Engine Controls (Except For California)

DTC P2138 APP SENSOR





Component Description





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 potentiometers which transform the accelerator pedal position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of the accelerator pedal and feed the voltage signals 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 the engine operation such as fuel cut.




CONSULT-III Reference Value in Data Monitor Mode
Specification data are reference values.









On Board Diagnosis Logic
This self-diagnosis has the one trip detection logic.

NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Engine Controls (Except For California) Engine Controls (Except For California).






FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.









DTC Confirmation Procedure

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to SEE Diagnosis Procedure.




Wiring Diagram





Specification data are reference values and are measured between each terminal and ground.

CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.









Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.





2. Loosen and retighten ground screws on the body. Except For California.
- Arrow Indicates Vehicle Front
- Body ground (1)
OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT





1. Disconnect accelerator pedal position (APP) sensor (1) harness connector.
2. Turn ignition switch ON.





3. Check voltage between APP sensor terminal 4 and ground with
CONSULT-III or tester.






OK or NG
OK - GO TO 3.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Turn ignition switch ON.





2. Check voltage between APP sensor terminal 5 and ground with
CONSULT-III or tester.






OK or NG
OK - GO TO 7.
NG - GO TO 4.
4.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 5 and ECM terminal 102. Refer to Wiring Diagram.






OK or NG
OK - GO TO 5.
NG - Repair open circuit.
5.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.






OK or NG
OK - GO TO 6.
NG - Repair short to ground or short to power in harness or connectors.
6.CHECK COMPONENTS
Check the following.
- Crankshaft position sensor (POS) ( Engine Controls (Except For California).)
- Refrigerant pressure sensor ( How To Perform Trouble Diagnosis For Quick And Accurate Repair Manual Air Conditioner.)
- EVAP control system pressure ( Engine Controls (Except For California).)
OK or NG
OK - GO TO 11.
NG - Replace malfunctioning component.
7.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between the following;
ECM terminal 111 and APP sensor terminal 2, ECM terminal 104 and APP sensor terminal 1. Refer to Wiring Diagram.






4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 8.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following;
ECM terminal 110 and APP sensor terminal 3, ECM terminal 103 and APP sensor terminal 6. Refer to Wiring Diagram.






2. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 9.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK APP SENSOR
SEE Component Inspection.
OK or NG
OK - GO TO 11.
NG - GO TO 10.
10.REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Component Removal And Installation.
- INSPECTION END
11.CHECK INTERMITTENT INCIDENT
Except For California Except For California.
- INSPECTION END




Component Inspection

ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.





3. Check voltage between ECM terminals 110 (APP sensor 1 signal), 103 (APP sensor 2 signal) and ground under the following conditions.






4. If NG, replace accelerator pedal assembly and go to next step. Component Removal And Installation.