Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE ABILITY OF THE PCM TO READ THE ECT SENSOR 2 SIGNAL
1. Turn the ignition off.
2. Disconnect the ECT Sensor 2 harness connector.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  NOTE:
  The P2185-ENGINE COOLANT TEMPERATURE SENSOR 2 CIRCUIT HIGH DTC should be active or pending with the connector unplugged.
  
  Does the scan tool display as described above?
  
  Yes
  - Replace the Engine Coolant Temperature (ECT) Sensor 2 in accordance with the Service Information. Refer to SENSOR, COOLANT TEMPERATURE, REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK FOR THE (K25) ECT 2 SIGNAL CIRCUIT SHORTED TO THE (K917) SENSOR GROUND CIRCUIT
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Check for continuity between the (K25) ECT 2 Signal circuit and the (K917) Sensor Ground circuit at the ECT Sensor 2 harness connector.
  Is there continuity between the (K25) ECT 2 Signal circuit and the (K917) Sensor Ground circuit?
  
  Yes
  - Repair the short to between the (K25) ECT 2 Signal circuit and the (K917) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K25) ECT SIGNAL 2 CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K25) ECT 2 Signal circuit at the ECT Sensor 2 harness connector.
  Is there continuity between ground and the (K25) ECT 2 Signal circuit?
  
  Yes
  - Repair the (K25) ECT 2 Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .