Accelerator Pedal Position Sensor: Testing and Inspection

OPERATION
- The accelerator pedal position sensor converts the amount the accelerator pedal is depressed into a voltage and inputs this to the traction control module. The traction control module uses this signal for traction control.
- 5 volts from the engine control module is supplied to one end of the resistor in the accelerator pedal position sensor, and the other end (ground terminal) is grounded at the engine control module.
- When the accelerator pedal is depressed, resistance between the accelerator pedal position sensor output terminal (variable resistance terminal) and the ground terminal increases according to the amount the pedal is depressed. As a result, the accelerator pedal position sensor output voltage also increases as to the accelerator pedal being pressed.

TROUBLESHOOTING HINT
If accelerator pedal position sensor output voltage deviates from the standard value, adjust the accelerator pedal position sensor first, and then recheck.











HARNESS INSPECTION

SENSOR INSPECTION





(1) Disconnect the accelerator pedal position sensor connector.

NOTE:
*1: (Up to 1995 models)
*2: (From 1996 models)





(2) Measure resistance between terminal (4) (sensor ground) and terminal (1) (sensor power).

Standard value: 3.5-6.5 kohms





(3) Connect a pointer type ohmmeter between terminal (1) (sensor ground) and terminal (2) (sensor output).
(4) Operate the throttle valve slowly from the idle position to the full open position and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
(5) If the resistance is out of specification, or fails to change smoothly, replace the accelerator position sensor.

Accelerator pedal position sensor installation torque: 2.0 Nm (1.5 ft.lbs.)

For the accelerator pedal position sensor adjusting procedure, refer to database.