Diagnostic Test

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

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. Start the engine and allow it to idle for at least 60 seconds.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hand near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
2. With a scan tool, read DTCs.
  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 FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Mass Air Flow Sensor harness connector.
3. Disconnect the Throttle Body harness connector.
4. Disconnect the A/C Pressure Sensor harness connector.
5. Disconnect the Super Charger Bypass Valve harness connector.
6. Disconnect the Accelerator Pedal Position Sensor harness connector.
7. Disconnect the Crank Sensor harness connector.
8. Disconnect the Engine Oil Pressure Sensor harness connector.
9. Disconnect all of the Powertrain Control Module (PCM) harness connectors.
10. Turn the ignition on.
11. Measure the voltage on the (F855) 5-Volt Supply circuit in the MAP Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (F855) 5-Volt Supply circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (F855) 5-VOLT SUPPLY CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Connect the Powertrain Control Module (PCM) harness connectors.
3. Turn the ignition on.
4. Measure the voltage on the (F855) 5-Volt Supply circuit at the MAP Sensor harness connector.
  Is the voltage above 5.2 volts?
  
  Yes
  - Go To 5
  No
  - Go To 4
SENSOR SHORTED INTERNALLY
CAUTION:
Turn the ignition OFF when connecting or disconnecting a sensor or component connector, then turn the ignition ON when checking the circuit voltage.
1. Connect the connector for each sensor or component listed in step 2 that shares the (F855) 5-Volt Supply circuit and the (K852) 5-Volt Supply circuit, one at a time, and measure the voltage of the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.
  NOTE:
  To check the Throttle Body for an internal short, connect the Throttle Body harness connector and measure the voltage of the (F855) 5-Volt Supply circuit at the Crankshaft Position Sensor harness connector.
  
  Is the voltage above 5.2 volts when connecting any of the sensors?
  
  Yes
  - Replace the internally shorted sensor or component.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE PCM POWER AND GROUND CIRCUITS
1. Inspect all PCM power 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 6
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 .