Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1129
P0533-A/C PRESSURE SENSOR CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
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•
When Monitored:
Engine running and the A/C Clutch Relay energized.
•
Set Condition:
The A/C pressure transducer signal at the PCM goes above 4.92 volts. One trip Fault. Three good trips to turn
off the MIL.
Possible Causes
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO (F891) 5-VOLT SUPPLY CIRCUIT
(C918) SENSOR GROUND CIRCUIT OPEN
A/C PRESSURE TRANSDUCER
FRONT CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
A/C PRESSURE TRANSDUCER VOLTAGE ABOVE 4.9 VOLTS
NOTE: Make sure the A/C refrigerant system is properly charged per Service Information.
Start the engine.
With a scan tool, read the A/C Pressure Sensor voltage.
Is the voltage above 4.9 volts?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
A/C PRESSURE TRANSDUCER
Turn the ignition off.
Disconnect the A/C Pressure Transducer harness connector.
Connect a jumper wire between the (C18) A/C Pressure Signal circuit
and the (C918) Sensor Ground circuit in the Transducer harness con-
nector.
Ignition on, engine not running.
With the scan tool, monitor the A/C Pressure Transducer voltage.
Is the voltage below 1.0 volt with the jumper wire installed?
Yes
>> Replace the A/C Pressure Transducer.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
NOTE: Remove the jumper wire before continuing.
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ENGINE ELECTRICAL DIAGNOSTICS
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3.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C1 FCM 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 there voltage present?
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 C1 FCM 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
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5.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (F891) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (C18) A/C Pressure Signal circuit
and the (F891) 5-volt Supply circuit in the A/C Pressure Transducer
harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (F891) 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.
(C918) SENSOR GROUND CIRCUIT OPEN
Disconnect the C3 FCM harness connector.
Measure the resistance of the (C918) Sensor Ground circuit from the
A/C Pressure Sensor harness connector to the C3 FCM harness con-
nector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (C918) Sensor Ground circuit
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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