Diagnostic Test

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

PCM CODES PRESENT
NOTE:
The PCM must have proper power and ground connections for the following tests to be valid. Refer to Checking the PCM Power and Grounds in the symptom list. Refer to DIAGNOSIS AND TESTING .
1. Turn the ignition on.
2. Using the scan tool, read the PCM DTCs.
  Does the scan tool display any PCM DTCs?
  
  Yes
  - Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 2
VEHICLE SECURITY CODES PRESENT
1. With the scan tool, read the WIN DTCs.
  Does the scan tool display any WIN DTCs?
  
  Yes
  - Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 3
CHECK FOR INTAKE SYSTEM LEAKS OR RESTRICTIONS
1. Turn the ignition off.
2. Make sure vehicle has adequate fuel supply in fuel tank.
3. Carefully inspect all air intake and Turbocharger related hoses/tubes and connections for leaks.
4. Inspect the air filter for excessive dirt, soiling or other problems that may cause restricted air flow.
  Were any problems found?
  
  Yes
  - Repair or replace as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 4
ECT SENSOR
1. Using a temperature probe, check the vehicle temperature near the ECT Sensor.
2. Turn the ignition on.
3. With the scan tool in Sensors, read the ECT Sensor temperature.
4. Compare the temperature probe reading with the scan tool reading.
  Are the two readings within 10°C of each other?
  
  Yes
  - Go To 5
  No
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
GLOW PLUGS
NOTE:
Prior to performing this test, be sure to check the Glow Plug Relay operation.
1. Check the Glow Plugs for proper operation.
  Are the Glow Plugs operating properly?
  
  Yes
  - Go To 6
  No
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
FUEL SYSTEM RESTRICTION
1. Inspect the fuel system lines for restrictions, leaks or other problems.
  Is there any evidence of problems?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 7
FUEL CONTAMINATION
1. Inspect the fuel supply for contamination.
  Is the fuel contaminated?
  
  Yes
  - Drain and replace the contaminated fuel in the system.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 8
CHECK FUEL PRESSURE AT ENGINE CRANKING
1. Using the scan tool, read the Fuel Pressure Sensor signal while cranking the engine.
  Does the Fuel Pressure Sensor signal increase to above 3500 psi (240 bar) within a few seconds after engine cranking begins?
  
  Yes
  - Go To 9
  No
  - Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to DIAGNOSIS AND TESTING .
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CRACKED OR BROKEN FLEX PLATE
1. Use the service information to gain access to and inspect for a broken or cracked flex plate.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 10
ENGINE DRIVE CHAINS
1. Refer to the service information and make sure the Engine Drive Chain is installed correctly and the camshaft and crankshaft gears are timed correctly.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the service information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .