DD15 SPN 91/FMI 2 Troubleshooting

SPN 91/FMI 2

A typical diagnosis for the fault is erratic data.‪

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 pin 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 “24.1.1.1 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 “24.1.1.1 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 “24.1.1.1 Verify Repairs” .
    2. If the resistance is less than 3 Ω, replace the Accelerator Pedal. Refer to “24.1.1.1 Verify Repairs” .

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