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Electronic Control System Gas Plus Engines – FAULT CODE 432

Accelerator Pedal or Lever Idle Validation Circuit – Out of Calibration

Overview

CODE REASON EFFECT
Fault Code: 432
PID: S230
SPN: 558
FMI: 13/13
LAMP: Red
SRT: 

Accelerator Pedal or Lever Idle Validation Circuit – Out of Calibration. Voltage at idle validation on-idle and off-idle circuit does not match accelerator pedal position.

Engine will only idle.

Accelerator Pedal or Lever Idle Validation Circuit
SMALL | MEDIUM | LARGE

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 or released. The accelerator pedal or lever position circuit contains three wires: accelerator pedal or lever position supply, accelerator pedal or lever position return, accelerator pedal or lever position signal. The switch return circuit for the on-idle and off-idle validation circuit is a shared return with other OEM switches.

Component Location

The accelerator pedal or lever position sensor is located on the accelerator pedal or lever.

Shop Talk

This fault is logged when both the on- idle and off-idle validation switches disagree with the accelerator pedal or lever position signal. Turning the keyswitch ON while partially depressing the accelerator pedal or lever can cause this fault code to go active. This fault will stay active until the pedal or lever is cycled through its full travel.

Cautions and Warnings

 WARNING 

On automotive applications, set the service brake using the trailer brake hand valve. Make sure there is enough air pressure to activate the brake pressure switch. Securely chock the wheels. Truck movement during troubleshooting can cause severe equipment damage, personal injury or death.
 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 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3823993 – male Deutsch test lead
Part Number 3823996 – female Weather-Pack test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the fault codes.  
  STEP 1A. Check for an active fault code. Fault Code 432 active?
STEP 2. Check the OEM harness.  
  STEP 2A. Inspect the engine harness and ECM connector pins. Dirty or damaged pins?
  STEP 2B. Check the accelerator pedal or lever position sensor resistance. 1500 to 3000 ohms (released), 250 to 1500 ohms (depressed)?
  STEP 3B-1. Check the resistance of the accelerator pedal or lever position sensor.
  STEP 2C. Check for a pin to pin short. Greater than 100k ohms?
STEP 3. Check the fault codes.  
  STEP 3A. Perform the fault code disable procedure Fault Code 432 active?
STEP 4. Clear the fault codes.  
  STEP 4A. Disable the fault codes. Fault Code 423 inactive?
  STEP 4B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the fault codes.

Guided Step 1A – Check for an active fault code.

Conditions

  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 432 active?
YES NO
No Repair No Repair

Guided Step 2 – Check the OEM harness.

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

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness from the ECM connector 2.

Action

  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Wire insulation damaged
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Connector shell broken
  • Dirt or debris in or on the connector pins.

For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure 019-361.

Dirty or damaged pins?
YES NO

A defective connection has been detected in the ECM connector or engine harness connector.

Repair the damaged pins.

Repair or replace the engine harness, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the engine harness. Refer to Procedure 019-204.
  • Replace the engine harness. Refer to Procedure 019-043.
No Repair

Guided Step 2B – Check the accelerator pedal or lever position sensor resistance.

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine harness from ECM connector 2.

Action

  • Measure the resistance between the accelerator pedal or lever position SIGNAL pin and accelerator pedal or lever position 5 volt SUPPLY pin at the ECM connector of the OEM harness.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general resistance measurement techniques, refer to Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360.

1500 to 3000 ohms released, 250 to 1500 ohms depressed?

Released value must be at least 1000 ohms greater than depressed value.
YES NO
No Repair No Repair

Guided Step 2B-1 – Check the resistance of the accelerator pedal or lever position sensor.

Conditions

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

Action

  • Measure the resistance between the accelerator pedal or lever position SIGNAL pin and accelerator pedal or lever position 5 volt SUPPLY pin at the accelerator pedal or lever position sensor connector.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general resistance measurement techniques, refer to Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360.

1500 to 3000 ohms released, 250 to 1500 ohms depressed?

Released value must be at least 1000 ohms greater than depressed value.
YES NO

Repair the damaged pins.

Repair or replace the OEM or engine harness, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Replace the OEM harness. Refer to Procedure 019-071.
  • Repair the engine harness. Refer to Procedure 019-204.
  • Replace the engine harness. Refer to Procedure 019-043.

Replace the accelerator pedal. Refer to the OEM service manual.

Guided Step 2C – Check for a pin to pin short.

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness from the ECM connector 2.

Action

  • Measure the resistance between the accelerator pedal SIGNAL pin in the engine harness and all other pins in the ECM connector 1.
  • Measure the resistance between the accelerator pedal SIGNAL pin in the engine harness and all other pins in the ECM connector 2.
  • Measure the resistance between the accelerator pedal position 5 volt SUPPLY pin in the engine harness and all other pins in the ECM connector 1.
  • Measure the resistance between the accelerator pedal position 5 volt SUPPLY pin in the engine harness and all other pins in the ECM connector 2.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general resistance measurement techniques, refer to Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360.
SMALL | MEDIUM | LARGE

Greater than 100k ohms?
YES NO
No Repair

Repair the damaged pins.

Repair or replace the OEM or engine harness, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Replace the OEM harness. Refer to Procedure 019-071.
  • Repair the engine harness. Refer to Procedure 019-204.
  • Replace the engine harness. Refer to Procedure 019-043.

Guided Step 3 – Check the fault codes.

Guided Step 3A – Perform the fault code disable procedure.

Conditions

  • Turn keyswitch ON
  • Connect all components
  • Connect INSITE™ electronic service tool.

Action

  • Slowly depress the accelerator pedal or lever to the full throttle position and release it completely three times.
  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 432 active?
YES NO
No Repair

Replace the accelerator pedal or lever assembly. Refer to the equipment manufacturer’s troubleshooting and repair manual.

Guided Step 4 – Clear the fault code.

Guided Step 4A – Disable the fault code.

Conditions

  • Connect all components
  • Connect INSITE™ electronic service tool.

Action

  • Turn the keyswitch ON and completely depress and release the accelerator pedal or lever three times.
  • Turn the keyswitch OFF for 30 seconds.
  • Start the engine and let it idle for one minute.
  • Use INSITE™ electronic service tool to verify that Fault Code 432 is inactive.

Fault Code 432 inactive?
YES NO
No Repair No Repair

Guided Step 4B – Clear the inactive fault codes.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to erase the inactive fault codes.

All fault codes cleared?
YES NO
No Repair No Repair
Repair complete
Appropriate troubleshooting steps
Last Modified:  03-Sep-2004
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