P2127

P2127, P2128 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.


On Board Diagnosis Logic

These self-diagnoses have the one trip detection logic.






FAIL-SAFE MODE

When the malfunction is detected, ECM enters fail-safe mode and the MIL illuminates.







DTC Confirmation Procedure

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


Diagnosis Procedure


1. CHECK GROUND CONNECTIONS

1.Turn ignition switch OFF.
2.Loosen and retighten three ground screws on the body, Power Supply And Ground Circuit.





OK or NG
OK- GO TO 2.
NG- Repair or replace ground connections.

2. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

1.Disconnect accelerator pedal position (APP) sensor harness connector.





2.Turn ignition switch ON.





3.Check voltage between APP sensor terminal 1 and ground with
CONSULT or tester.
Voltage: Approximately 5V
OK or NG
OK- GO TO 7.
NG- GO TO 3.

3. 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 1 and ECM terminal 91.
Refer to wiring diagram.
Continuity should exist.
OK or NG
OK- GO TO 4.
NG- Repair open circuit.

4. CHECK THROTTLE POSITION 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 5.
NG- Repair short to ground or short to power in harness or connectors.

5. CHECK THROTTLE POSITION SENSOR

P0222.
OK or NG
OK- GO TO 11.
NG- GO TO 6.

6. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.Replace electric throttle control actuator. Exploded View.
2.Perform Throttle Valve Closed Position Learning.
3.Perform Idle Air Volume Learning.
-INSPECTION END

7. CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check harness continuity between APP sensor terminal 5 and ECM terminal 83.
Refer to Wiring Diagram.
Continuity should exist.
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 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Check harness continuity between ECM terminal 98 and APP sensor terminal 6.
Refer to Wiring Diagram.
Continuity should exist.
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

.
OK or NG
OK- GO TO 11.
NG- GO TO 10.

10. REPLACE ACCELERATOR PEDAL ASSEMBLY

1.Replace accelerator pedal assembly. Component.
2.Perform Accelerator Pedal Released Position Learning.
3.Perform Throttle Valve Closed Position Learning.
4.Perform Idle Air Volume Learning.
-INSPECTION END

11. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
-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 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.





4.If NG, replace accelerator pedal assembly and go to next step.
5.Perform Accelerator Pedal Released Position Learning.
6.Perform Throttle Valve Closed Position Learning.
7.Perform Idle Air Volume Learning.