Diagnostic Test

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

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 (F855) 5-VOLT SUPPLY CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
3. Connect the PCM C2 harness connector to the (special tool #10436, Adapter, GPEC Diagnostic) GPEC Adaptor.
4. Connect the GPEC Adaptor the PCM.
5. Turn the ignition on.
6. Measure the voltage on the (F855) 5-Volt Supply circuit at the GPEC Adaptor.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Go To 6
  No
  - Go To 3
CHECK FOR SHORTED COMPONENTS
NOTE:
If a component is shorted internally, the voltage measured on the 5 Volt Supply circuit will return to 5 volts when the shorted component is disconnected.

NOTE:
Cycle the ignition between voltage measurements.
1. Disconnect the harness connector for each of the following components, one at a time, while measuring the voltage on the (F855) 5-Volt Supply circuit at the GPEC Adaptor:
  - Throttle Body Assembly
  - Engine Oil Pressure (EOP) Sensor
  - Crankshaft Position (CKP) Sensor
  Did the voltage on the (F855) 5-Volt Supply circuit return to 5 volts after one of the components was disconnected?
  
  Yes
  - Replace the faulty component in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (F855) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
  NOTE:
  All of the components from the previous step should remain disconnected.
2. Disconnect the GPEC adaptor from the PCM.
3. Check for continuity between ground and the (F855) 5-Volt Supply circuit at the GPEC Adaptor.
  Is there continuity between ground and the (F855) 5-Volt Supply circuit?
  
  Yes
  - Repair the (F855) 5-Volt Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK FOR A SHORT TO ANOTHER CIRCUIT
1. Turn the ignition off.
2. Check for continuity between the (F855) 5-Volt Supply circuit and all other circuits at the GPEC Adaptor.
  Is there continuity between the (F855) 5-Volt Supply circuit and any other circuit?
  
  Yes
  - Repair the (F855) 5-Volt Supply circuit for a short to another circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
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 .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  - Test complete.