Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled (P21382B)

Toyota Corolla Cross (2022-2025) Service Manual / Engine & Hybrid System / M20a-fks (engine Control) / Sfi System / Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled (P21382B)

DESCRIPTION

HINT:

These DTCs relate to the accelerator pedal position sensor.

Refer to DTC P212012.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P21382B

Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled

Diagnosis condition:

  • Ignition switch ON

Abnormal condition:

  • Difference between VPA and VPA2 is 0.02 V or less.

Malfunction time:

  • 2 seconds or more

Trip logic:

  • 1 trip detection logic

Detection conditions:

  • Continuous

Sensors/components used for detection:

  • Accelerator pedal sensor assembly
  • Accelerator pedal sensor assembly
  • Short between VPA and VPA2 circuits
  • ECM

Comes on
  • SAE Code: P2138
  • DTC for Mexico Models: Applies

MONITOR DESCRIPTION

When the ignition switch is turned ON and the difference in the output voltage of VPA and VPA2 is 0.02 V or less for 2 seconds or more, the ECM determines that the accelerator pedal sensor assembly circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P2138: Accelerator pedal position sensor range check (correlation)

Required Sensors/Components (Main)

Accelerator pedal sensor assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

2.0 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

TYPICAL MALFUNCTION THRESHOLDS

Difference between VPA and VPA2 voltages

0.02 V or less

CONFIRMATION DRIVING PATTERN

Refer to DTC P212012.

Click here

FAIL-SAFE

When these DTCs are stored, the ECM enters fail-safe mode. If either of the 2 sensor circuits malfunctions, the ECM limits the engine output. If both of the circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P212012.

Click here

CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the GTS. 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 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.

PROCEDURE

1.

READ VALUE USING GTS (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE AND ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE)

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

(b) Read the values displayed on the GTS.

Result

Proceed to

The value of Accelerator Position Sensor No. 1 and Accelerator Position Sensor No. 2 is approximately 0 V

A

Other than above

B
B

GO TO STEP 5

A

2.

CHECK CONNECTOR CONNECTION CONDITION (ACCELERATOR PEDAL SENSOR ASSEMBLY)

(a) Confirm the connection status of the accelerator pedal sensor assembly connector.

OK:

The connector is securely connected.

OK

GO TO STEP 5

NG

3.

CONNECTOR SECURELY (ACCELERATOR PEDAL SENSOR ASSEMBLY)

(a) Connect the accelerator pedal sensor assembly connector.

NEXT

4.

READ VALUE USING GTS (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE AND ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE)

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

(b) Read the values displayed on the GTS.

OK:

Difference between the value of Accelerator Position Sensor No. 1 and Accelerator Position Sensor No. 2 is 0.02 V or more

NEXT

END

5.

CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN ACCELERATOR PEDAL SENSOR ASSEMBLY CIRCUIT)

(a) Disconnect the accelerator pedal sensor assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A54-6 (VPA) - A54-3 (VPA2)

Always

10 kΩ or higher
OK

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

NG

6.

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

(a) Disconnect the accelerator pedal sensor assembly connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A54-6 (VPA) - A54-3 (VPA2) or A47-55 (VPA) - A47-58 (VPA2)

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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