The accelerator pedal position sensor is installed on the upper end of the accelerator pedal assembly. The sensor detects the accelerator position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors are a kind of potentiometer which transform the accelerator pedal position into output voltage, and emit the voltage signal to the ECM.
The ECM judges the current opening angle of the accelerator pedal from these signals and controls the throttle control motor based on these signals.
Idle position of the accelerator pedal is determined by the ECM receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for engine operations such as fuel cut.
DTC Logic
DTC DETECTION LOGIC
NOTE: If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to See: P0643.
DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
>> GO TO 2. 2.PERFORM DTC CONFIRMATION PROCEDURE
Start engine and let it idle for 1 second.
Check DTC. Is DTC detected?
YES >> Go to Diagnosis Procedure.
NO >> Inspection END
YES >> GO TO 2.
NO >> Repair or replace ground connection. 2.CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
Disconnect accelerator pedal position (APP) sensor harness connector.
Turn ignition switch ON.
Check the voltage between APP sensor harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 3.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
Turn ignition switch ON.
Check the voltage between APP sensor harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 7.
NO >> GO TO 4. 4.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between APP sensor harness connector and ECM harness connector.
Is the Inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit. 5.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the Inspection result normal?
YES >> GO TO 6.
NO >> Repair short to ground or short to power in harness or connectors. 6.CHECK COMPONENTS
Check the following.
Crankshaft position sensor (POS) (Refer to See: P0335.)
EVAP control system pressure sensor (Refer to See: P0451.)
YES >> GO TO 11.
NO >> Replace malfunctioning components. 7.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between APP sensor harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 8.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 8.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
Check the continuity between APP sensor harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 9.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 9.CHECK APP SENSOR
Refer to Component Inspection.
Is the Inspection result normal?
YES >> GO TO 11.
NO >> GO TO 10. 10.REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly.
Refer to Special Repair Requirement. >> Inspection END
