Jeep Liberty KJ. Manual — part 594
2.
(A1) B+ CIRCUIT HIGH RESISTANCE
WARNING: When the engine is operating, do not stand in direct
line with the fan. Do not put your hands near the pulleys, belts, or
fan. Do not wear loose clothing. Failure to follow these instruc-
tions can result in personal injury or death.
NOTE: Make sure all wires are clear of the engine’s moving parts.
Measure the voltage between the (A1) B+ Terminal at the Generator
and the Battery + Post.
Start the engine.
Is the voltage above 0.4 of a volt?
Yes
>> Repair the excessive resistance in the (A1) B+ circuit
between the Generator and Battery.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
3.
GENERATOR CASE GROUND HIGH RESISTANCE
Ignition on, engine not running.
Start the engine.
Allow the engine to reach normal operating temperature.
NOTE: Make sure all wires are clear of the engine’s moving parts.
Measure the voltage between the Generator case and Battery ground post.
Is the voltage above 0.1 of a volt?
Yes
>> Repair excessive resistance in the Generator Ground between the Generator Case and Battery ground
side.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
GENERATOR OPERATION
Turn the ignition off.
Disconnect the Generator Field harness connector.
Using a 12-volt test light, jump it across the Generator Field harness
connector.
Ignition on, engine not running.
With the scan tool, actuate the Gen Field Control circuit.
Does the test light illuminate brightly and flash on and off?
Yes
>> Replace the Generator.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
5.
(K125) GENERATOR FIELD CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K125) Gen Field Con-
trol circuit in the Generator Field harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K125) Gen Field Control
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(Z932) GROUND CIRCUIT OPEN
Using a 12-volt test light connected to 12-volts, probe the (Z932)
Ground circuit in the Generator Field harness connector.
Does the test light illuminate brightly?
Yes
>> Go To 7
No
>> Repair the open in the (Z932) Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
7.
(K125) GENERATOR FIELD CONTROL CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage
the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform
diagnosis.
Measure the resistance of the (K125) Gen Field Control circuit from the Generator harness connector to the appro-
priate terminal of the special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 8
No
>> Repair the open in the (K125) Gen Field Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 435
8.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
P0563-BATTERY VOLTAGE HIGH
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 437
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