630
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Connect a jumper wire between the Check Engine Lamp Control circuit and ground.
Did the Check Engine Lamp illuminate?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Connect a jumper wire between the Check Engine Lamp Control circuit and ground.
With the DRB, select Body from the System menu, then Monitor CCD Bus Info.
Does the DRB display Engine Lamp Status On?
All
Yes
→
Replace the Instrument Cluster in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between ASD/Diesel Power Relay connector cavities 30 and 87
(in PDC).
Turn the ignition on.
Measure the voltage of the Check Engine Lamp Control circuit.
Is the voltage below 0.5 volt?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the Check Engine Lamp Control circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
172
DRIVEABILITY - DIESEL
*CHECKING THE CHECK ENGINE LAMP OPERATION —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Check Engine Lamp Control circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Check Engine Lamp Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance of the Check Engine Lamp Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Check Engine Lamp Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
9
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 ROAD TEST VERIFICATION - VER-2.
10
Turn the ignition off.
Remove and inspect the Check Engine Lamp bulb from the Instrument Cluster.
Is the bulb OK?
All
Yes
→
Replace the Instrument Cluster in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Check Engine Lamp bulb.
Perform ROAD TEST VERIFICATION - VER-2.
173
DRIVEABILITY - DIESEL
*CHECKING THE CHECK ENGINE LAMP OPERATION —
Continued
Symptom:
*CHECKING THE ECM AND PCM POWER AND GROUND CIR-
CUITS
POSSIBLE CAUSES
ASD RELAY OUTPUT CIRCUIT OPEN AT ECM
ASD RELAY OUTPUT OPEN AT PCM
ECM GROUND CIRCUIT OPEN
FUSED ASD BATTERY SUPPLY CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
PCM BATTERY SUPPLY CIRCUIT OPEN
PCM GROUND CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to 12-volts, check both of the ECM ground
circuits in ECM harness connector C1 cavities 1 and 27.
Did the test light illuminate for both cavities?
All
Yes
→
No
→
Repair the ECM Ground circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
2
Turn the ignition off.
Disconnect the ECM harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch
Output circuit in ECM harness connector C1 cavity 47.
Is the test light on?
All
Yes
→
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Remove the ASD/Diesel Power Relay from the PDC.
Using a 12-volt test light connected to ground, check the Fused ASD Battery Supply
circuit in ASD/Diesel Power Relay connector cavity 30.
Is the test light on?
All
Yes
→
No
→
Repair the Fused ASD Battery Supply circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
174
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 in the ASD/Diesel Power
Relay connector.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
ECM harness connector C1 cavities 2 and 28.
Did the test light illuminate for both circuits?
All
Yes
→
No
→
Repair the ASD Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
5
Disconnect the PCM harness connectors.
Using a 12-volt test light connected to ground, check the PCM Battery Supply circuit
in PCM harness connector C1 cavity 22.
Is the test light on?
All
Yes
→
No
→
Repair the PCM Battery Supply circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6
Disconnect the PCM harness connectors.
Using a 12-volt test light connected to 12-volts, check both PCM Ground circuits in
PCM harness connector C1 cavities 31 and 32.
Did the test light illuminate for both cavities?
All
Yes
→
No
→
Repair the PCM Ground circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Remove the ASD/Diesel Power Relay from the PDC.
Disconnect the PCM harness connectors.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
PCM harness connectors C1 cavity 2 and C3 cavity 12.
Did the test light illuminate for both circuits?
All
Yes
→
Test Complete.
No
→
Repair the ASD Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
175
DRIVEABILITY - DIESEL
*CHECKING THE ECM AND PCM POWER AND GROUND CIRCUITS —
Continued
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