Circuit DescriptionThe ECM receives unswitched battery input through the engine harness. There are three inline7.5-amp fuses and two 10-amp fuses in the unswitched battery wire of the actuatorharness to protect the engine harness from overheating. Component LocationThe ECM is connected to the battery by the engine harness. This direct link provides aconstant power supply for the ECM. The location of the battery will vary with the equipmentmanufacturer. Refer to the equipment manufacturer’s repair manual for the battery location. Shop TalkMake sure the ECM unswitched battery supply is coming directly from the battery and not thestarter or other device. Check for...

Circuit DescriptionThe ECM receives unswitched battery input through the engine harness. There are two in-line10-amp fuses and three 7.5-amp fuses in the unswitched battery wire to protect the engineharness from overheating. The battery return wires are connected directly to the negative (-)battery post. Component LocationThe ECM is connected to the battery by the engine harness. This direct link provides aconstant power supply for the ECM. The location of the battery will vary with the originalequipment manufacturer (OEM). Refer to the OEM manual for battery location. Shop TalkDisconnect all aftermarket devices from the battery supply circuit. Make sure the proper sizefuses...

Circuit DescriptionThe accelerator pedal assembly with accelerator position sensor relays the acceleratorpercentage requested by the operator to the electronic control module (ECM). Percentaccelerator is used by the ECM to determine fueling. In order for the accelerator positionsensor to function properly, 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: 443 PID: SID 232 SPN: 620 FMI: 3 Accelerator Position Sensor Circuit Cummins ISB CM550 (1990-94) Fault Code: 443 PID: 91 SPN: 620 FMI: 3 Accelerator Position Sensor...

Circuit DescriptionThe accelerator pedal assembly with accelerator position sensor relays the acceleratorpercentage requested by the operator to the electronic control module (ECM). Percentaccelerator is used by the ECM to determine fueling. In order for the accelerator positionsensor to function properly, 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: 442 PID: 168 SPN: 168 FMI: 0 Unswitched Battery Supply Circuit Cummins ISB CM550 (1990-94) Fault Code: 441 PID: 168 SPN: 168 FMI: 1 Unswitched Battery Supply Circuit...

Circuit DescriptionThe accelerator pedal assembly with accelerator position sensor relays the acceleratorpercentage requested by the operator to the electronic control module (ECM). Percentaccelerator is used by the ECM to determine fueling. In order for the accelerator positionsensor to function properly, 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: 443 PID: 91 SPN: 620 FMI: 1 Accelerator Position Sensor Circuit Cummins ISB CM550 (1990-94) Fault Code: 443 PID: SID 232 SPN: 620 FMI: 3 Accelerator Position Sensor...