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Accelerator Position Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 131 PID: P091 SPN: 91 FMI: 3 LAMP: Red SRT: |
High voltage detected at accelerator position signal pin. |
Engine idles when idle validation switch indicates idle and ramps up to a default speed when the idle validation switch indicates off-idle. |
 Accelerator Position Sensor Circuit
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Circuit Description
The accelerator position sensor is attached to the accelerator pedal. The accelerator position sensor sends a signal to the electronic control module (ECM) when the driver pushes on the accelerator pedal. The accelerator position circuit contains three wires: Signal wire (pin 83), a +5-VDC supply wire (pin 55), and a return ground (pin 81).
Note: The connector pin letters shown for the accelerator pedal wiring in these troubleshooting steps are examples of representative sensors. The connector pin assignments can vary with equipment manufacturer, but the base troubleshooting logic will still apply.
Component Location
The accelerator position sensor is located on the accelerator pedal.
Shop Talk
If all wiring and sensor checks look in good order, then replace the accelerator position sensor and the idle validation switch circuit wires between the accelerator pedal and the ECM with new wires. Run the wires through, or around the bulkhead without using the bulkhead connector. Test the truck with the test wires in place. If the fault goes away, replace the OEM harness. Seal the openings in the bulkhead around the connector and wires to prevent toxic and noxious fumes from entering the operator area.
Note: The three wires in the accelerator position sensor circuit must be twisted together. The same applies for the three wires in the idle validation switch (IVS) circuit.
Note: If pin 83 (signal) and pin 81 (return) are reversed, accelerator position will only read 50 percent.
Refer to Troubleshooting Fault Code t05-131
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