DD15 SPN 91/FMI 3 Troubleshooting

SPN 91/FMI 3

The typical diagnosis for this fault is circuit failed high.‪

Check as follows:‪

1. Disconnect the Accelerator Pedal (AP).
2. Turn ON the ignition (key ON, engine OFF).
3. Measure the voltage between pins B and C of the AP harness connector.
   1. If the voltage is between 4.5 and 5.5 volts, go to step 5 .
   2. If the voltage is less than 4.5, go to the next step.
4. Measure the voltage between pins C of the AP harness connector and ground.
   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. Refer to “24.2.1.1 Verify Repairs” .
   2. If the voltage is less than 4.5, repair the open circuit between pin C of the AP harness connector and pin 8 of the CPC #1 connector. Refer to “24.2.1.1 Verify Repairs” .
5. Turn OFF the ignition.
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.
   1. If the resistance is greater than 3 Ω, repair the open circuit between pin A of the AP harness connector and pin 7 of the CPC #1 connector. Refer to “24.2.1.1 Verify Repairs” .
   2. If the resistance is less than 3 Ω, replace the Accelerator Pedal. Refer to “24.2.1.1 Verify Repairs” .