Jeep XJ. Manual — part 815
TEST
ACTION
APPLICABILITY
4
Turn the ignition off. Disconnect the AMBIENT/BATT temperature sensor connector.
Disconnect the PCM harness connectors.
Measure the resistance between the AMBIENT/BATT temperature sensor Signal
circuit and the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the shorted circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
6
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.
21
CHARGING
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW —
Continued
Symptom:
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH
When Monitored and Set Condition:
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH
When Monitored:
With the ignition key on and the engine speed greater than 0 RPM.
Set Condition:
When the PCM regulates the generator field and there are no detected
field problems, but the voltage output does not decrease.
POSSIBLE CAUSES
AMBIENT/BATT TEMPERATURE SENSOR
GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND
GENERATOR FIELD SHORTED TO GROUND
AMBIENT/BATT TEMPERATURE SENSOR
POWERTRAIN CONTROL MODULE (BATTERY VOLTAGE)
POWERTRAIN CONTROL MODULE (GENERATOR RESISTANCE)
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, actuate the Generator Field Driver.
With a 12-volt test light, backprobe the Generator Field Driver Circuit in back of
Generator.
Did the light blink?
All
Yes
→
No
→
2
Ignition on, engine not running.
With the DRBIII
t, actuate the Generator Field Driver.
With DRBIII
t, stop the Generator Field Driver actuation.
With DRBIII
t, read the Target Charging voltage.
Is the Target Charging voltage above 0 volts?
All
Yes
→
No
→
3
Start the engine.
Manually set the engine speed to 1600 RPM.
With DRBIII
t, read both the Battery voltage and the Target Charging voltage.
Compare the
9Target Voltage9 to the 9Battery Voltage9 reading.
Monitor voltage for 5 minutes, if necessary. Look for a 1.0 volt difference or more.
Was there more than a 1.0 volt difference?
All
Yes
→
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Test Complete.
22
CHARGING
TEST
ACTION
APPLICABILITY
4
Ignition on, engine not running.
.With the DRBIII
t in Inputs/Outputs, read the AMBIENT/BATT temperature.
Using a thermometer measure under hood temperature near Battery tray.
Is the temperature within 10 deg of Battery temperature?
All
Yes
→
No
→
Replace AMBIENT/BATT Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the AMBIENT/BATT TEMP SENSOR.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
6
Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the Generator Field harness connector.
Measure the Generator Field Driver Circuit from PCM Harness 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
→
7
Turn the ignition off.
Disconnect the Field Harness Connector at back of the Generator.
Note: Check connectors - Clean/repair as necessary.
Measure resistance of the Generator Field Driver Circuit at the Generator to Ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair or replace the shorted Generator as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
8
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
23
CHARGING
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH —
Continued
Symptom:
P1682-CHARGING SYSTEM VOLTAGE TOO LOW
When Monitored and Set Condition:
P1682-CHARGING SYSTEM VOLTAGE TOO LOW
When Monitored:
With the ignition key on and the engine running over 1500 RPM after
25 seconds.
Set Condition:
When the PCM regulates the generator field and there are no detected
field problems, but the voltage output does not increase.
POSSIBLE CAUSES
AMBIENT/BATT TEMPERATURE SENSOR
B (+) CIRCUIT HIGH RESISTANCE
GENERATOR GROUND HIGH RESISTANCE
GENERATOR FIELD DRIVER CIRCUIT OPEN
GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND
GENERATOR FIELD SOURCE CIRCUIT SHORTED TO GROUND
GENERATOR FIELD SOURCE (+) CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Note: Battery must be fully charged.
Note: Generator Belt tension and condition must be checked before con-
tinuing.
Start the engine.
With theDRBIII
t, read the target charging voltage.
Is the target charging voltage above 15.1 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Note: Battery must be fully charged.
Note: Generator Belt tension and condition must be checked before con-
tinuing.
Start the engine. Allow the engine to reach normal operating temperature.
With the DRBIII
t in Inputs/Outputs, read the AMBIENT/BATT Temperature.
Using a Thermometer, measure under hood temperature.
Is the temperature within 10 F degrees of Battery temperature?
All
Yes
→
No
→
24
CHARGING
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