Jeep XJ. Manual — part 590
Symptom:
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH - DIESEL
When Monitored and Set Condition:
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH - DIESEL
When Monitored:
With the ignition on.
Set Condition:
The PCM detects voltage on the ambient/battery temperature sensor
signal circuit above 4.94 volts for more than 3 seconds.
POSSIBLE CAUSES
POWERTRAIN CONTROL MODULE (SHORTED TO VOLTAGE INTERNALLY)
INTERMITTENT CONDITION
AMB/BATT TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
AMBIENT/BATTERY TEMPERATURE SENSOR
AMBIENT/BATTERY TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
AMBIENT/BATTERY TEMPERATURE SENSOR GROUND CIRCUIT OPEN
POWERTRAIN CONTROL MODULE (OPEN INTERNALLY)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase PCM DTCs.
Cycle the ignition on for five seconds, then off for five seconds, several times.
With the DRB, read PCM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Ambient/Battery Temperature Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Ambient/Battery Temperature Sensor
Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→
No
→
12
CHARGING
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Ambient/Battery Temperature Sensor harness connector.
Disconnect the PCM 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.
Measure the voltage between ground and the Amb/Batt Temp Sensor Signal 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 CHARGING VERIFICATION - VER-3.
No
→
Repair the Ambient/Battery Temperature Sensor Signal circuit
for a short to voltage.
Perform CHARGING VERIFICATION - VER-3.
4
Turn the ignition off.
Disconnect the Ambient/Battery Temperature Sensor harness connector.
Measure the resistance of the Amb/Batt Temp Sensor.
Is the resistance above 100 kohms?
All
Yes
→
Replace the Ambient/Battery Temperature Sensor.
Perform CHARGING VERIFICATION - VER-3.
No
→
5
Turn the ignition off.
Disconnect the Ambient/Battery Temperature Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Amb/Batt Temp Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ambient/Battery Temperature Sensor Signal circuit
for an open.
Perform CHARGING VERIFICATION - VER-3.
6
Turn the ignition off.
Disconnect the Ambient/Battery Temperature Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Amb/Batt Temp Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ambient/Battery Temperature Sensor Ground circuit
for an open.
Perform CHARGING VERIFICATION - VER-3.
7
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 CHARGING VERIFICATION - VER-3.
13
CHARGING
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH - DIESEL —
Continued
TEST
ACTION
APPLICABILITY
8
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 CHARGING VERIFICATION - VER-3.
No
→
Test Complete.
14
CHARGING
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH - DIESEL —
Continued
Symptom:
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW - DIESEL
When Monitored and Set Condition:
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW - DIESEL
When Monitored:
With the ignition on.
Set Condition:
The PCM detects voltage on the ambient/battery temperature sensor
signal circuit below 0.08 volt for more than 3 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
AMBIENT/BATTERY TEMPERATURE SENSOR
AMBIENT/BATTERY TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
AMB/BATT TEMP SENSOR SIGNAL AND SENSOR GROUND CIRCUITS SHORTED TOGETHER
POWERTRAIN CONTROL MODULE (SHORT TO GROUND INTERNALLY)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, read the voltage of the Ambient/Battery Temperature Sensor.
Is the voltage below 0.4 volt?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Ambient/Battery Temperature Sensor harness connector.
Turn the ignition on.
With the DRB, read the voltage of the Ambient/Battery Temperature Sensor.
Is the voltage above 4.0 volts?
All
Yes
→
Replace the Ambient/Battery Temperature Sensor.
Perform CHARGING VERIFICATION - VER-3.
No
→
3
Turn the ignition off.
Disconnect the Ambient/Battery Temperature Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the Amb/Batt Temp Sensor Signal
circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Ambient/Battery Temperature Sensor Signal circuit
for a short to ground.
Perform CHARGING VERIFICATION - VER-3.
15
CHARGING
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