Jeep XJ. Manual — part 814
TEST
ACTION
APPLICABILITY
3
Ignition on, engine not running.
Record all DTC’s and freeze frame data, now erase Codes.
Carefully inspect all Connectors for corrosion or spread Terminals before continuing.
With the DRBIII
t actuate the Generator Field Driver Circuit.
Backprobe the Generator Field Source (+) Circuit at back of Generator.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the open Generator Field Source (+) Circuit from Gener-
ator.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
4
Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the Generator Field harness connector.
Measure the Generator Field Driver Circuit from PCM Connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Generator Field Driver Circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
5
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Generator Field harness connector.
Note: Check Connectors - Clean/repair as necessary.
Measure the Generator Field Driver Circuit from PCM to Generator.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Generator Field Driver Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
6
Turn the ignition off.
Disconnect the Generator Field harness connector at back of the Generator.
Note: Check connectors - Clean/repair as necessary.
Measure resistance across the Generator Field Terminals at the Generator.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Generator as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
17
CHARGING
P0622-GENERATOR FIELD NOT SWITCHING PROPERLY —
Continued
Symptom:
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH
When Monitored and Set Condition:
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH
When Monitored:
With the ignition key on.
Set Condition:
The PCM senses the voltage from the AMBIENT/BATT temperature
sensor to be above 4.9 volts for 3 seconds.
POSSIBLE CAUSES
SENSOR GROUND CIRCUIT OPEN
AMBIENT/BATT SIGNAL CIRCUIT SHORTED TO VOLTAGE
AMBIENT/BATT SIGNAL CIRCUIT OPEN
AMBIENT/BATT TEMPERATURE SENSOR
PCM
WIRING HARNESS INTERMITTENT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the DTC Good Trip Counter displayed and equal to zero for P1492?
All
Yes
→
No
→
2
Turn the ignition off. Disconnect the AMBIENT/BATT Temperature Sensor harness
connector.
Measure the resistance between the Sensor Ground circuit and ground at the
AMBIENT/BATT Temperature Sensor connector.
Is the resistance below 5.0 ohms?
All
No
→
Repair the open Sensor Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Yes
→
3
Turn the ignition off. Disconnect the AMBIENT/BATT connector. Start the engine.
Allow engine to idle.
Measure the AMBIENT/BATT Signal circuit voltage at the AMBIENT/BATT connec-
tor.
Is the voltage above 5.5 volts?
All
Yes
→
Repair the short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
18
CHARGING
TEST
ACTION
APPLICABILITY
4
Turn the ignition off. Disconnect the AMBIENT/BATT connector. Disconnect the
PCM harness connector(s).
Measure the resistance of the AMBIENT/BATT Signal circuit from the AMBIENT/
BATT connector to the PCM connector.
Is the resistance below 5.0 ohms?
All
No
→
Repair the open circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Yes
→
5
Turn the ignition off. Disconnect the AMBIENT/BATT Temperature Sensor connec-
tor. Turn the ignition on.
With the DRBIII
t in sensors, read the 9Ambient/Bat Tmp Vlt9 value. Connect a
jumper wire between the AMB/BATT Signal circuit and the Sensor Ground circuit at
the AMB/BATT connector. Voltage should change from greater than 4.5 volts to less
than 1.0 volt.
Did the
9Ambient/Bat Tmp Vlt9 value change from greater than 4.5 volts to less than
1.0 volt?
All
Yes
→
Replace the AMBIENT/BATT Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
6
If there are no possible causes remaining, view repair.
View repair options.
All
Repair
Replace the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
7
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Test Complete.
19
CHARGING
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH —
Continued
Symptom:
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW
When Monitored and Set Condition:
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW
When Monitored:
With the ignition on.
Set Condition:
The PCM senses the voltage from the AMBIENT/BATT temperature
sensor to be below 0.5 volt for 3 seconds.
POSSIBLE CAUSES
AMBIENT/BATT TEMP SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIR-
CUIT
AMBIENT/BATT TEMPERATURE SIGNAL CIRCUIT SHORTED TO GROUND
AMBIENT/BATT TEMPERATURE SENSOR
PCM
WIRING HARNESS INTERMITTENT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the DTC Specific Good Trip Counter displayed and equal to zero for P1493?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t in sensors, read the 9Ambient/Bat Tmp Vlt9 value. Disconnect the
AMBIENT/BATT Temperature Sensor connector.
Did the
9Ambient/Bat Tmp Vlt9 value change from below 1.0 volt to above 4.5 volts?
All
Yes
→
Replace the AMBIENT/BATT Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
3
Turn the ignition off. Disconnect the AMBIENT/BATT connector. Disconnect the
PCM harness connector(s).
Measure the AMBIENT/BATT temperature sensor Signal circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
20
CHARGING
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