Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Attempt to start the engine. If the engine will not start, crank the engine for five seconds.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. With the scan tool, read DTCs.
  Does the scan tool display P0627-FUEL PUMP CONTROL CIRCUIT/OPEN?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (K31) FUEL PUMP CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Totally Integrated Power Module (TIPM) C1 harness connector.
3. Disconnect the Powertrain Control Module (PCM) C1 harness connector.
4. Check for continuity between the (K31) Fuel Pump Control circuit and all other circuits at the TIPM C1 harness connector.
  Is there continuity between the (K31) Fuel Pump Control circuit and any other circuit?
  
  Yes
  - Repair the (K31) Fuel Pump Control circuit for a short to the circuit that showed continuity.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K31) FUEL PUMP CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K31) Fuel Pump Control circuit at the TIPM C1 harness connector.
  Is there continuity between ground and the (K31) Fuel Pump Control circuit?
  
  Yes
  - Repair the (K31) Fuel Pump Control circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K31) FUEL PUMP CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
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.
1. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
2. Measure the resistance of the (K31) Fuel Pump Control circuit between the TIPM C1 harness connector and the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (K31) Fuel Pump Control circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Reconnect the PCM C1 harness connector.
2. Turn the ignition on.
3. With the scan tool, actuate the Fuel Pump Module to toggle on and off.
  NOTE:
  The (K31) Fuel Pump Control circuit could be supplying a 12.0 volt signal or ground signal depending on TIPM internal hardware configuration.
4. Using a voltmeter, monitor the (K31) Fuel Pump Control circuit for 12.0 volts or a ground to toggle with the actuator.
  Is the (K31) Fuel Pump Control circuit toggling with the actuator?
  
  Yes
  - Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  - Test complete.