Jeep Liberty KJ. Manual — part 1449
A/C PRESSURE SENSOR LOW (BCM)
For a complete wiring diagram Refer to Section 8W.
8E - 8
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
The Body Control Module (BCM) will set this DTC if voltage drops below 0.137 volts for more than 5 seconds
on the (C18) A/C Pressure Sensor Signal circuit.
Possible Causes
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K310) SENSOR GROUND CIRCUIT
(K301) 5-VOLT SUPPLY CIRCUIT OPEN
(K301) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K301) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K310) SENSOR GROUND CIRCUIT
A/C PRESSURE TRANSDUCER
BCM
Diagnostic Test
1.
CHECK THE A/C PRESSURE TRANSDUCER VOLTAGE
NOTE: Verify that the A/C Refrigerant System is properly charged before proceeding.
Start the engine.
With the scan tool, read the A/C Pressure Transducer voltage.
Is the voltage below 0.5 volts?
Yes
>> Go To 2
No
>> Go To 9
2.
CHECK THE (K301) 5-VOLT SUPPLY CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the A/C Pressure Transducer harness connector.
Turn the ignition on.
Measure the voltage of the (K301) 5-Volt Supply circuit.
Is the voltage above 4.5 volts?
Yes
>> Go To 3
No
>> Go To 6
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 9
3.
CHECK THE A/C PRESSURE TRANSDUCER VOLTAGE WITH THE TRANSDUCER DISCONNECTED
With the scan tool, read the A/C Pressure Transducer voltage.
Is the voltage above 0.5 of a volt?
Yes
>> Replace the A/C Pressure Transducer in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE).
No
>> Go To 4
4.
CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the BCM C2 harness connector.
Measure the resistance between ground and the (C18) A/C Pressure
Signal circuit at the A/C Pressure Transducer harness connector.
Is the resistance below 10k ohms?
Yes
>> Repair the (C18) A/C Pressure Signal circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE).
No
>> Go To 5
5.
CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO THE (K310) SENSOR GROUND
CIRCUIT
Measure the resistance between the (C18) A/C Pressure Signal circuit
and the (K310) Sensor Ground circuit at the A/C Pressure Transducer
harness connector.
Is the resistance below 10k ohms?
Yes
>> Repair the (C18) A/C Pressure Signal circuit for a short to
the (K310) Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE).
No
>> Replace and program the BCM in accordance with the Ser-
vice Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE).
8E - 10
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
6.
CHECK THE (K301) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the BCM C2 harness connector.
Measure the resistance of the (K301) 5-Volt Supply circuit between the
A/C Pressure Transducer harness connector and the BCM C2 harness
connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the (K301) 5-Volt Supply circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE).
7.
CHECK THE (K301) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (K301) 5-Volt Supply
circuit at the A/C Pressure Transducer harness connector.
Is the resistance below 10k ohms?
Yes
>> Repair the (K301) 5-Volt Supply circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE).
No
>> Go To 8
KJ
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 11
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