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Accelerator Pedal Circuit
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Overview
IVS
| CODE | REASON | EFFECT |
| Fault Code: 432 PID: P091 SPN: 91 FMI: 11 LAMP: Red SRT: 00-612 |
Voltage detected at idle validation on-idle signal pin 6 of the OEM harness when voltage at accelerator position signal pin 11 of OEM harness indicates pedal is not at idle or voltage detected at idle validation off-idle signal pin 9 of the OEM harness when voltage at accelerator position signal pin 11 of the OEM harness indicates pedal is at rest. |
Engine will only idle. |
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Accelerator Pedal Circuit |
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Circuit Description
The accelerator pedal assembly relays the accelerator percentage needed to the electronic control module (ECM).
Component Location
The accelerator position sensor is located on the accelerator pedal.
Shop Talk
Confirm that the idle validation switch is properly calibrated. Refer to the manufacturer’s procedures for adjustment information.
- Make sure there are no external circuits hooked into the accelerator position sensor circuit and that there are no signs of tampering in the circuit.
- If all the wiring and the sensor checks look good, replace the accelerator position sensor and the idle validation switch circuit wires, between the accelerator pedal and 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 openings in the bulkhead around the connector and the wires to prevent toxic and noxious fumes from seeping into the operator area.
Note: Verify that the three accelerator position sensor circuit wires are twisted together. Verify that the three idle validation switch circuit wires are twisted together.
- The ECM and accelerator pedal assembly must be electrically calibrated to each other for proper engine response. The ECM and accelerator pedal assembly must be calibrated when an accelerator pedal is initially installed, replaced, when an ECM is replaced, when a new calibration is downloaded to the ECM, and when the accelerator pedal wiring is disconnected while the vehicle keyswitch is ON.
- With keyswitch ON, gradually push the accelerator to the floor and release. Depress and release the accelerator pedal three times. This procedure will recalibrate the ECM and accelerator pedal.
- Confirm with OEM that the throttle is within OEM specifications for accelerator position sensor voltage or resistance at idle to off-idle transition.
- Depressing the throttle while starting the engine is not
necessary nor advised. Additional fueling is not possible until the engine reaches idle, and in older versions of software, depressing the throttle could cause Fault Code 432 in some situations.
Cautions and Warnings
 CAUTION To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
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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 pin and harness damage, use the following test leads when taking a measurement: |
|
CAUTION To reduce the possibility of damaging the 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 lead 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 accelerator connector pins. | No damaged pins | |
| STEP 1B. Check the resistance of the accelerator position sensor. | Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms | |
| STEP 1C. Check for an open circuit of the accelerator position sensor supply and return circuits. | 2000 to 3000 ohms | |
| STEP 1D. Check for a short circuit to ground in the accelerator position sensor. | More than 100k ohms | |
| STEP 1E. Check percentage of accelerator pedal. | 3 to 10 percent | |
| STEP 2. | Check the OEM harness. | |
| STEP 2A. Inspect the OEM harness, bulkhead connector, and ECM connector pins. | No damaged pins | |
| STEP 2B. Check for an open circuit in the OEM harness. | Less than 10 ohms | |
| STEP 2C. Check for a short circuit to ground. | More than 100k ohms | |
| STEP 2D. Check for a short circuit from pin to pin. | More than 100k ohms | |
| STEP 3. | Check the ECM. | |
| STEP 3A. Check the voltage supply. | 4.75 to 5.25 VDC | |
| STEP 3B. Measure the accelerator position signal voltage. | Less than 1 VDC | |
| STEP 4. | Clear the fault codes. | |
| STEP 4A. Disable the fault code. | Fault Code 432 inactive | |
| STEP 4B. Clear the inactive fault codes. | All fault codes cleared | |
Guided Step 1 – Check the accelerator pedal.
| Guided Step 1A – Inspect the accelerator connector pins. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
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No damaged pins |
Repair or replace the accelerator pedal assembly.
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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 the resistance of the accelerator position sensor. | ||
|---|---|---|
Conditions
Action
Note: Resistance when the pedal is released must be at least 1000 ohms greater than when it is depressed. Note: Install a 3-pin repair connector, Part Number 3823255, into the accelerator position sensor for idle validation switch. |
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| OK | NOT OK | |
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Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms |
Replace the accelerator pedal assembly. 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 1C – Check for an open circuit of the accelerator position sensor supply and return circuits. | ||
|---|---|---|
Conditions
Action
Note: Install a 3-pin repair connector, Part Number 3823255, into the accelerator position sensor for idle validation switch. |
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| OK | NOT OK | |
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2000 to 3000 ohms |
Replace the accelerator pedal assembly. 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 for a short circuit to ground in the accelerator position sensor. | ||
|---|---|---|
Conditions
Action
Note: Install a 3-pin repair connector, Part Number 3823255, into the accelerator position sensor for idle validation switch. |
|
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| OK | NOT OK | |
|
More than 100k ohms |
Replace the accelerator pedal assembly. Refer to the OEM troubleshooting and repair manual. |
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| Guided Step 1E – Check percentage of accelerator pedal. | |
|---|---|
Conditions
Action
|
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| OK | NOT OK |
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3 to 10 percent |
Replace accelerator pedal assembly. Refer to OEM manufacturer for repair procedures. |
Guided Step 2 – Check the OEM harness.
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CAUTION To reduce the possibility of damaging the new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
| Guided Step 2A – Inspect the OEM harness, bulkhead connector, and ECM connector pins. | |
|---|---|
Conditions
Action
|
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| OK | NOT OK |
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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 2B – Check for an open circuit in the OEM harness. | ||
|---|---|---|
Conditions
Action
|
|
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| OK | NOT OK | |
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Less than 10 ohms |
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 for a short circuit to ground. | ||
|---|---|---|
Conditions
Action
|
|
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| OK | NOT OK | |
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More than 100k ohms |
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 2D – Check for a short circuit from pin to pin. | ||
|---|---|---|
Conditions
Action
|
|
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| OK | NOT OK | |
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More than 100k ohms |
Replace the OEM harness. Refer to the OEM troubleshooting and repair manual. |
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Guided Step 3 – Check the ECM.
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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 lead when taking a measurement: |
| Guided Step 3A – Check the voltage supply. | ||
|---|---|---|
Conditions
Action
|
|
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| OK | NOT OK | |
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4.75 to 5.25 VDC |
Replace the ECM. Refer to Procedure 019-031. |
|
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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 lead when taking a measurement: |
| Guided Step 3B – Measure the accelerator position signal voltage. | ||
|---|---|---|
Conditions
Action
|
|
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| OK | NOT OK | |
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Less than 1 VDC |
Replace the ECM. Refer to Procedure 019-031. |
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Guided Step 4 – Clear the fault codes.
| Guided Step 4A – Disable the fault code. | ||
|---|---|---|
Conditions
Action
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| OK | NOT OK | |
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Fault Code 432 inactive |
Fault Code 432 active. |
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| Guided Step 4B – Clear the inactive fault codes. | |
|---|---|
Conditions
Action
|
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| OK | NOT OK |
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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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