Circuit DescriptionThe accelerator pedal assembly with accelerator position sensor relays the acceleratorpercentage requested by the operator to the electronic control module (ECM). Percent acceleratoris used by the ECM to determine fueling. In order for the accelerator position sensor to functionproperly, it is necessary that a good +5-VDC supply voltage is available. Component LocationThe accelerator position sensor is located on the accelerator pedal inside the vehicle cab. Cummins ISB CM550 (1990-94) Fault Code: 387 PID: SID 232 SPN: FMI: 3 Accelerator Position Sensor Circuit Cummins ISB CM550 (1990-94) Fault Code: 387 PID: 91 SPN: FMI: 3 Accelerator Position Sensor Circuit Cummins...

Circuit DescriptionThe accelerator pedal assembly with accelerator position sensor relays the acceleratorpercentage requested by the operator to the electronic control module (ECM). Percent acceleratoris used by the ECM to determine fueling. In order for the accelerator position sensor to functionproperly, it is necessary that a good +5-VDC supply voltage is available. Component LocationThe accelerator position sensor is located on the accelerator pedal inside the vehicle cab. Cummins ISB CM550 (1990-94) Fault Code: 386 PID: SID 232 SPN: 620 FMI: 4 Sensor Suppy Circuit Cummins ISB CM550 (1990-94) Fault Code: 386 PID: SID 232 SPN: 620 FMI: 3 Sensor Suppy Circuit...

Circuit DescriptionThe accelerator pedal assembly with accelerator position sensor relays the acceleratorpercentage requested by the operator to the electronic control module (ECM). Percent acceleratoris used by the ECM to determine fueling. In order for the accelerator position sensor to functionproperly, it is necessary that a good +5-VDC supply voltage is available. Component LocationThe accelerator position sensor is located on the accelerator pedal inside the vehicle cab. Cummins ISB CM550 (1990-94) Fault Code: 387 PID: 91 SPN: FMI: 1 Accelerator Position Sensor Circuit Cummins ISB CM550 (1990-94) Fault Code: 387 PID: SID 232 SPN: FMI: 3 Accelerator Position Sensor Circuit Cummins...

Circuit DescriptionThe accelerator pedal assembly with accelerator position sensor relays the acceleratorpercentage requested by the operator to the electronic control module (ECM). Percent acceleratoris used by the ECM to determine fueling. In order for the accelerator position sensor to functionproperly, it is necessary that a good +5-VDC supply voltage is available. Component LocationThe accelerator position sensor is located on the accelerator pedal inside the vehicle cab. Cummins ISB CM550 (1990-94) Fault Code: 387 PID: 91 SPN: FMI: 3 Accelerator Position Sensor Circuit Cummins ISB CM550 (1990-94) Fault Code: 386 PID: SID 232 SPN: 620 FMI: 4 Sensor Suppy Circuit Cummins...

Circuit DescriptionThe fuel pump relay is used to supply voltage to the fuel pump. The engine control module(ECM) can shut down the engine by cutting off the power to the fuel shutoff relay circuit.Component LocationThis component is supplied by the equipment manufacturer. Refer to the original equipmentmanufacturer (OEM) service manual for component location. Shop Talk1) Inspect the fuel pump relay circuit for external wires that are spliced in to power anotherdevice. Remove any extra wires that are found in the circuit.2) If there is an external shutdown system on the vehicle that uses the fuel shutoff relaycircuit for engine shutdown,...