Dodge Ram Truck 1500-2500-3500. Manual — part 912
P0532-A/C PRESSURE SENSOR CIRCUIT LOW
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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Engine running, AC is learned, and AC Clutch Relay energized.
•
Set Condition:
The A/C pressure transducer signal voltage at the PCM goes below 0.58 of a volt for 2.6 seconds. One Trip
Fault. Three good trips to turn off the MIL.
Possible Causes
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
A/C PRESSURE TRANSDUCER
(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
A/C PRESSURE TRANSDUCER VOLTAGE BELOW 0.6 OF A VOLT
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 below 0.6 of a volt?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
(F855) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the A/C Pressure Transducer harness connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit in the A/C
Pressure Transducer harness connector.
Is the voltage between 4.5 to 5.2 volts?
Yes
>> Go To 3
No
>> Go To 6
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
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P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED)
3.
A/C PRESSURE TRANSDUCER
With the scan tool, monitor the A/C Pressure Transducer voltage.
Is the voltage above 0.6 of a volt?
Yes
>> Replace the A/C Pressure Transducer.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1 PCM harness connector.
Measure the resistance between ground and the (C918) A/C Pressure
Signal circuit in the A/C Pressure Transducer harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (C918) A/C Pressure Sig-
nal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
Disconnect the C2 PCM harness connector.
Measure the resistance between the (C918) A/C Pressure Signal cir-
cuit and the (K900) Sensor Ground circuit in the A/C Pressure Trans-
ducer harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K900) Sensor Ground cir-
cuit and the (C918) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED)
6.
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the C2 PCM harness connector.
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 (F855) 5-volt Supply circuit from the A/C
Pressure Transducer harness connector to the appropriate terminal of
special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (F855) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
7.
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (F855) 5-volt Supply
circuit in the A/C Pressure Transducer harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (F855) 5-volt Supply cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
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