FAULT CODE 131 (IVS)

Accelerator Position Sensor Circuit

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Overview

CODE REASON EFFECT
Fault Code: 131
PID: P091
SPN: 91
FMI: 3
LAMP: Red
SRT: 00-084
High voltage detected at accelerator position signal pin 11 of the OEM harness connector. Severe derate (power and speed).

Accelerator Position Sensor Circuit

Circuit Description

The accelerator position sensor signals the electronic control module
(ECM) when the driver pushes on the accelerator pedal. The accelerator position circuit has three wires: positive (+) 5 VDC supply (wire 18), return ground
(wire 19), and signal (wire 11).

Component Location

The accelerator position sensor is located on the accelerator pedal.

Shop Talk

If all wiring and sensors check good, replace the accelerator position sensor circuit wires between the accelerator pedal and ECM with new wires. Run them through, or around, the bulkhead without using the bulkhead connector. Test with these wires. If fault clears, replace the OEM harness. Seal the bulkhead openings around the wires to prevent toxic, noxious fumes from seeping into the operator area.

The ECM and accelerator pedal must be calibrated to each other for proper engine response. This is required when a new accelerator pedal is installed, replaced, an ECM is replaced, a new calibration is downloaded to the ECM, or the accelerator pedal wiring is disconnected while keyswitch ON. With keyswitch ON, slowly push the accelerator to the floor and release; do this three times. This recalibrates the ECM and accelerator pedal. Note: The three wires in the accelerator position sensor circuit must be twisted together.

Cautions and Warnings


 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3823995 – male Weather-Pack test lead
Part Number 3823996 – female Weather-Pack test lead
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3822917- female Deutsch/AMP/Metri-Pack test lead
Part Number 3823255 – 3-pin Metri-Pack repair connector.

 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 3823995 – male Weather-Pack test lead
Part Number 3823996 – female Weather-Pack test lead
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use this test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the accelerator pedal.
STEP 1A. Inspect the harness and the accelerator position sensor connector pins. No damaged pins
STEP 1B. Check for continuity from ECM to accelerator position sensor. Less than 10 ohms
STEP 1C. Check the accelerator position resistance. 2000 to 3000 ohms
STEP 1D. Check the resistance between sensor pins. Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms. Released resistance must be at least 1000 ohms more than depressed resistance
STEP 2. Check the OEM harness.
STEP 2A. Inspect the harness, bulkhead connector, and ECM connector pins. No damaged pins
STEP 2B. Check the resistance between the positive (+) 5 VDC supply and return wires. 2000 to 3000 ohms
STEP 2C. Check the resistance in the positive (+) 5 VDC supply wire and signal wire circuit. Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms
STEP 2D. Check for a short circuit from the accelerator position signal and return wires to all other pins in the OEM harness. More than 100k ohms
STEP 3. Check for the ECM response.
STEP 3A. Check for the appropriate ECM response. Fault Code 131 inactive, Fault Code 132 active
STEP 3B. Check ECM signal pin resistance. Less than 100k ohms
STEP 4. Clear the fault codes.
STEP 4A. Disable the fault code. Fault Code 131 inactive
STEP 4B. Clear the inactive fault codes. All fault codes cleared


Guided Step 1 – Check the accelerator pedal.

Guided Step 1A – Inspect the harness and the accelerator position sensor connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the OEM harness from the accelerator position sensor.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals
  • Dirt or debris in or on the connector pins.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the OEM harness. Refer to Procedure 019-201 or 019-202.
  • Replace the OEM harness. Refer to the OEM troubleshooting and repair manual.
  • Replace the accelerator position sensor. Refer to the OEM troubleshooting and repair manual.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3823995 – male Weather-Pack test lead
Part Number 3823996 – female Weather-Pack test lead
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

Guided Step 1B – Check for continuity from ECM to accelerator position sensor.

Conditions

  • Turn keyswitch OFF.
  • Connect OEM harness to bulkhead connector.
  • Disconnect OEM harness from accelerator pedal.
  • Disconnect OEM harness connector from ECM.

Action

  • Measure the resistance from pin 11 of the OEM ECM connector to the signal pin of the accelerator position sensor connector.
  • Measure the resistance from pin 19 of the OEM ECM connector to the return pin of the accelerator position sensor connector.
  • Measure the resistance from pin 18 of the OEM ECM connector to the voltage supply pin of the accelerator position sensor connector.
OK NOT OK
Less than 10 ohms Repair or replace the accelerator position sensor wiring.

  • Repair the accelerator position sensor wiring. Refer to Procedure 019-203 or 019-202.
  • Replace the accelerator position sensor wiring. Refer to the OEM troubleshooting and repair manual.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3823995 – male Weather-Pack test lead
Part Number 3823996 – female Weather-Pack test lead
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3822917- female Deutsch/AMP/Metri-Pack test lead
Part Number 3823255 – 3-pin Metri-Pack repair connector.

Guided Step 1C – Check the accelerator position resistance.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the OEM harness from the accelerator position sensor.

Action

  • Measure the resistance between the positive (+) 5 VDC supply and the accelerator position sensor return on the sensor side of the accelerator position sensor when the accelerator pedal is released and when it is depressed.

Note: Install a 3-pin or other applicable part repair connector, Part Number 3823255, into the accelerator position sensor for idle validation switch.

OK NOT OK
2000 to 3000 ohms Replace the accelerator position sensor. Refer to the OEM troubleshooting and repair manual.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3823995 – male Weather-Pack test lead
Part Number 3823996 – female Weather-Pack test lead
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3822917- female Deutsch/AMP/Metri-Pack test lead
Part Number 3823255 – 3-pin Metri-Pack repair connector.

Guided Step 1D – Check the resistance between sensor pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the OEM harness from the accelerator position sensor.

Action

Note: Take the measurement when the pedal is depressed and released.

Note: Install a 3-pin or other applicable part repair connector, Part Number 3823255, into the accelerator position sensor for idle validation sensor.

  • Measure the resistance between the positive (+) 5 VDC supply wire and the signal wire on the sensor side of the accelerator position sensor.
OK NOT OK
Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms

Released resistance must be at least 1000 ohms more than depressed resistance.

Replace the accelerator position sensor. Refer to the OEM troubleshooting and repair manual.


Guided Step 2 – Check the OEM harness.

 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.

Guided Step 2A – Inspect the harness, bulkhead connector, and ECM connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the OEM harness connector from the ECM.
  • Disconnect the OEM harness from the accelerator pedal.
  • Disconnect the OEM harness from the bulkhead connector.
  • Clean and flush the connector with electronic contact cleaner, Part Number 3824510.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals
  • Dirt or debris in or on the connector pins.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the OEM harness. Refer to Procedure 019-203.
  • Replace the OEM harness. Refer to the OEM troubleshooting and repair manual.
  • Replace the ECM. Refer to Procedure 019-031.
  • Replace the o-ring on the 28-pin connector if it is damaged or missing. Refer to Procedure 019-203.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

Guided Step 2B – Check the resistance between the positive (+)
5 VDC supply and return wires.

Conditions

  • Turn keyswitch OFF.
  • Connect the OEM harness to the accelerator position sensor.
  • Connect the OEM harness to the bulkhead connector.
  • Disconnect the OEM harness connector from the ECM.

Action

  • Measure the resistance between pin 18 and pin 19 in the OEM harness when the accelerator pedal is up or down.
OK NOT OK
2000 to 3000 ohms Repair or replace the OEM harness. Refer to the OEM troubleshooting and repair manual.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

Guided Step 2C – Check the resistance in the positive (+) 5 VDC supply wire and the signal wire circuit.

Conditions

  • Turn keyswitch OFF.
  • Connect the OEM harness to the accelerator position sensor.
  • Connect the OEM harness to the bulkhead connector.
  • Disconnect the OEM harness connector from the ECM.

Action

  • Measure the resistance between pin 18 and pin 11 when the accelerator pedal is released and again when it is depressed.
OK NOT OK
Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms Repair or replace OEM harness. Refer to the OEM troubleshooting and repair manual.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

Guided Step 2D – Check for a short circuit from the accelerator position signal and return wires to all other pins in the OEM harness.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the OEM harness from the accelerator position sensor.
  • Disconnect the OEM harness connector from the ECM.

Action

  • Measure the resistance from pin 11 in the OEM harness connector to all other pins in the connector.
  • Measure the resistance from pin 18 in the OEM harness connector to all other pins in the connector.
  • Measure the resistance from pin 19 in the OEM harness connector to all other pins in the connector.
OK NOT OK
More than 100k ohms Repair or replace the OEM harness. Refer to the OEM troubleshooting and repair manual.


Guided Step 3 – Check for the ECM response.

Guided Step 3A – Check for the appropriate ECM response.

Conditions

  • Disconnect the OEM harness connector from the ECM.
  • Turn keyswitch ON.

Action

  • Install Part Number 3822917, as a jumper wire, between ECM OEM harness port pin 11 and pin 19.
  • Read the fault codes using INSITE™ electronic service tool.
OK NOT OK
Fault Code 131 inactive, Fault Code 132 active Replace the ECM. Refer to Procedure 019-031.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use this test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.

Guided Step 3B – Check ECM signal pin resistance.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the OEM harness connector from the ECM.

Action

  • Measure the resistance from pin 11 to pin 19 in the ECM OEM port; use test lead, Part Number 3822917.
OK NOT OK
Less than 100k ohms Replace the ECM. Refer to Procedure 019-031.


Guided Step 4 – Clear the fault codes.

Guided Step 4A – Disable the fault code.

Conditions

  • Connect all the components.

Action

  • Start the engine and let it idle for one minute.
  • Verify that the Fault Code 131 is inactive.
OK NOT OK
Fault Code 131 inactive Return to troubleshooting steps or contact your nearest Cummins Authorized Repair Location if all steps have been completed and checked again.

Guided Step 4B – Clear the inactive fault codes.

Conditions

  • Connect all the components.

Action

  • Erase the inactive fault codes using INSITE™ electronic service tool .
OK NOT OK
All fault codes cleared Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting chart
Last Modified:  08-Sep-2004