HYBRID CONTROL SYSTEM, Diagnostic DTC:P2120-152, P2121-106, P2122-104, P2123-105, P2125-153, P2126-109, P2127-107, P2128-108, P2138-110, P2138-154

DTC Code DTC Name
P2120-152 Throttle / Pedal Position Sensor / Switch "D" Circuit
P2121-106 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance
P2122-104 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input
P2123-105 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input
P2125-153 Throttle / Pedal Position Sensor / Switch "E" Circuit
P2126-109 Throttle / Pedal Position Sensor / Switch "E" Circuit Range / Performance
P2127-107 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input
P2128-108 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input
P2138-110 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation
P2138-154 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

DESCRIPTION

The accelerator pedal position sensor is mounted on the accelerator pedal to detect how much the pedal is depressed. This is a non-contact sensor with Hall elements. There are 2 outputs from the sensor. One is used to detect the accelerator pedal position and the other is used as a confirmation to allow the detection of a malfunction in the sensor itself. Voltage is output from the accelerator pedal position sensor to terminals VPA and VPA2 of the EV control ECU. This voltage varies from 0 to 5 V in accordance with the accelerator pedal position. Terminal VPA2 is primarily used to detect a malfunction in the sensor itself. The EV control ECU determines the current accelerator pedal position and controls the hybrid control system based on signals received by terminals VPA and VPA2.

A01MJ1FE33
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P2120-152 Throttle / Pedal Position Sensor / Switch "D" Circuit

Main sensor circuit wiring malfunction or level is not stable:

Main sensor voltage is 0.4 V or less or 4.8 V or more for a certain period of time.

(Both of the following conditions are met: The main sensor voltage is 0.4 V or less for a certain period of time and 4.8 V or more for a certain period of time.)

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2121-106 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance

Internal malfunction in the main sensor:

Main sensor output changes rapidly (detected when there are no circuit malfunctions such as an open or short).

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2122-104 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input

Open or short to ground in the main sensor circuit:

The main sensor voltage is 0.4 V or less for 0.5 seconds.

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2123-105 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input

Short to +B in the main sensor circuit:

The main sensor voltage is 4.8 V or more for 2 seconds.

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2125-153 Throttle / Pedal Position Sensor / Switch "E" Circuit

Sub sensor circuit wiring malfunction or level is not stable:

When the main sensor circuit is normal, the sub sensor voltage is 1.2 V or less or 4.8 V or more for a certain period of time.

(Both of the following conditions are met: Sub sensor voltage is 1.2 V or less for a certain period of time, and the main sensor is normal and sub sensor voltage is 4.8 V or more for a certain period of time.)

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2126-109 Throttle / Pedal Position Sensor / Switch "E" Circuit Range / Performance

Internal malfunction of the sub sensor:

Sub sensor output changes rapidly (detected when there are no circuit malfunctions such as an open or short).

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2127-107 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input

Open or short to ground in the sub sensor circuit:

The sub sensor voltage is 1.2 V or less for 0.5 seconds.

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2128-108 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input

Short to +B in the sub sensor circuit:

Main sensor is normal and sub sensor voltage is 4.8 V or more for 2 seconds.

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2138-110 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

Difference between the main sensor value and sub sensor value is large.

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
P2138-154 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

Main or sub sensor circuit wiring malfunction:

The difference in voltage between the main sensor and sub sensor is 0.02 V or less, or a low output malfunction continues in both the main and sub sensors for a certain period of time.

(1 trip detection logic)

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • EV control ECU

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P2120-152

  • Accel Pedal Position No.1

  • Accel Pedal Position No.2
P2121-106
P2122-104
P2123-105
P2125-153
P2126-109
P2127-107
P2128-108
P2138-110
P2138-154

WIRING DIAGRAM

A01MGS7E19
*a Accelerator Pedal Sensor Assembly
*b EV Control ECU

CAUTION / NOTICE / HINT

Note

When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Wait for approximately 10 seconds with the power switch on (READY) and the shift lever in P, then fully depress and release the accelerator pedal several times.

PROCEDURE


  1. READ VALUE USING GTS (ACCEL PEDAL POSITION NO.1, ACCEL PEDAL POSITION NO.2)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / EV / Data List / Accel Pedal Position No.1, Accel Pedal Position No.2.


      Powertrain > EV > Data List
      Tester Display
      Accel Pedal Position No.1
      Accel Pedal Position No.2

    4. Read the Data List.

      Standard
      Tester Display Accelerator Pedal Condition Specified Condition
      Accel Pedal Position No.1 Not depressed 10 to 22%
      Fully depressed 52 to 90%
      Not depressed → Fully depressed → Not depressed (Accelerator pedal should be operated slowly) Value changes progressively
      Accel Pedal Position No.2 Not depressed 24 to 40%
      Fully depressed 68 to 99%
      Not depressed → Fully depressed → Not depressed (Accelerator pedal should be operated slowly) Value changes progressively

    5. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK CONNECTOR CONNECTION CONDITION (ACCELERATOR PEDAL SENSOR ASSEMBLY CONNECTOR)


    1. A01MHQHC01
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the accelerator pedal sensor assembly connector.

      Click here

      OK
      The connectors are connected securely and there are no contact pressure problems.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT SECURELY

    OK

  3. CHECK CONNECTOR CONNECTION CONDITION (EV CONTROL ECU CONNECTOR)

    Result
    Proceed to
    OK
    NG

    1. A01MGTOC01
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the EV control ECU connectors.

      Click here

      OK
      The connectors are connected securely and there are no contact pressure problems.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT SECURELY

    OK

  4. CHECK EV CONTROL ECU (CHECK VOLTAGE)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Turn the power switch on (IG).

