Detroit Fault Codes SPN 91/FMI 10 – EPA10 – GHG14
Check as follows:
1. Disconnect the Accelerator Pedal (AP).
2. Turn the ignition ON (key ON, engine OFF).
3. Measure the voltage between pins B and C of the AP harness connector.
3.1. If the voltage is between 4.5 and 5.5 volts, Go to step 5.
3.2. If the voltage is less than 4.5 volts, Go to step 4.
4. Measure the voltage between pin C of the AP harness connector and ground.
4.1. If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin B of the AP harness connector and pin 4 of the CPC #1 connector.
4.2. If the voltage is less than 4.5 volts, repair the open circuit between pin C of the AP harness connector and pin 8 of the CPC #1 connector.
5. Turn OFF the ignition (key OFF, engine OFF).
6. Disconnect the CPC #1 connector.
7. Measure the resistance between pin A of the AP harness connector and pin 7 of the CPC #1 connector.
7.1. If the resistance is greater than 3 ohms, repair the open circuit between pin A of the AP harness connector and pin 7 of the CPC #1 connector.
7.2. If the resistance is less than 3 ohms, replace the AP.
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