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Detroit Fault Codes SPN 51/FMI 2 – EPA07 – EPA10 – GHG14

20/11/2025
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SPN 51/FMI 2 - EPA07 - EPA10 - GHG14
Intake Throttle Position Deviation Error
SPN 51/FMI 2
Description This Code Sets When The Intake Throttle Valve Position Has A 15% Deviation From The Position Commanded By The Motor Control Module (MCM) When The Engine Coolant Temperature Is Above 60°C (140°F)
Monitored Parameter Intake Throttle Valve (ITV)
Typical Enabling Conditions Coolant Temperature Is Greater Than 60°C (140°F)
Monitor Sequence None
Execution Frequency Continuous When Enabling Conditions Met
Typical Duration Five Seconds
Dash Lamps MIL, CEL
Engine Reaction 10% Derate
Verification Engine rpm = 600 rpm or Higher
SPN 51/FMI 2 - EPA07 - EPA10 - GHG14

Possible causes:

  • Faulty ITV motor
  • Faulty ITV position sensor
  • Sticking ITV

Check as follows:

1. Turn the ignition OFF.

2. Remove the hose from the Charge Air Cooler (CAC) to the ITV.

3. Visually inspect the ITV butterfly valve. Is there damage to the butterfly valve?1.

3.1 Yes; replace the ITV. Refer to section “Removal of the Intake Throttle Valve and Adaptor” . Verify repair.

3.2 No; Go to step 4.

4. Connect Diagnostic Link® .

5. Turn the ignition ON, (key ON, engine OFF).

6. Using DiagnosticLink, command the ITV by clicking the “full open” and “full closed” buttons while watching the ITV flap. Does the ITV butterfly valve fully close and fully open when commanded?

6.1 Yes; Go to step 7.

6.2 No; replace the ITV. Refer to section “Removal of the Intake Throttle Valve and Adaptor” .

7. Using the Air Intake Throttle service routine, command the ITV to 20% while monitoring the ITV actual position. Is the actual valve position between 14% and 26%?

7.1 Yes; Go to step 8.

7.2 No; replace the ITV. Refer to section “Removal of the Intake Throttle Valve and Adaptor” . Verify repair.

8. Command the ITV to 50% while monitoring the ITV actual position. Is the actual valve position between 44% and 56%?

8.1 Yes; Go to step 9.

8.2 No; replace the ITV. Refer to section “Removal of the Intake Throttle Valve and Adaptor” . Verify repair.

9 Command the ITV to 90% while monitoring the ITV actual position. Is the actual valve position between 84% and 96%?

9.1. Yes; Go to step 10.

9.2. No; replace the ITV. Refer to section “Removal of the Intake Throttle Valve and Adaptor” . Verify repair.

10. Turn the ignition OFF.

11. Disconnect and inspect the ITV 5-pin connector. Are there any damaged pins, spread pins, corrosion present or is the retainer clip missing?

11.1 Yes; repair as necessary.

11.2 No; Go to step 12.

12. Measure the resistance across pins 4 and 5, component side, of the ITV motor connector. Is the resistance less than 10 ohms?

12.1 Yes; Go to step 13.

12.2 No; replace the ITV due to a shorted motor. Refer to section “Removal of the Intake Throttle Valve and Adaptor” . Verify repair.

13. Disconnect the 120-pin MCM connector.

14. Measure the resistance between pin 4 of the 5-pin Intake Throttle Valve electrical connector harness side and pin 100 of the 120-pin MCM electrical connector harness side. Is the resistance less than 5 ohms?

14.1 Yes; Go to step 15.

14.2 No; repair the circuit between pin 4 of the 5-pin Intake Throttle Valve electrical connector harness side and pin 101 of the 120-pin MCM electrical connector harness side.

15. Measure the resistance between pin 5 of the 5-pin intake throttle valve electrical connector harness side and pin 101 of the 120-pin MCM electrical connector harness side. Is the resistance less than 5 ohms?

15.1 Yes; Go to step 16.

15.2 No; repair the circuit between pin 5 of the 5-pin intake throttle valve electrical connector harness side and pin 101 of the 120-pin MCM electrical connector harness side.

16. Install a test MCM

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.

ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.

17. Start and run the engine until the engine coolant temperature is above 60°C (140°F).

18. Erase fault code SPN 51/FMI 2.

19. Road test the vehicle. Does code SPN 51/FMI 2 return?1.

19.1 Yes; replace the ITV. Refer to section “Removal of the Intake Throttle Valve and Adaptor” .

19.2 No; replace the MCM. Refer to section “Removal of the Motor Control Module”

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