Diagnostic Test

ACTIVE DTC
NOTE:
Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

NOTE:
Make sure the A/C refrigerant System is properly charged in accordance with the Service Information.
1. Start the engine and allow it to reach normal operating temperature.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
2. With the scan tool, select View DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2
  No
  - Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
(C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking 5 Volt Supply Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the A/C Pressure Transducer connector.
3. Disconnect the Totally Integrated Power Module (TIPM) C5 harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (C818) A/C Pressure Sensor Supply circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go To 3
(C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 2: Checking A/C Pressure Sensor Signal Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage of the (C18) A/C Pressure Sensor Signal circuit in the A/C Pressure Transducer harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (C18) A/C Pressure Sensor Signal circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go To 4
(C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT

Fig 3: Checking A/C Pressure Sensor Signal Circuit For Short To A/C Pressure Sensor Supply Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (C18) A/C Pressure Sensor Signal circuit and the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the (C18) A/C Pressure Sensor Signal circuit for a short to the (C818) A/C Pressure Sensor Supply circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go To 5
(C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Checking A/C Pressure Sensor Signal Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Measure the resistance of the (C18) A/C Pressure Sensor Signal circuit between the A/C Pressure Transducer harness connector and the Totally Integrated Power Module (TIPM) C5 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (C18) A/C Pressure Sensor Signal circuit for an open circuit or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
(C918) A/C PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 5: Checking A/C Pressure Sensor Ground Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (C918) A/C Pressure Sensor Ground circuit between the A/C Pressure Transducer harness connector and the Totally Integrated Power Module (TIPM) C5 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (C918) A/C Pressure Sensor Ground circuit for an open circuit or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
A/C PRESSURE TRANSDUCER

Fig 6: Checking A/C Pressure Transducer
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Connect the Totally Integrated Power Module (TIPM) C5 harness connector.
3. Connect a jumper wire between the (C918) A/C Pressure Sensor Ground circuit and the (C18) A/C Pressure Sensor Signal circuit in the A/C Pressure Transducer harness connector.
4. Turn the ignition on.
5. With the scan tool, read the A/C Pressure Transducer signal voltage.
  Is the voltage below 1.0 Volt with the jumper wire in place?
  
  Yes
  - Replace the A/C Pressure Transducer in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go To 8
TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the A/C Pressure Transducer and the Totally Integrated Power Module (TIPM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Replace and program the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .