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

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DESCRIPTION

HINT:

This DTC is related to the accelerator pedal position sensor.

Refer to DTC P2120/19 (Click here).

DTC No.	DTC Detection Condition	Suspected Area
P2121/19	Conditions (a) and (b) continue for 0.5 seconds: (a) Difference between VPA1 and VPA2 exceeds the threshold (b) IDL is OFF	Accelerator pedal position sensor circuit Accelerator pedal position sensor ECM

MONITOR DESCRIPTION

When the difference between voltage outputs of VPA1 and VPA2 deviates from the standard range, the ECM concludes that there is a defect in the accelerator pedal position (APP) sensor. The ECM illuminates the MIL and sets a DTC.
This monitor runs for 1 second (the first second of engine idle) after the engine is started.

FAIL-SAFE

The accelerator pedal position sensor has a main circuit and associated circuit. When one circuit is malfunctioning, the accelerator pedal position is calculated by the output of the other circuit. When both of the circuits are malfunctioning, it is interpreted that the accelerator pedal is released. As a result, throttle valve is closed and engine idles.

WIRING DIAGRAM

Refer to DTC P2120/19 (Click here).

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

When using intelligent tester:

1.READ DATA LIST (ACCELERATOR POSITION NO. 1, ACCELERATOR POSITION NO. 2)

Connect the intelligent tester to the DLC3.

Turn the ignition switch ON and turn the intelligent tester ON.

Enter the following menus: Powertrain / Engine and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

Read the values.
Standard voltage:
Accelerator Pedal
Accelerator Position No. 1
Accelerator Position No. 2
Released
0.5 to 1.1 V
1.2 to 2.0 V
Depressed
2.6 to 4.5 V
3.4 to 5.0 V

REPLACE ECM

NG

2.CHECK WIRE HARNESS (ACCELERATOR PEDAL POSITION SENSOR - ECM)

Disconnect the A13 accelerator pedal position sensor connector.

Disconnect the E9 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection	Specified Condition
A13-6 (VPA1) - E9-18 (VPA)	Below 1 Ω
A13-5 (EP1) - E9-20 (EPA)	Below 1 Ω
A13-4 (VCP1) - E9-26 (VCPA)	Below 1 Ω
A13-3 (VPA2) - E9-19 (VPA2)	Below 1 Ω
A13-2 (EP2) - E9-21 (EPA2)	Below 1 Ω
A13-1 (VCP2) - E9-27 (VCP2)	Below 1 Ω
A13-6 (VPA1) or E9-18 (VPA) - Body ground	10 kΩ or higher
A13-5 (EP1) or E9-20 (EPA) - Body ground	10 kΩ or higher
A13-4 (VCP1) or E9-26 (VCPA) - Body ground	10 kΩ or higher
A13-3 (VPA2) or E9-19 (VPA2) - Body ground	10 kΩ or higher
A13-2 (EP2) or E9-21 (EPA2) - Body ground	10 kΩ or higher
A13-1 (VCP2) or E9-27 (VCP2) - Body ground	10 kΩ or higher

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE ACCELERATOR PEDAL ROD

When not using intelligent tester:

1.CHECK ECM (VPA, VPA2 VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connector.

Standard voltage:

Tester Connection	Accelerator Pedal Condition	Specified Condition
E9-18 (VPA) - E9-20 (EPA)	Released	0.5 to 1.1 V
E9-18 (VPA) - E9-20 (EPA)	Depressed	2.5 to 4.6 V
E9-19 (VPA2) - E9-21 (EPA2)	Released	1.5 to 2.9 V
E9-19 (VPA2) - E9-21 (EPA2)	Depressed	3.5 to 5.0 V