Detroit Fault Codes SPN 84/FMI 3 – EPA07 – GHG14

1. Disconnect the Vehicle Speed Sensor (VSS).
2. Measure the resistance between pin 13 of the Common Powertrain Controller (CPC) connector #3 (21–pin) and pin 1 of the VSS.
2.1. If the resistance is greater than 3 ohms, repair the open between pin 13 of the CPC connector #3 (21–pin) and pin 1 of the VSS.
2.2. If the resistance is less than 3 ohms, Go to step 3.

3. Measure the resistance between pin 14 of the CPC connector #3 (21–pin) and pin 2 of the VSS sensor.
3.1. If the resistance is greater than 3 ohms, repair the open wire between pin 14 of the CPC #3 connector (21–pin) and pin 2 of the VSS.
3.2. If the resistance is less than 3 ohms, Go to step 4.

4. Measure the resistance between pin 13 and 14 of the CPC connector #3 (21–pin).
4.1. If the resistance greater than 3 ohms, replace the VSS.
4.2. If the resistance is less than 3 ohms, repair the short in the harness between pins 13 and 14 of the CPC connector #3 (21–pin).

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