Jeep XJ. Manual — part 597
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the ECM ECT Sensor harness connector.
Measure the resistance between the ECM ECT Sensor Signal circuit and Sensor
Ground circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the ECM ECT Sensor Signal and Ground circuits for a
short together.
Perform ROAD TEST VERIFICATION - VER-2.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
6
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
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 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.
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?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
40
DRIVEABILITY - DIESEL
P0115-TEMPERATURE OF ENGINE COOLANT SRC LOW EXCEEDED —
Continued
Symptom:
P0117-ECT SENSOR VOLTAGE TOO LOW
When Monitored and Set Condition:
P0117-ECT SENSOR VOLTAGE TOO LOW
When Monitored:
With the ignition on.
Set Condition:
The voltage on the PCM engine coolant temperature sensor signal circuit
is below 0.25 volt for more than 3 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
PCM ECT SENSOR
PCM ECT SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
PCM ECT SENSOR SIGNAL AND GROUND CIRCUITS SHORTED TOGETHER
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, monitor the PCM Engine Coolant Temperature (ECT) Sensor voltage.
Is the PCM ECT Sensor voltage below 0.25 volt?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the PCM ECT Sensor harness connector.
Turn the ignition on.
With the DRB, read the PCM ECT Sensor voltage.
Is the voltage above 4.0 volts?
All
Yes
→
Replace the PCM ECT Sensor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the PCM ECT Sensor harness connector.
Measure the resistance between ground and the PCM ECT Sensor Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the PCM ECT Sensor Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
41
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the PCM ECT Sensor harness connector.
Measure the resistance between the PCM ECT Sensor Signal circuit and Sensor
Ground circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the PCM ECT Sensor Signal and Ground circuits for a
short together.
Perform ROAD TEST VERIFICATION - VER-2.
5
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.
6
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
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 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.
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?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
42
DRIVEABILITY - DIESEL
P0117-ECT SENSOR VOLTAGE TOO LOW —
Continued
Symptom:
P0118-ECT SENSOR VOLTAGE TOO HIGH
When Monitored and Set Condition:
P0118-ECT SENSOR VOLTAGE TOO HIGH
When Monitored:
With the ignition on.
Set Condition:
The voltage on the PCM engine coolant temperature sensor signal circuit
is above 4.9 volts for more than 3 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
PCM ECT SENSOR GROUND CIRCUIT OPEN
PCM ECT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
PCM ECT SENSOR
PCM ECT SENSOR SIGNAL CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, monitor the PCM Engine Coolant Temperature (ECT) Sensor voltage.
Is the PCM ECT Sensor voltage above 4.98 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the PCM ECT Sensor harness connector.
Turn the ignition on.
Measure the voltage on the PCM ECT Sensor Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→
Repair the PCM ECT Sensor Signal circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the PCM ECT Sensor harness connector.
Connect a jumper wire between the PCM ECT Sensor harness connector cavities.
Turn the ignition on.
With the DRB, read the PCM ECT Sensor voltage.
Is the voltage below 1.0 volt?
All
Yes
→
Replace the PCM ECT Sensor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
43
DRIVEABILITY - DIESEL
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