Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
If there are any 5-Volt Supply DTCs present, perform the diagnostics for those DTCs before continuing with this test procedure.
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 (N7) FTP SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the FTP Sensor harness connector.
3. Disconnect the PCM C2 harness connector.
4. Check for continuity between ground and the (N7) FTP Sensor Signal circuit at the FTP Sensor harness connector.
  Is there continuity between ground and the (N7) FTP Sensor Signal circuit?
  
  Yes
  - Repair the (N7) FTP Sensor Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK FOR THE (N7) FTP SENSOR SIGNAL CIRCUIT SHORTED TO THE (K917) SENSOR GROUND CIRCUIT
1. Check for continuity between the (N7) FTP Sensor Signal circuit and the (K917) Sensor Ground circuit at the FTP Sensor harness connector.
  Is there continuity between the (N7) FTP Sensor Signal circuit and the (K917) Sensor Ground circuit?
  
  Yes
  - Repair the short between the (N7) FTP Sensor Signal circuit and the (K917) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
FUEL TANK PRESSURE SENSOR
1. Reconnect the PCM C2 harness connector.
2. Connect a jumper between the (N7) FTP Sensor Signal circuit and the (K859) 5-Volt Supply circuit at the FTP Sensor harness connector.
3. Turn the ignition on.
  NOTE:
  The scan tool should display the P1457-FUEL TANK PRESSURE SENSOR CIRCUIT HIGH DTC as active or pending with the jumper in place.
4. With the scan tool, read DTCs.
  Does the DTC display as described above?
  
  Yes
  - Replace the FTP Sensor in accordance with the Service Information.
  - 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 the Powertrain Control Module 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
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  - Test complete.