    3. A01MHUJC07
      *a

      Front view of wire harness connector

      (to Accelerator Pedal Sensor Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A15-4 (VCPA) - A15-5 (EPA) Power switch on (IG) 4.5 to 5.5 V
      A15-1 (VCP2) - A15-2 (EPA2) Power switch on (IG) 4.5 to 5.5 V

    4. Turn the power switch off.

    5. Reconnect the accelerator pedal sensor assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - ACCELERATOR PEDAL SENSOR ASSEMBLY) Click here

    OK

  5. CHECK EV CONTROL ECU (CHECK RESISTANCE)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. A01MHUJC08
      *a

      Front view of wire harness connector

      (to Accelerator Pedal Sensor Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A15-6 (VPA) - A15-5 (EPA) Power switch off 36.60 to 41.61 kΩ
      A15-3 (VPA2) - A15-2 (EPA2) Power switch off 36.60 to 41.61 kΩ

    3. Reconnect the accelerator pedal sensor assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

    NG

  6. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - ACCELERATOR PEDAL SENSOR ASSEMBLY)


    1. Disconnect the EV control ECU connector.

    2. Disconnect the accelerator pedal sensor assembly connector.

    3. Turn the power switch on (IG).

    4. A01MJJTC06
      *a

      Rear view of wire harness connector

      (to EV Control ECU)
      *b

      Front view of wire harness connector

      (to Accelerator Pedal Sensor Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A28-30 (VPA) - Body ground Power switch on (IG) Below 1 V
      A28-28 (VPA2) - Body ground Power switch on (IG) Below 1 V
      A28-20 (EPA) - Body ground Power switch on (IG) Below 1 V
      A28-18 (EPA2) - Body ground Power switch on (IG) Below 1 V

      Note

      Turning the power switch on (IG) with the EV control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    5. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A28-30 (VPA) - A15-6 (VPA) Power switch off Below 1 Ω
      A28-20 (EPA) - A15-5 (EPA) Power switch off Below 1 Ω
      A28-28 (VPA2) - A15-3 (VPA2) Power switch off Below 1 Ω
      A28-18 (EPA2) - A15-2 (EPA2) Power switch off Below 1 Ω
      A28-30 (VPA) or A15-6 (VPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A28-20 (EPA) or A15-5 (EPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A28-28 (VPA2) or A15-3 (VPA2) - Body ground and other terminals Power switch off 10 kΩ or higher
      A28-18 (EPA2) or A15-2 (EPA2) - Body ground and other terminals Power switch off 10 kΩ or higher

    7. Reconnect the accelerator pedal sensor assembly connector.

    8. Reconnect the EV control ECU connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE EV CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - ACCELERATOR PEDAL SENSOR ASSEMBLY)


    1. Disconnect the EV control ECU connector.

    2. Disconnect the accelerator pedal sensor assembly connector.

    3. Turn the power switch on (IG).

    4. A01MJJTC07
      *a

      Rear view of wire harness connector

      (to EV Control ECU)
      *b

      Front view of wire harness connector

      (to Accelerator Pedal Sensor Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A28-9 (VCPA) - Body ground Power switch on (IG) Below 1 V
      A28-20 (EPA) - Body ground Power switch on (IG) Below 1 V
      A28-8 (VCP2) - Body ground Power switch on (IG) Below 1 V
      A28-18 (EPA2) - Body ground Power switch on (IG) Below 1 V

      Note

      Turning the power switch on (IG) with the EV control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    5. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A28-9 (VCPA) - A15-4 (VCPA) Power switch off Below 1 Ω
      A28-20 (EPA) - A15-5 (EPA) Power switch off Below 1 Ω
      A28-8 (VCP2) - A15-1 (VCP2) Power switch off Below 1 Ω
      A28-18 (EPA2) - A15-2 (EPA2) Power switch off Below 1 Ω
      A28-9 (VCPA) or A15-4 (VCPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A28-20 (EPA) or A15-5 (EPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A28-8 (VCP2) or A15-1 (VCP2) - Body ground and other terminals Power switch off 10 kΩ or higher
      A28-18 (EPA2) or A15-2 (EPA2) - Body ground and other terminals Power switch off 10 kΩ or higher

    7. Reconnect the accelerator pedal sensor assembly connector.

    8. Reconnect the EV control ECU connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE EV CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR