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Detroit Fault Codes SPN 51/FMI 10 – GHG14

25/11/2025
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SPN 51/FMI 10 - GHG14
Intake Throttle Position Abnormal Rate of Change
SPN 51/FMI 10
Description Intake Throttle Position Abnormal Rate Of Change
Monitored Parameter Intake Throttle Valve
Typical Enabling Conditions Engine rpm = idle or higher
Monitor Sequence None
Execution Frequency Continuous when enabling conditions met
Typical Duration Five seconds
Dash Lamps None
Engine Reaction No Derate
Verification Engine rpm = idle or higher
SPN 51/FMI 10 - GHG14

Possible causes:

  • Faulty ITV motor
  • Faulty ITV position
  • Frozen (ice buildup) ITV butterfly

NOTE: With the new strategy when the ignition key is turned on, the ITV will cycle two full times and then the ITV will be commanded short increments.

Check as follows:

1. Connect Diagnostic Link™. Go to step 2.

2. Turn ignition ON (key ON, engine OFF). Go to step 3.

3. Check the Engine Coolant Temperature and Ambient Air Temperature in the Motor Control Module (MCM) when the fault code is set. Were temperatures below freezing when the code set?

3.1. Yes; Go to step 4.

3.2. No; Go to step 8.

4. Turn the ignition OFF. Go to step 5.

5. Remove the hose from the charge air cooler to the ITV. Go to step 6.

6. Inspect the hose and the ITV for signs of ice or moisture. Are there signs of ice or moisture?

6.1. Yes; clean the hose and ITV as necessary. Inspect the air intake system/air cleaner for signs of water intrusion. Repair as necessary. Verify repair.

6.2. No; Go to step 7.

7. Turn the ignition ON (key ON, engine OFF). Go to step 8.

8. Remove the hose from the charge air cooler to the ITV. Go to step 9.

9. Use the Service Routines greater than Intake Throttle Valve in DiagnosticLink to command the Intake Throttle Valve fully open and fully closed while watching the ITV flap. Does the ITV butterfly valve fully close and fully open when commanded?

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. Using the Intake Throttle Valve service routine, command the ITV to 20% while monitoring the ITV actual position. Is the actual valve position within +/- 5% of the commanded position?

10.1. Yes; Go to step 11.

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

11. Command the ITV to 50% while monitoring the ITV actual position. Is the actual valve position within +/- 5% of the commanded position?

11.1. Yes; Go to step 12.

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

12. Command the ITV to 90% while monitoring the ITV actual position. Is the actual valve position within +/- 5% of the commanded position?

12.1. Yes; Go to step 13.

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

13. Turn the ignition OFF. Go to step 14.

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

14.1. Yes; repair as necessary. Verify repair.

14.2. No; Go to step 15.

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

15.1. Yes; Go to step 16.

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

16. Install a test Motor Control Module (MCM). Go to step 17.

17. Road test the vehicle. Is code SPN 51/FMI 2 still present?

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

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

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