Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Diagnose and repair any system voltage DTCs before continuing with this test.
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
ECT SENSOR
1. Turn the ignition off.
2. Disconnect the ECT Sensor harness connector.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  NOTE:
  The P0118-ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT HIGH DTC should be active or pending with the connector unplugged.
  
  Does the scan tool display 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 Engine Coolant Temperature Sensor. Refer to SENSOR, COOLANT TEMPERATURE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK FOR THE (K2) ECT SIGNAL CIRCUIT SHORTED TO THE (K915) SENSOR GROUND CIRCUIT
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Check for continuity between the (K915) Sensor ground circuit and the (K2) ECT Signal circuit in the ECT Sensor harness connector.
  Is there continuity between the (K915) Sensor ground circuit and the (K2) ECT Signal circuit?
  
  Yes
  - Repair the short to between the (K915) Sensor ground circuit and the (K2) ECT Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K2) ECT SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K2) ECT Signal circuit at the ECT Sensor harness connector.
  Is there continuity between ground and the (K2) ECT Signal circuit?
  
  Yes
  - Repair the (K2) ECT Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 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 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 (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .