File: 12-fc131 Page 1 of 11. Fault Code 131 CODES REASON EFFECT

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Judith Harrell
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1 File: 12-fc131 Page 1 of 11 Fault Code 131 Accelerator Pedal or Lever Position Sensor Circuit - Voltage Above Normal, or Shorted to High Source CODES REASON EFFECT Fault Code: 131 PID(P), SID(S): P091 FMI: 3/3 Lamp: Red SRT: Accelerator Pedal or Lever Position Sensor Circuit - Voltage Above Normal, or Shorted to High Source. High voltage detected at accelerator pedal or lever position circuit. Severe derate in power output of the engine. Limp home power only. Accelerator Pedal or Lever Position Sensor Circuit Circuit Description: The accelerator pedal or lever position sensor is attached to the accelerator pedal or lever. The accelerator pedal or lever position sensor sends a signal to the electronic control module (ECM) when the accelerator pedal or lever is depressed and released. The accelerator pedal or lever position circuit contains three wires: accelerator pedal or lever Position +5 Volt Supply, accelerator pedal or lever Position Return, and accelerator pedal or lever Position Signal. Component Location: The accelerator pedal or lever position sensor is located on the accelerator pedal or lever. Refer to the OEM manual. Shop Talk: If troubleshooting an intermittent accelerator problem: The accelerator pedal or lever position sensor signal voltage can be monitored with the INSITE electronic service tool, while flexing the harness to locate the intermittent connection. Possible causes of this fault include: accelerator pedal or lever position signal circuit shorted to battery or +5 volt supply Open accelerator pedal or lever return circuit in the harness or connections Accelerator supply shorted to battery Failed accelerator pedal or lever position sensor.

2 File: 12-fc131 Page 2 of 11 Note: The three wires in the accelerator position sensor circuit must be twisted together.

3 File: 12-fc131 Page 3 of 11 TROUBLESHOOTING SUMMARY CAUTION To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: Part Number female Weather-Pack test lead Part Number male Deutsch/AMP/Metri-Pack test lead. STEPS SPECIFICATIONS SRT CODE STEP 1: Check the fault codes. STEP 1A: Check for sensor supply fault codes. Fault Code 387 active? STEP 1B: Check for an active fault code. Fault Code 131 active? STEP 2: STEP 2A: STEP 2B: Check the accelerator pedal or lever position sensor circuit. Inspect the accelerator pedal or lever position sensor and connector pins. Check the accelerator pedal or lever position sensor supply voltage and return circuit to 5.25 VDC? STEP 2C: Check the circuit response. Fault Code 132 active and Fault Code 131 inactive? STEP 2D: STEP 3: STEP 3A: STEP 3A-1: STEP 3A-2: Check the fault codes and verify accelerator pedal or lever condition. Check the ECM and OEM harness. Inspect ECM and OEM harness connector pins. Check for an open circuit in the OEM harness. Check for a pin-to-pin short circuit in the OEM harness. Fault Code 132 is active? Less than 10 ohms? Greater than 100k ohms? STEP 3B: Check for an inactive fault code. Fault Code 131 inactive? STEP 4: Clear the fault codes. STEP : Disable the fault code. Fault Code 131 inactive? STEP 4B: Clear the inactive fault codes. All fault codes cleared?

4 File: 12-fc131 Page 4 of 11 STEP 1: STEP 1A: Check the fault codes. Check for sensor supply fault codes. TROUBLESHOOTING STEP check for sensor supply fault codes. Using INSITE, read the fault codes. Fault Code 387 active? Fault Code 387 active? Fault Code 387 1B STEP 1B: Check for an active fault code. check for an active fault code. Using INSITE, read the fault codes. Fault Code 131 active? Fault Code 131 active? 2A Inactive or Intermittent Fault Code, Procedure

5 File: 12-fc131 Page 5 of 11 STEP 2: STEP 2A: Check the accelerator pedal or lever position sensor and circuit. Inspect the accelerator pedal or lever position sensor and connector pins. Disconnect the accelerator pedal or lever position sensor from the OEM harness. inspect the oem harness and sensor connector pins for the following: Loose connector Corroded pins Bent or broken pins Pushed back or expanded pins Moisture in or on the connector Missing or damaged connector seals Dirt or debris in or on the connector pins Wire insulation damage Connector shell broken. For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure A defective connection has been detected in the sensor or harness connector. Clean the connector and pins. Repair the damaged harness, connector, or pins if possible. Refer to Procedure B

6 File: 12-fc131 Page 6 of 11 STEP 2B: Check the accelerator pedal or lever position sensor supply voltage and return circuit. Disconnect the accelerator pedal or lever position sensor from the OEM harness. measure the voltage from the accelerator pedal position sensor +5 volt supply pin to the accelerator pedal position sensor return pin at the sensor connector of the oem harness. Refer to the wiring diagram for connector pin identification to 5.25 VDC? 4.75 to 5.25 VDC? 2C 3A STEP 2C: Check the circuit response. Disconnect the accelerator pedal or lever position sensor from the OEM harness. check for the appropriate ecm response after 30 seconds. Read the fault codes using INSITE. Fault Code 132 active and Fault Code 131 inactive? Fault Code 132 active and Fault Code 131 inactive? 2D 3A

7 File: 12-fc131 Page 7 of 11 STEP 2D: Check the fault codes and verify accelerator pedal or lever condition. Connect the accelerator pedal or lever to the OEM harness. check for the appropriate circuit response after 30 seconds. Using INSITE, read the fault codes. Fault Code 132 is active? A defective accelerator pedal or lever has been detected. Contact the appropriate OEM or dealership for repair instructions. Replace the accelerator pedal or lever. Refer to the OEM troubleshooting manual. Fault Code 132 is active? None. The removal and installation of the connector corrected the failure. STEP 3: STEP 3A: Check the ECM and OEM harness. Inspect the ECM and OEM harness connector pins. Disconnect the OEM harness from the ECM. inspect the oem harness and ecm connector pins for the following: Loose connector Corroded pins Bent or broken pins Pushed back or expanded pins Moisture in or on the connector Missing or damaged connector seals Dirt or debris in or on the connector pins Wire insulation damage Connector shell broken. For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure A defective connection has been detected in the harness connector. Clean the connector and pins. Repair the damaged harness, connector, or pins if possible. Refer to Procedure A-1

8 File: 12-fc131 Page 8 of 11 STEP 3A-1: Check for an open circuit in the OEM harness. Disconnect the OEM harness from the ECM. Disconnect the accelerator pedal or lever position sensor from the OEM harness. check for an open circuit. Measure the resistance between the OEM harness ECM connector accelerator pedal or lever RETURN pin and the OEM harness accelerator pedal or lever RETURN pin. Refer to the wiring diagram for connector pin identification. For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure Less than 10 ohms? Less than 10 ohms? An open RETURN circuit has been detected in the OEM harness. Repair or replace the OEM harness. Refer to Procedure A-2

9 File: 12-fc131 Page 9 of 11 STEP 3A-2: Check for a pin-to-pin short circuit in the OEM harness. Disconnect the OEM harness from the ECM. Disconnect the accelerator pedal or lever position sensor from the OEM harness. check for a pin to pin short. Measure the resistance between the accelerator pedal or lever SIGNAL pin in the OEM harness ECM connector and all other pins in the OEM connector. Refer to the wiring diagram for connector pin identification. For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure Greater than 100k ohms? Greater than 100k ohms? Repair or replace the OEM harness. Refer to Procedure B

10 File: 12-fc131 Page 10 of 11 STEP 3B: Check for an inactive fault code. Connect all components. check for the appropriate circuit response after 30 seconds. Using INSITE, read the fault codes. Fault Code 131 inactive? None. The removal and installation of the connector corrected the failure. Fault Code 131 inactive? Call for pre-authorization. Replace the ECM. Refer to Procedure STEP 4: STEP : Clear the fault codes. Disable the fault code. Connect all components. disable the fault code. Start the engine and let it idle for one minute. Using INSITE, verify that the fault code is inactive. Fault Code 131 inactive? Fault Code 131 inactive? 4B 1A STEP 4B: Clear the inactive fault codes. Connect all components. clear the inactive fault codes. Erase the inactive fault codes using INSITE. All fault codes cleared? All fault codes cleared? Repair complete Appropriate troubleshooti ng steps

11 File: 12-fc131 Page 11 of 11

TROUBLESHOOTING SUMMARY. STEPS SPECIFICATIONS SRT CODE STEP 1: Check the fault codes.

TROUBLESHOOTING SUMMARY. STEPS SPECIFICATIONS SRT CODE STEP 1: Check the fault codes. File: 16-t05-195-2wire Page 1 of 10 TROUBLESHOOTING SUMMARY CAUTION To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. CAUTION