Jeep Liberty KJ. Manual — part 593
3.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C2 BCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (C18) A/C Pressure Signal circuit in the A/C
Pressure Transducer harness connector.
Is the voltage above 5.2 volts?
Yes
>> Repair the short to battery voltage in the (C18) A/C Pres-
sure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (C18) A/C Pressure Signal circuit from
the A/C Pressure Transducer harness connector to the C2 BCM har-
ness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
5.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K301) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (C18) A/C Pressure Signal circuit
and the (K301) 5-volt Supply circuit in the A/C Pressure Transducer har-
ness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (K301) 5-volt Supply circuit
and the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(K310) SENSOR GROUND CIRCUIT OPEN
Disconnect the C2 BCM harness connector.
Measure the resistance of the (K310) Sensor ground circuit from the
A/C Pressure Sensor harness connector to the C2 BCM harness con-
nector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K310) Sensor ground circuit
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
7.
BCM
NOTE: Before continuing, check the BCM 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 BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES - STANDARD PROCEDURE)
No
>> Replace and program the Body Control Module per Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 431
P0562-BATTERY VOLTAGE LOW
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
The engine running. The engine speed greater than 1000 RPM.
•
Set Condition:
Battery voltage is 1 volt less than desired voltage for a set period of time. One Trip Fault.
Possible Causes
RESISTANCE IN THE (A1) BATTERY POSITIVE CIRCUIT
RESISTANCE IN THE GENERATOR CASE GROUND
(K125) GENERATOR FIELD CONTROL CIRCUIT OPEN
(K125) GENERATOR FIELD CONTROL CIRCUIT SHORTED TO GROUND
OPEN FUSE LINK
(Z932) GROUND CIRCUIT OPEN
GENERATOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
NOTE: Make sure the Battery is in good condition. Using the Midtronics Battery Tester, test the Battery
before continuing.
NOTE: Inspect the vehicle for after market accessories that may exceed the Generator System output.
Turn the ignition off.
NOTE: Make sure the generator drive belt is in good operating condition.
NOTE: Inspect the fuses in the IPM. If an open fuse is found, use the wire diagram/schematic as a guide,
inspect the wiring and connectors for damage.
Ignition on, engine not running.
With the scan tool, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 433
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