Diagnostic Routine A
Diagnostic Routine A
Diagnostic Overview
P0532:00, P0533:00
Refer to Wiring Diagram Set 54 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
The A/C (Air Conditioning) pressure transducer receives a ground from the PCM (Powertrain Control Module). A 5-volt reference voltage is supplied to the A/C (Air Conditioning) pressure transducer from the PCM (Powertrain Control Module). The A/C (Air Conditioning) pressure transducer then sends a voltage to the PCM (Powertrain Control Module) to indicate the A/C (Air Conditioning) refrigerant pressure.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect loose or corroded PCM (Powertrain Control Module) and A/C (Air Conditioning) pressure transducer connections.
Pinpoint Test
1. CHECK THE PCM (Powertrain Control Module) OUTPUT VOLTAGE
1. Ignition OFF.
2. Disconnect: A/C (Air Conditioning) Pressure Transducer.
3. Ignition ON.
4. Measure:
Is the voltage between 4.7 and 5.1 volts?
2. CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO GROUND
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B (3.5L) or C1381B (2.0L).
3. Disconnect: Generator Current Sensor.
4. Measure:
Is the resistance greater than 10,000 ohms?
3. CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN
1. 3.5L engine, measure:
2. 2.0L engine, measure:
Is the resistance less than 3 ohms?
4. CHECK THE PCM (Powertrain Control Module) SENSOR GROUND
1. Measure:
Is the voltage greater than 4.7 volts?
5. CHECK THE A/C (Air Conditioning) PRESSURE SENSOR (ACP_V) PCM (Powertrain Control Module) PID (Parameter Identification) WITH THE A/C (Air Conditioning) PRESSURE TRANSDUCER SHORTED
1. Ignition OFF.
2. Connect a fused jumper wire:
3. Ignition ON.
4. Using a scan tool, view PCM (Powertrain Control Module) PIDs (Parameter Identifications).
5. Monitor the PCM (Powertrain Control Module) PID (Parameter Identification) ACP_V.
Does the PID (Parameter Identification) voltage read between 4.7 and 5.1 volts?
6. CHECK THE A/C (Air Conditioning) PRESSURE TRANSDUCER FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B (3.5L) or C1381B (2.0L).
3. Measure:
Is the resistance greater than 10,000 ohms?
7. CHECK THE A/C (Air Conditioning) PRESSURE TRANSDUCER FEEDBACK CIRCUIT FOR AN OPEN
1. 3.5L engine, measure:
2. 2.0L engine, measure:
Is the resistance less than 3 ohms?
8. CHECK THE A/C (Air Conditioning) PRESSURE TRANSDUCER FEEDBACK CIRCUIT FOR SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
9. CHECK THE A/C (Air Conditioning) PRESSURE TRANSDUCER
1. Using a scan tool, view PCM (Powertrain Control Module) PIDs (Parameter Identifications).
2. Monitor the PCM (Powertrain Control Module) PID (Parameter Identification) ACP_V.
Does the PID (Parameter Identification) voltage read 0 volts?
10. CHECK THE A/C (Air Conditioning) PRESSURE TRANSDUCER FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B (3.5L) or C1381B (2.0L).
3. Ignition ON.
4. Measure:
Is any voltage present?
11. CHECK THE A/C (Air Conditioning) PRESSURE TRANSDUCER FEEDBACK CIRCUIT FOR A SHORT TO THE REFERENCE VOLTAGE CIRCUIT
1. Ignition OFF.
2. Measure:
Is the resistance greater than 10,000 ohms?
12. CHECK FOR CORRECT PCM (Powertrain Control Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect all PCM (Powertrain Control Module) connectors.
3. Repair:
- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary
4. Reconnect the PCM (Powertrain Control Module) connectors. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
