Code No. P2128: Accelerator Pedal Position Sensor (Sub) Circuit High Input

OPERATION

• A power voltage of 5 V is applied to the accelerator pedal position sensor (terminal No. 4) from the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 102).
  
• The power voltage is earthed to the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 120) from the accelerator pedal position sensor (terminal No. 5).
  
• The sensor signal is inputted to the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 107) from the accelerator pedal position sensor output terminal (terminal No. 6).
  

FUNCTION

• The accelerator pedal position sensor (sub) outputs voltage which corresponds to the accelerator pedal depression.
  
• The engine-ECU <M/T> or engine-A/T-ECU <A/T> checks whether the voltage is within a specified range.
  

TROUBLE JUDGMENT

• Ignition switch is in ON position.
  
• Accelerator pedal position sensor (main) output voltage is 0.2 - 2.5 V.
  
• Battery positive voltage is 6.3 V or higher.
  

• Accelerator pedal position sensor (main) output voltage is 4.8 V or higher.
  

PROBABLE CAUSES

• Failed accelerator pedal position sensor
  
• Open circuit in accelerator pedal position sensor circuit or loose connector contact
  
• Failed engine-ECU <M/T> or engine-A/T-ECU <A/T>
  

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Go to Step 2 .

	Go to Step 3 .

	Repair or replace the connector.

	Go to Step 7 .

	Go to Step 4 .

	Go to Step 5 .

	Repair or replace the connector.

	Go to Step 6 .

	Repair the damaged harness wire.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.

	Check end.

	Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.