Diagnostic Test

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

CHECK FOR AN ACTIVE DTC
NOTE:
Diagnose and repair any system voltage or 5-Volt Reference DTCs before continuing with this test.
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 (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Throttle Body harness connector.
3. Disconnect the PCM-1 C2 harness connector.
4. Check for continuity between ground and the (K22) TPS 1 Signal circuit at the TPS harness connector.
  Is there continuity between ground and the (K22) TPS 1 Signal circuit?
  
  Yes
  - Repair the (K22) TPS 1 Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (K922) TPS SENSOR RETURN CIRCUIT
1. Check for continuity between the (K22) TPS 1 Signal circuit and the (K922) TPS Sensor Return circuit at the Throttle Body harness connector.
  Is there continuity between the (K22) TPS 1 Signal circuit and the (K922) TPS Sensor Return circuit?
  
  Yes
  - Repair the short between the (K22) TPS 1 Signal circuit and the (K922) TPS Sensor Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (K126) ETC MOTOR (-) CIRCUIT
1. Check for continuity between the (K22) TPS 1 Signal circuit and the (K126) ETC Motor (-) circuit at the Throttle Body harness connector.
  Is there continuity between the (K22) TPS 1 Signal circuit and the (K126) ETC Motor (-) circuit?
  
  Yes
  - Repair the short between the (K22) TPS 1 Signal circuit and the (K126) ETC Motor (-) circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (K124) ETC MOTOR (+) CIRCUIT
1. Check for continuity between the (K22) TPS 1 Signal circuit and the (K124) ETC Motor (+) circuit at the Throttle Body harness connector.
  Is there continuity between the (K22) TPS 1 Signal circuit and the (K124) ETC Motor (+) circuit?
  
  Yes
  - Repair the short between the (K22) TPS 1 Signal circuit and the (K124) ETC Motor (+) circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK THE ABILITY OF THE PCM-1 TO READ THE TPS 1 SIGNAL
1. Reconnect the PCM-1 C2 harness connector.
2. Connect a jumper between the (F851) 5-Volt Supply circuit and the (K22) TPS 1 Signal circuit at the Throttle Body harness connector.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  NOTE:
  The P0123-THROTTLE POSITION SENSOR 1 CIRCUIT HIGH DTC should be active or pending with the jumper in place.
  
  Does the scan tool display as described above?
  
  Yes
  - Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If no problems are found, replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL AND INSTALLATION . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select ETC RELEARN function.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM-1 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-1 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 (PCM) 1 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.