Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

ACTIVE DTC
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 may result in possible serious or fatal injury.
  
  NOTE:
  Diagnose and repair any system voltage DTCs before continuing with this test.
2. With the scan tool, select View DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2.
  No
  - Refer to STANDARD PROCEDURE and perform the INTERMITTENT CONDITION diagnostic procedure.
ECT SENSOR
1. Turn the ignition off.
2. Disconnect the ECT harness connector.
3. Ignition on, engine not running.
4. With the scan tool, read ECT voltage.
  NOTE:
  The sensor voltage should be approximately 5.0 Volts (plus or minus 0.1 Volt) with the connector disconnected.
  
  Does the scan tool display the voltage as described above?
  
  Yes
  - Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. If OK, replace the ECT Sensor. Refer to SENSOR, COOLANT TEMPERATURE, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  No
  - Go To 3.
(K2) ECT SIGNAL CIRCUIT SHORTED TO THE (K915) SENSOR GROUND CIRCUIT

Fig 1: Checking ECT Signal Circuit For Short To Sensor Ground Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance between the (K915) Sensor ground circuit and the (K2) ECT Signal circuit in the ECT Sensor harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the short to between the (K915) Sensor ground circuit and the (K2) ECT Signal circuit.
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  No
  - Go To 4.
(K2) ECT SIGNAL CIRCUIT SHORTED GROUND

Fig 2: Checking ECT Signal Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (K2) ECT Signal circuit in the ECT Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (K2) ECT Signal circuit.
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  No
  - Go To 5.
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the ECT 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 ECT Sensor and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the POWERTRAIN VERIFICATION TEST.