Diagnostic Test

CHECK THE (F854) 5-VOLT SUPPLY FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect all the Sensor harness connectors that share the (F854) 5-Volt Supply circuit.
3. Disconnect the APP Sensor harness connector.
4. Disconnect the Oil Pressure Sensor harness connector.
  NOTE:
  Improperly installed aftermarket accessories can cause this DTC to set. Check for wiring added by customer.
5. Turn the ignition on.
6. Measure the voltage between ground and the (F854) 5-Volt Supply circuit at the CKP Sensor harness connector.
  Is the voltage reading above 5.1 volts?
  
  Yes
  - Repair the short to voltage in the (F854) 5-Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
NOTE:
Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test.
1. Turn the ignition on for at least 60 seconds.
2. With a scan tool, read the active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (F854) PRIMARY 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO 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 (special tool #10436, Adapter, GPEC Diagnostic).
4. Reconnect the PCM C2 harness connector with the GPEC Adaptor connected in-line with the PCM C2 harness connector.
5. Disconnect the Throttle Body Assembly harness connector.
6. Disconnect the A/C Pressure Sensor harness connector.
7. Disconnect the CKP Sensor harness connector.
8. Disconnect the EOP Sensor harness connector.
9. Disconnect the APP Sensor harness connector.
10. Turn the ignition on.
11. Measure the voltage between ground and the (F854) Primary 5-Volt Supply circuit at the GPEC Adaptor.
  Is the voltage reading above 5.2 volts?
  
  Yes
  - Repair the (F854) Primary 5-Volt Supply circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K852) PRIMARY 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the PCM C1 harness connector.
3. Reconnect the PCM C1 harness connector with the GPEC Adaptor connected in-line with the PCM C1 harness connector.
4. Turn the ignition on.
5. Measure the voltage between ground and the (K852) Primary 5-Volt Supply circuits at the GPEC Adaptor.
  Is the voltage reading above 5.2 volts?
  
  Yes
  - Repair the (K852) Primary 5-Volt Supply circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
SENSOR SHORTED INTERNALLY
1. IMPORTANT - FOLLOW THIS PROCEDURE EXACTLY WHEN CHECKING THE FOLLOWING COMPONENTS: Turn the ignition off before connecting each component. After a component has been connected, turn the ignition on and measure the voltage on the (F854) Primary 5-Volt Supply circuit at the GPEC Adaptor. If the 5-Volt Supply voltage goes above 5.1 volts after connecting a component, the component that was connected is faulty. If the voltage remains at 5.0 volts after connecting a component, then the connected component is not the problem. Leave each component connected and move on to the next until the faulty component is discovered or all components have been connected. Connect only one component at a time during this step.
2. Connect the connector for each sensor or component, one at a time, and measure the voltage of the (F854) Primary 5-Volt Supply circuit at the GPEC Adaptor.
  Does the voltage go above 5.1 volts when connecting any of the sensors?
  
  Yes
  - Replace the faulty sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECKING THE PCM POWER AND GROUND CIRCUITS
1. Perform the NO RESPONSE FROM THE PCM test procedure. Refer to the appropriate Diagnostic information .
  NOTE:
  Check the PCM B+, Fused Ignition, ASD inputs and ground circuits.
  
  Were any problems found?
  
  Yes
  - Repair the PCM power and ground circuit(s) as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between all applicable components and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .