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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: 00-084 |
High voltage detected at accelerator position signal pin 11 of the OEM harness connector. | Severe derate (power and speed). |
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Accelerator Position Sensor Circuit |
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Circuit Description
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: 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 wires 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 is 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: |
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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: |
|
CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
|
CAUTION
To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
|
CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
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
Action
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| OK | NOT OK |
| No damaged pins | Repair the damaged pins.
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CAUTION
To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 1B – Check for continuity from ECM to accelerator position sensor. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| Less than 10 ohms | Repair or replace the accelerator position sensor wiring. |
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CAUTION
To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 1C – Check the accelerator position resistance. | ||
|---|---|---|
Conditions
Action
Note: Take the measurement when the pedal is depressed and again when released. Note: Install a 3-pin or other applicable part repair connector, Part Number 3823255, into the accelerator position sensor for idle validation sensor; a 6-pin repair connector, Part Number 3824910, for integrated sensor switch. |
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| OK | NOT OK | |
| 2000 to 3000 ohms | Replace the accelerator position sensor. Refer to the OEM troubleshooting and repair manual. | |
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CAUTION
To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 1D – Check the resistance between sensor pins. | ||
|---|---|---|
Conditions
Action
Note: Take the measurement when the pedal is depressed and again when released. Note: Install a 3-pin or other applicable part repair connector, Part Number 3823255, into the accelerator position sensor for idle validation sensor; a 6-pin repair connector, Part Number 3824910, for integrated sensor switch. |
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| 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.
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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
Action
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| OK | NOT OK |
| No damaged pins | Repair the damaged pins.
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CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
| Guided Step 2B – Check the resistance between the positive (+) 5 VDC supply and return wires. | ||
|---|---|---|
Conditions
Action
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| OK | NOT OK | |
| 2000 to 3000 ohms | Repair or replace the OEM harness. Refer to the OEM troubleshooting and repair manual. | |
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CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
| Guided Step 2C – Check the resistance in the positive (+) 5 VDC supply wire and the signal wire circuit. | ||
|---|---|---|
Conditions
Action
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| 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. | |
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CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
| 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
Action
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| 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.
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CAUTION
To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 3A – Check for the appropriate ECM response. | ||
|---|---|---|
Conditions
Action
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| OK | NOT OK | |
| Fault Code 131 inactive, Fault Code 132 active | Replace the ECM. Refer to Procedure 019-031. | |
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CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
| Guided Step 3B – Check ECM signal pin resistance. | ||
|---|---|---|
Conditions
Action
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| 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
Action
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| 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
Action
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| OK | NOT OK |
| All fault codes cleared | Troubleshoot any remaining active fault codes. |
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Repair complete
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Appropriate troubleshooting chart
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