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Diagnostic Procedure

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P0533-A/C PRESSURE SENSOR HIGH DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1
NOTE: Make sure the A/C refrigerant System is properly charged per the Service Information.
Start the engine.With the DRBIII®, read the A/C Pressure Sensor voltage.Is the voltage above 4.6 volts?Yes --> Go To 2No --> Refer to the INTERMITTENT CONDITION SYMPTOM .Perform POWERTRAIN VERIFICATION TEST VER - 2 .		 All
2 Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Connect a jumper wire between the (C18) A/C Pressure Signal circuit and the (K900) Sensor ground circuit in the Sensor harness connector.
Ignition on, engine not running.
With the DRBIII®, monitor the A/C Pressure Sensor voltage.
Is the voltage below 1.0 volt?
Yes --> Replace the A/C Pressure Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2 .
No --> Go To 3
NOTE: Remove the jumper wire before continuing.
 All
3 Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (C18) A/C Pressure Signal circuit at the A/C Pressure Sensor harness connector.
Does the test light illuminate brightly?
Yes --> Repair the short to voltage in the (C18) A/C Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 .
No --> Go To 4		 All
4 Turn the ignition off.
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 (C18) A/C Pressure Signal circuit from the A/C Pressure Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 5
No --> Repair the open in the (C18) A/C Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 .		 All
5 Measure the resistance between the (C18) A/C Pressure Signal circuit and the (K855) 5-volt Supply circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes --> Repair the short between the (F856) 5-volt Supply circuit and the (C18) A/C Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 .
No --> Go To 6		 All
6
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 (K900) Sensor ground circuit from the A/C Pressure Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?Yes --> Go To 7No --> Repair the open in the (K900) Sensor ground circuitPerform POWERTRAIN VERIFICATION TEST VER - 2 .		 All
7
NOTE: Before continuing, check the PCM 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.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 2 .		 All
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