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 VPA1 and VPA2 of the hybrid vehicle 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 hybrid vehicle control ECU determines the current accelerator pedal position and controls the hybrid control system based on signals received by terminals VPA1 and VPA2. The accelerator pedal position sensor also contains a kickdown circuit. When the accelerator pedal reaches a specified position, the output voltage of VPA1 and VPA2 will jump slightly higher as shown in the illustration that follows.

A000UKNE01
DTC No. INF Code DTC Detection Condition Trouble Area
P2120 152 Main sensor circuit wiring malfunction or level is not stable

  • Wire harness or connector

  • Accelerator pedal sensor assembly

  • Hybrid vehicle control ECU
P2121 106 Internal error of the main sensor
P2122 104 Open or short to GND in the main sensor circuit
P2123 105 Short to +B in the main sensor circuit
P2125 153 Sub sensor circuit wiring malfunction or level is not stable
P2126 109 Internal error of the sub sensor
P2127 107 Open or short to GND in the sub sensor circuit
P2128 108 Short to +B in the sub sensor circuit
P2138 110 Difference between the main sensor value and sub sensor value is large.
P2138 154 Main or sub sensor circuit wiring malfunction

WIRING DIAGRAM

A000UK0E02
*a Accelerator Pedal Sensor Assembly
*b Hybrid Vehicle Control ECU

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACCEL POS #1, ACCEL POS #2)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Data List / Accel Pedal Pos #1, Accel Pedal Pos #2.

    4. Read the data list.

      A000ZVHE02
      Result
      Tester Display Accelerator Pedal Condition Specified Condition
      Accel Pedal Pos #1 Not depressed (8 to 28 %) 0.4 to 1.4 V
      Fully depressed (62 to 92 %) 3.1 to 4.6 V
      Not depressed → Fully depressed → Not depressed (Accelerator pedal should be operated slowly) Value changes progressively as shown in the illustration
      Accel Pedal Pos #2 Not depressed (20 to 44 %) 1.0 to 2.2 V
      Fully depressed (78 to 100 %) 3.9 to 5.0 V
      Not depressed → Fully depressed → Not depressed (Accelerator pedal should be operated slowly) Value changes progressively as shown in the illustration

      Tech Tips


      • 5 V is described as 100% on the tester.

      • The voltage changes when kickdown occurs.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

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


    1. Check the connection of the accelerator pedal sensor assembly connector.

      A000Y8XE01
      *1 for LHD:
      *2 for RHD:
      OK
      The connector is connected securely and there are no contact problems.

    NG

    CONNECT SECURELY

    OK

  3. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)


    1. A000XH7E01
      *1 Hybrid Vehicle Control ECU

      Check the connections of the hybrid vehicle control ECU connectors.

      OK
      The connectors are connected securely and there are no contact problems.

    NG

    CONNECT SECURELY

    OK

  4. CHECK HYBRID VEHICLE CONTROL ECU (CHECK VOLTAGE)


    1. Turn the power switch off.

    2. Disconnect the accelerator pedal sensor assembly connector.

      A000Y8XE01
      *1 for LHD:
      *2 for RHD:

    3. Turn the power switch on (IG).

    4. A000Z7SE01
      *1 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 Switch Condition Specified Condition
      A36-4 (VCPA) - A36-5 (EPA) Power switch on (IG) 4.5 to 5.5 V
      A36-1 (VCP2) - A36-2 (EPA2) Power switch on (IG) 4.5 to 5.5 V

    NG

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

    OK

  5. CHECK HYBRID VEHICLE CONTROL ECU (CHECK RESISTANCE)


    1. A000VZAE01
      *1 Front view of wire harness connector: (to Accelerator Pedal Sensor Assembly)

      Turn the power switch off.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      A36-6 (VPA) - A36-5 (EPA) Power switch off 36.60 to 41.61 kΩ
      A36-3 (VPA2) - A36-2 (EPA2) Power switch off 36.60 to 41.61 kΩ

    OK

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

    NG

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


    1. Turn the power switch off.

    2. A000WMRE01
      *a Rear view of wire harness connector: (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector: (to Accelerator Pedal Sensor Assembly)

      Disconnect connector A76 from the hybrid vehicle control ECU.

    3. Turn the power switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A76-20 (VPA1) - Body ground Power switch on (IG) Below 1 V
      A76-21 (VPA2) - Body ground Power switch on (IG) Below 1 V
      A76-19 (EP1) - Body ground Power switch on (IG) Below 1 V
      A76-18 (EP2) - Body ground Power switch on (IG) Below 1 V

      Note

      Turning the power switch on (IG) with the hybrid vehicle 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 (Check for open)
      Tester Connection Switch Condition Specified Condition
      A76-20 (VPA1) - A36-6 (VPA) Power switch off Below 1 Ω
      A76-19 (EP1) - A36-5 (EPA) Power switch off Below 1 Ω
      A76-21 (VPA2) - A36-3 (VPA2) Power switch off Below 1 Ω
      A76-18 (EP2) - A36-2 (EPA2) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      A76-20 (VPA1) or A36-6 (VPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A76-19 (EP1) or A36-5 (EPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A76-21 (VPA2) or A36-3 (VPA2) - Body ground and other terminals Power switch off 10 kΩ or higher
      A76-18 (EP2) or A36-2 (EPA2) - Body ground and other terminals Power switch off 10 kΩ or higher

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Turn the power switch off.

    2. A000WMRE02
      *a Rear view of wire harness connector: (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector: (to Accelerator Pedal Sensor Assembly)

      Disconnect connector A76 from the hybrid vehicle control ECU.

    3. Turn the power switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A76-22 (VCP1) - Body ground Power switch on (IG) Below 1 V
      A76-19 (EP1) - Body ground Power switch on (IG) Below 1 V
      A76-23 (VCP2) - Body ground Power switch on (IG) Below 1 V
      A76-18 (EP2) - Body ground Power switch on (IG) Below 1 V

      Note

      Turning the power switch on (IG) with the hybrid vehicle 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 (Check for open)
      Tester Connection Switch Condition Specified Condition
      A76-22 (VCP1) - A36-4 (VCPA) Power switch off Below 1 Ω
      A76-19 (EP1) - A36-5 (EPA) Power switch off Below 1 Ω
      A76-23 (VCP2) - A36-1 (VCP2) Power switch off Below 1 Ω
      A76-18 (EP2) - A36-2 (EPA2) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      A76-22 (VCP1) or A36-4 (VCPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A76-19 (EP1) or A36-5 (EPA) - Body ground and other terminals Power switch off 10 kΩ or higher
      A76-23 (VCP2) or A36-1 (VCP2) - Body ground and other terminals Power switch off 10 kΩ or higher
      A76-18 (EP2) or A36-2 (EPA2) - Body ground and other terminals Power switch off 10 kΩ or higher

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR