Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Turn the ignition off.
2. If possible, allow the vehicle to sit with the ignition off for more than 480 minutes in an environment where the temperature is consistent and above -7° C (19.4° F).
3. Test drive the vehicle. The vehicle must exceed 48 km/h (30 mph) during the test drive. Do not cycle the ignition off when the test drive is completed.
4. With the scan tool, select View the DTCs.
  NOTE:
  Diagnose any CAN Communication DTCs before continuing.
  
  NOTE:
  If any ECT, AAT, CMP or CKP sensor DTCs have set along with P1115, diagnose them before continuing.
  
  NOTE:
  In cold weather, this DTC could be set by a high powered block heater and no repair would be required.
  
  Is the DTC Active or Pending at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
TEMPERATURE SENSOR READINGS
1. Turn the ignition off.
2. Allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and above -7° C (19.4° F) until the engine coolant temperature is equal to ambient temperature.
3. Turn the ignition on.
4. With the scan tool, compare the AAT, ECT and IAT sensor values.
  Are all of the temperature sensor values within a range of 10° C (18° F)?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
  No
  - Go To 3.
TEMPERATURE SENSOR
1. Ignition on, engine not running.
2. Disconnect the suspected faulty sensor.
3. Connect a jumper wire between the Sensor Signal circuit and the Sensor ground circuit.
4. With the scan tool, read the voltage of the suspected Sensor.
  Did the voltage reading start at 4.8 to 5.0 Volts and decrease to 0 Volts when the jumper wire was installed?
  
  Yes
  - Verify that there is good pin to terminal contact in the Sensor and Control Module connectors. If OK, replace the appropriate Temperature Sensor. Refer to SENSOR, COOLANT TEMPERATURE, REMOVAL , or SENSOR, AIR TEMPERATURE, INTAKE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4.
    NOTE:
    Remove the jumper wire before continuing.
EXCESSIVE RESISTANCE IN THE TEMPERATURE SENSOR SIGNAL CIRCUIT

Fig 1: Measuring Resistance Of ECT Sensor Signal Circuit From Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the C1 and C2 PCM harness connectors.
  
  Fig 2: Measuring Air Intake Temperature Sensor Signal Circuit Resistance
  Courtesy of CHRYSLER GROUP, LLC
3. Disconnect the C4 TIPM 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 the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
  
  Fig 3: Checking AAT Signal Circuit For An Open Or Excessive Resistance
  Courtesy of CHRYSLER GROUP, LLC
4. Measure the resistance of the Sensor Signal circuit from the Sensor harness connector to the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) or the C4 TIPM harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the excessive resistance in the Temperature Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5.
EXCESSIVE RESISTANCE IN THE SENSOR GROUND CIRCUIT

Fig 4: Measuring Resistance Of ECT Sensor Ground Circuit From Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER GROUP, LLC

Fig 5: Measuring Resistance Of Sensor Ground Circuit From IAT Sensor Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the Sensor ground circuit from the Sensor harness connector to the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) or the C4 TIPM harness connector.
  
  Fig 6: Checking AAT Sensor Ground Circuit For An Open Or Excessive Resistance
  Courtesy of CHRYSLER GROUP, LLC
  
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the excessive resistance in the Sensor ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6.
SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Fig 7: Measuring Resistance Between Ground And ECT Sensor Signal Circuit In Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the Sensor Signal circuit at the Sensor harness connector.
  
  Fig 8: Measuring Resistance Between Ground And IAT Sensor Signal Circuit At IAT Sensor Harness Connector
  Courtesy of CHRYSLER GROUP, LLC
  
  Fig 9: Measuring Resistance Between Ground And AAT Sensor Signal Circuit In AAT Sensor Harness Connector
  Courtesy of CHRYSLER GROUP, LLC
  
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7.
SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT

Fig 10: Measuring Resistance Between ECT Sensor Signal Circuit And Ground Circuit In Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC

Fig 11: Measuring Resistance Between IAT Sensor Signal Circuit And Sensor Ground Circuit At IAT Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the Sensor Signal circuit at the Sensor harness connector.
  
  Fig 12: Measuring Resistance Between Sensor Return Circuit And Sensor Signal Circuit In AAT Sensor Harness Connector
  Courtesy of CHRYSLER GROUP, LLC
  
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short between the Sensor ground circuit and the Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8.
SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 13: Measuring Voltage On ECT Sensor Signal Circuit Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition on.
2. Measure the voltage on the Sensor Signal circuit at the Sensor harness connector.
  
  Fig 14: Measuring Voltage On AAT Signal Circuit In AAT Sensor Harness Connector
  Courtesy of CHRYSLER GROUP, LLC
  
  Fig 15: Measuring Voltage Of IAT Sensor Signal Circuit At IAT Sensor Harness Connector
  Courtesy of CHRYSLER GROUP, LLC
  
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 9.
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .