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Detroit Fault Codes SPN 51/FMI 4 – EPA07 – EPA10 – GHG14

24/11/2025
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SPN 51/FMI 4 - EPA07 - EPA10 - GHG14
Intake Throttle Valve Circuit Failed Low
SPN 51/FMI 4
Description This Fault Code Sets When There Is an open On The Intake Throttle Valve Circuit
Monitored Parameter Intake Air Throttle
Typical Enabling Conditions Key On
Monitor Sequence None
Execution Frequency Always Enabled
Typical Duration 2 Seconds
Dash Lamps MIL, CEL
Engine Reaction Derate 10%
Verification Engine Idle (1 minute)
SPN 51/FMI 4 - EPA07 - EPA10 - GHG14

Check as follows:

1. Connect DiagnosticLink® .

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

3. Check for multiple fault codes. Is fault code SPN 3509 FMI 4 also present?

3.1. Yes; diagnose fault code SPN 3509/FMI 4.

3.2. No; Go to step 4.

4. Turn the ignition off.

5. Disconnect and inspect the ITV electrical connector. Is there damage or corrosion present?

5.1. Yes; repair as necessary.

5.2. No; Go to step 6.

6. Measure the resistance across pins 2 and 3, component side, of the ITV motor connector. Is the resistance less than 10 ohms?

6.1. Yes; Go to step 7.

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

7. Measure the resistance across pins 1 and 2, component side, of the ITV motor connector. Is the resistance less than 10 ohms?

7.1. If resistance is greater than 5 ohms, repair open circuit between pin 90 of the MCM 120-pin connector and pin 1 of the ITV connector.

7.2. If resistance is less than 5 ohms, replace the ITV.

8. Turn the ignition ON.

9. Measure the voltage between pin 2 and pin 3 of the ITV electrical connector harness side. Is the voltage between 4.5 and 5.5 volts?

9.1. Yes; Go to step 10.

9.2. No; Go to step 13.

10. Turn the ignition OFF.

11. Disconnect and inspect the MCM 120-pin electrical connector. Is there damage or corrosion present?

11.1. Yes; repair as necessary.

11.2. No; Go to step 9.

12. Measure resistance between pin 1 of the ITV electrical connector harness side and pin 90 of the 120-pin MCM electrical connector harness side. Is the resistance less than 5 ohms?

12.1. Yes; replace the MCM. Refer to section “Removal of the Motor Control Module” .

12.2. No; repair the circuit between pin 1 of the ITV electrical connector harness side and pin 90 of the 120- pin MCM electrical connector harness side.

13. Measure the voltage between pin 3 and ground. Is the voltage between 4.5 and 5.5 volts?

13.1. Yes; repair the circuit between pin 2 of the ITV electrical connector harness side and the splice.

13.2. No; repair the circuit between pin 3 of the ITV electrical connector harness side and the splice.

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