Diagnostic Test

ACTIVE DTC
NOTE:
Diagnose and repair any CAN bus, communication or implausible signal DTCs before proceeding with this test.

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. Refer to SPECIFICATIONS .
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
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
(C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the A/C Pressure Transducer harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.
  Is the voltage above 4.5 Volts?
  
  Yes
  - Go To 6
  No
  - Go To 3
(C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO GROUND
1. Turn the ignition on.
2. Disconnect the Totally Integrated Power Module (TIPM) harness connector.
3. Measure the resistance between ground and the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.
  Is the resistance above 1000 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (C818) A/C Pressure Sensor Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO (C918) A/C PRESSURE SENSOR GROUND CIRCUIT

Fig 1: Checking A/C Pressure Sensor Signal Circuit For Short To A/C Pressure Sensor Ground Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (C818) A/C Pressure Sensor Supply circuit and the (C918) A/C Pressure Sensor Ground circuit in the A/C Pressure Transducer harness connector.
  Is the resistance above 100 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (C818) A/C Pressure Sensor Supply circuit for a short to the (C918) A/C Pressure Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (C818) A/C Pressure Sensor Supply circuit between the A/C Pressure Transducer harness connector and the Totally Integrated Power Module (TIPM) harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 10
  No
  - Repair the (C818) A/C Pressure Sensor Supply circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Disconnect the Totally Integrated Power Module (TIPM) harness connector.
3. Measure the resistance between ground and the (C18) A/C Pressure Sensor Signal circuit in the A/C Pressure Transducer harness connector.
  Is the resistance above 100 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (C18) A/C Pressure Sensor Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (C918) A/C PRESSURE SENSOR GROUND CIRCUIT

Fig 2: Checking A/C Pressure Transducer Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (C18) A/C Pressure Sensor Signal circuit and the (C918) A/C Pressure Sensor Ground circuit in the A/C Pressure Transducer harness connector.
  Is the resistance above 100 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (C18) A/C Pressure Sensor Signal circuit for a short to the (C918) A/C Pressure Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
1. 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) harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 9
  No
  - Repair the (C18) A/C Pressure Sensor Signal circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
A/C PRESSURE TRANSDUCER
1. Turn the ignition off.
2. Connect the Totally Integrated Power Module (TIPM) harness connector.
3. Connect a jumper wire between the (C818) A/C Pressure Sensor Supply 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 AC Pressure Transducer signal voltage.
  Is the voltage above 4.5 Volts with the jumper wire in place?
  
  Yes
  - Replace the A/C Pressure Transducer in accordance with the Service Information. Refer to TRANSDUCER, A/C PRESSURE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 10
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 .
  No
  - Replace and program the Totally Integrated Power Module (TIPM) in accordance with the Service Information. Refer to MODULE, TOTALLY INTEGRATED POWER (TIPM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .