Detroit Fault Codes SPN 94/FMI 1 – GHG14

1. Disconnect the Low Pressure Pump Output (LPPO) fuel pressure sensor.

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

3. Measure the voltage between pin 2 and 3 on the harness side of the LPPO fuel pressure sensor connector.

3.1. If the voltage is between 4.75 and 5 volts, Go to step 5.

3.2. If the voltage is NOT between 4.75 and 5 volts, Go to step 4.

4. Measure the voltage between pin 3 on the harness side of the LPPO fuel pressure sensor connector and battery ground.

4.1. If the voltage is between 4.75 and 5 volts, repair the wire between pin 2 of the LPPO fuel pressure sensor harness connector and pin 102 of the MCM 120-pin connector.

4.2. If the voltage is NOT between 4.75 and 5 volts, repair the wire between pin 3 of the LPPO fuel pressure sensor harness connector and pin 117 of the MCM 120-pin connector.

5. Turn the ignition OFF.

6. Disconnect the MCM 120-pin connector.

7. Measure the resistance between pin 1 of the LPPO fuel pressure sensor harness connector and pin 113 of the MCM 120- pin connector.

7.1. If the resistance is less than 3 ohms, replace the LPPO fuel pressure sensor.

7.2. If the resistance is greater than 3 ohms, repair the wire between pin 1 of the LPPO fuel pressure sensor harness connector and pin 113 of the MCM 120-pin connector.

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