P2121/19

DTC Code	DTC Name
P2121/19	Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance

DESCRIPTION

Tech Tips

This is the repair procedure for the accelerator pedal position sensor.
This electrical throttle system does not use a throttle cable.
This accelerator pedal position sensor is a non-contact type.

The accelerator pedal position sensor is mounted on the accelerator pedal and detects the opening angle of the accelerator pedal. Since this sensor is electronically controlled with Hall-effect elements, accurate control and reliability can be obtained. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor.

In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA and VPA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and the VPA2 is a signal to indicate the information about the opening angle which is used for detecting malfunctions. The ECM judges the current opening angle of the accelerator pedal using signals from terminals VPA and VPA2, and the ECM controls the throttle motor based on these signals.

DTC No.	DTC Detection Condition	Trouble Area
P2121/19	Condition (a) continues for 0.5 seconds: (a) Difference between VPA1 and VPA2 exceeds the threshold (1 trip detection logic)	Accelerator pedal position sensor circuit Accelerator pedal position sensor ECM

DTC No.

DTC Detection Condition

Trouble Area

P2121/19

Condition (a) continues for 0.5 seconds:

(a) Difference between VPA1 and VPA2 exceeds the threshold

(1 trip detection logic)

Accelerator pedal position sensor circuit
Accelerator pedal position sensor
ECM

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

When using intelligent tester:

PROCEDURE

READ VALUE USING ACCELERATOR PEDAL POSITION SENSOR

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / Data List / Accel Position 1 and Accel Position 2.

Read the values.

Standard voltage

Accelerator Pedal	Accel Position 1	Accel Position 2
Released	0.6 to 1.0 V	1.4 to 1.8 V
Depressed	2.9 to 4.2 V	3.7 to 5.0 V

OK

REPLACE ECM

NG

CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)

Disconnect the B1 sensor connector.
Disconnect the B9 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

Tester Connection

Specified Condition

B1-1 (VCP2) - B9-27 (VCP2)

B1-2 (EP2) - B9-29 (EPA2)

B1-3 (VPA2) - B9-23 (VPA2)

B1-4 (VCP1) - B9-20 (VCPA)

B1-5 (EP1) - B9-28 (EPA)

B1-6 (VPA1) - B9-22 (VPA)

Below 1 Ω

B1-1 (VCP2) or B9-27 (VCP2) - Body ground

B1-2 (EP2) or B9-29 (EPA2) - Body ground

B1-3 (VPA2) or B9-23 (VPA2) - Body ground

B1-4 (VCP1) or B9-26 (VCPA) - Body ground

B1-5 (EP1) or B9-28 (EPA) - Body ground

B1-6 (VPA1) or B9-22 (VPA) - Body ground

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

When not using intelligent tester: