Toyota Yaris: Sfi System / Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled (P21352B)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled (P21352B)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P21352B

Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled

The difference between the output voltage of VTA1 and VTA2 is 0.02 V or less for 2 seconds or more (1 trip detection logic).

  • Throttle position sensor (throttle body with motor assembly)
  • Short between VTA1 and VTA2 circuits
  • Open in ETA circuit
  • Open in VCTA circuit
  • ECM

Comes on

SAE: P2135

MONITOR DESCRIPTION

VTA1 and VTA2 should never be close to the same voltage. If the difference between the value of VTA1 and VTA2 is 0.02 V or less for 2 seconds or more, the ECM will determine there is a short in the sensor circuit, illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON [A].
  7. Turn the GTS on.
  8. Start the engine.
  9. With the vehicle stationary, fully depress and release the accelerator pedal [B].
  10. Idle the engine for 2 seconds or more [C].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
  12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  14. Input the DTC: P21352B.
  15. Check the DTC judgment result.

    GTS Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

FAIL-SAFE

When this DTC is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 7.5° throttle valve opening angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

WIRING DIAGRAM

Refer to DTC P012011.

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 (THROTTLE POSITION SENSOR VOLTAGE)

(a) Read the values displayed on the GTS.

Powertrain > Engine > Data List

Tester Display

Throttle Position Sensor No.1 Voltage

Throttle Position Sensor No.2 Voltage

Result

Proceed to

The value of Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage are below 0.56 V

A

The value of Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage are higher than 4.535 V

B

The value of Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage are 0.56 V or higher, and 4.535 V or less

C

B

GO TO STEP 4

C

GO TO STEP 6

A

2.

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

(a) Disconnect the throttle body with motor 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

D19-5(VC) - D104-109(VCTA)

Always

Below 1 Ω

D19-6(VTA) - D104-108(VTA1)

Always

Below 1 Ω

D19-4(VTA2) - D104-87(VTA2)

Always

Below 1 Ω

D19-3(E2) - D104-110(ETA)

Always

Below 1 Ω

D19-5(VC) or D104-109(VCTA) - Body ground and other terminals

Always

10 kΩ or higher

D19-6(VTA) or D104-108(VTA1) - Body ground and other terminals

Always

10 kΩ or higher

D19-4(VTA2) or D104-87(VTA2) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR)

(a) Disconnect the throttle body with motor assembly connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

D19-5(VC) - D19-3(E2)

Ignition switch ON

4.5 to 5.5 V

*a

Front view of wire harness connector

(to Throttle Body with Motor Assembly)

OK

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

NG

REPLACE ECM

4.

CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the throttle body with motor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D19-3(E2) - Body ground

Always

Below 1 Ω

OK

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

NG

5.

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

(a) Disconnect the throttle body with motor 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

D19-5(VC) - D104-109(VCTA)

Always

Below 1 Ω

D19-6(VTA) - D104-108(VTA1)

Always

Below 1 Ω

D19-4(VTA2) - D104-87(VTA2)

Always

Below 1 Ω

D19-3(E2) - D104-110(ETA)

Always

Below 1 Ω

D19-5(VC) or D104-109(VCTA) - Other terminals

Always

10 kΩ or higher

D19-6(VTA) or D104-108(VTA1) - Other terminals

Always

10 kΩ or higher

D19-4(VTA2) or D104-87(VTA2) - Other terminals

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT)

(a) Disconnect the throttle body with motor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D19-6(VTA) - D19-4(VTA2)

Always

10 kΩ or higher

OK

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

NG

7.

CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT)

(a) Disconnect the throttle body with motor 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

D19-6(VTA) - D19-4(VTA2)

Always

10 kΩ or higher

HINT:

If the resistance changes when the ECM connector is disconnected, there is an internal short in the ECM.

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE POSITION SENSOR - ECM)

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