Jeep XJ. Manual — part 592
TEST
ACTION
APPLICABILITY
3
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.
20
CHARGING
P1600-BATTERY VOLTAGE SRC HIGH EXCEEDED - DIESEL —
Continued
Symptom List:
P1682-CHARGING SYSTEM VOLTAGE TOO LOW - DIESEL
*CHECKING THE CHARGING SYSTEM OPERATION - DIESEL
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1682-CHARGING SYSTEM
VOLTAGE TOO LOW - DIESEL.
When Monitored and Set Condition:
P1682-CHARGING SYSTEM VOLTAGE TOO LOW - DIESEL
When Monitored:
With the engine running.
Set Condition:
The voltage at PCM cavity C1-22 is 0.5 volt or more below the target
charging voltage for at least 3 seconds.
POSSIBLE CAUSES
CHECK FOR CYCLING VOLTAGE ON THE GENERATOR FIELD DRIVER CIRCUIT
INTERMITTENT CONDITION
GENERATOR BELT CONDITION OR TENSION
HIGH RESISTANCE IN THE FUSED B+ CIRCUIT TO THE PCM
GENERATOR FIELD DRIVER CIRCUIT SHORTED TO VOLTAGE
GENERATOR FUSED B+ CIRCUIT HIGH RESISTANCE
ASD RELAY OUTPUT CIRCUIT OPEN
GENERATOR GROUND CIRCUIT HIGH RESISTANCE
GENERATOR FIELD DRIVER CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: Inspect the vehicle for aftermarket accessories that may exceed the
Generator capacity.
NOTE: The battery must be fully charged before continuing.
Inspect the generator belt condition and tension.
Is the generator belt in good condition and tensioned properly?
All
Yes
→
No
→
Repair as necessary.
Perform CHARGING VERIFICATION - VER-3.
21
CHARGING
TEST
ACTION
APPLICABILITY
2
Turn the ignition on.
With the DRB, actuate the Generator Field.
Measure the voltage between ground and the Generator Field Driver circuit by back
probing the Generator Field harness connector with a voltmeter.
NOTE: The voltage should cycle from Battery voltage to below 2.0 volts
every 1.4 seconds.
While monitoring the voltmeter, wiggle the generator field harness and connectors
between the generator, PCM and the ASD/Diesel Power Relay (in the PDC).
Was there any interruption of the normal voltage cycling?
All
Yes
→
Repair the harness as necessary where the wiggling caused the
interruption.
Perform CHARGING VERIFICATION - VER-3.
No
→
NOTE: With the DRB, stop the Generator Field actuation.
3
Connect the positive lead of a voltmeter to the generator B+ (12V) terminal and the
negative lead to the battery positive (+) post.
WARNING: KEEP EVERYTHING CLEAR OF THE ENGINE’S MOVING
PARTS.
Start the engine.
Is the voltage on the voltmeter below 0.4 volt?
All
Yes
→
No
→
Repair the Generator Fused B+ circuit for high resistance.
Perform CHARGING VERIFICATION - VER-3.
4
Connect the positive lead of a voltmeter to the generator case (housing) and the
negative lead to the battery negative (-) post.
WARNING: KEEP EVERYTHING CLEAR OF THE ENGINE’S MOVING
PARTS.
Start the engine.
Is the voltage on the voltmeter below 0.4 volt?
All
Yes
→
No
→
Repair the Generator Ground circuit for high resistance.
Perform CHARGING VERIFICATION - VER-3.
5
Turn the ignition off, then on.
With the DRB, read and record the Battery Voltage.
With a voltmeter, measure and record the voltage between the Battery terminals.
Compare the DRB Battery Voltage reading to the voltmeter reading.
Is the difference between the two readings less than 0.5 volt?
All
Yes
→
No
→
22
CHARGING
P1682-CHARGING SYSTEM VOLTAGE TOO LOW - DIESEL —
Continued
TEST
ACTION
APPLICABILITY
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 CHARGING VERIFICATION - VER-3.
No
→
Test Complete.
7
Turn the ignition off.
With a voltmeter, measure and record the voltage between the Battery terminals.
Disconnect the PCM harness connectors.
Measure the voltage of the Fused B+ circuit in the PCM C1 harness connector.
Are the voltage measurements within 0.5 volt of each other?
All
Yes
→
No
→
Repair the Fused B+ circuit to the Powertrain Control Module for
high resistance.
Perform CHARGING VERIFICATION - VER-3.
8
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Generator Field harness connector.
Turn the ignition on.
Measure the voltage of the Generator Field Driver circuit.
Is the voltage below 0.5 volt?
All
Yes
→
No
→
Repair the Generator Field Driver circuit for a short to voltage.
Perform CHARGING VERIFICATION - VER-3.
9
Turn the ignition off.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the ASD Relay Output circuit in PCM harness connector C3,
cavity 12.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the ASD Relay Output circuit for an open.
Perform CHARGING VERIFICATION - VER-3.
23
CHARGING
P1682-CHARGING SYSTEM VOLTAGE TOO LOW - DIESEL —
Continued
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