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### DTC P2120/19 Throttle / Pedal Position Sensor / Switch "D" Circuit

### DTC P2122/19 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input

### DTC P2123/19 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input

### DTC P2125/19 Throttle / Pedal Position Sensor / Switch "E" Circuit

### DTC P2127/19 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input

### DTC P2128/19 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input

### DTC P2138/19 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

## for Preparation Click here

## DESCRIPTION

HINT:

1. This is the repair procedure for the accelerator pedal position sensor.
2. This electrical throttle system does not use a throttle cable.
3. This accelerator pedal position sensor is non-contact type.

The accelerator pedal position sensor is mounted on the accelerator pedal and detects the opening angle of the accelerator pedal. Since this sensor is electronically controlled with Hall-effect elements, accurate control and reliability can be obtained. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor.
In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA and VPA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. VPA is used to detect the actual accelerator pedal opening angle, which is used for the engine control. VPA2 is used to detect information about the opening angle, which is used for detecting malfunctions.
The ECM judges the current opening angle of the accelerator pedal using signals from terminals VPA and VPA2, and the ECM controls the throttle motor based on these signals.

DTC No. | DTC Detection Condition (All of following are 1 trip detection logic) | Trouble Area

P2120/19

Condition (a) continues for 0.5 sec. or more:
(a) VPA is 0.2 V or less or VPA is 4.8 V or more

1. Accelerator pedal position sensor
2. Accelerator pedal
3. Accelerator pedal rod (arm) deformed
4. ECM

P2122/19

VPA is 0.2 V or less for 0.5 sec. or more when VPA2 output indicates that accelerator pedal is opened

1. Accelerator pedal position sensor
2. Open in VCPA circuit
3. VPA circuit open or ground short
4. Accelerator pedal
5. Accelerator pedal rod (arm) deformed
6. ECM

P2123/19

Condition (a) continues for 2.0 sec. or more:
(a) VPA is 4.8 V or more

1. Accelerator pedal position sensor
2. Open in EPA circuit
3. Accelerator pedal
4. Accelerator pedal rod (arm) deformed
5. ECM

P2125/19

Condition (a) continues for 0.5 sec. or more:
(a) (VPA2 is 0.5 V or less) or (VPA2 is 4.8 V or more)

1. Accelerator pedal position sensor
2. Accelerator pedal
3. Accelerator pedal rod (arm) deformed
4. ECM

P2127/19

VPA2 is 0.5 V or less for 0.5 sec. or more when VPA output indicates that accelerator pedal is opened

1. Accelerator pedal position sensor
2. Open in VCP2 circuit
3. VPA2 circuit open or ground short
4. Accelerator pedal
5. Accelerator pedal rod (arm) deformed
6. ECM

P2128/19

Conditions (a) and (b) continue for 2.0 sec. or more:
(a) VPA2 is 4.8 V or more
(b) VPA is 0.2 V or more and VPA is 3.45 V or less

1. Accelerator pedal position sensor
2. Open in EPA2 circuit
3. Accelerator pedal
4. Accelerator pedal rod (arm) deformed
5. ECM

P2138/19

Condition (a) or (b) continues for 2.0 sec. or more:
(a) Difference between VPA and VPA2 is 0.02 V or less
(b) VPA is 0.2 V or less and VPA2 is 0.5 V or less

1. VPA and VPA2 circuit are short circuited
2. Accelerator pedal position sensor
3. Accelerator pedal
4. Accelerator pedal rod (arm) deformed
5. ECM

HINT:

  When DTC P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is detected, check the output voltage of the accelerator pedal position sensor by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Accel Position 1 and Accel Position 2.

- | Accelerator pedal position expressed as voltage output
- | Accelerator pedal released | Accelerator pedal depressed
Trouble Area | Accelerator Position No. 1 | Accelerator Position No. 2 | Accelerator Position No. 1 | Accelerator Position No. 2
VCP circuit open | 0 to 0.2 V | 0 to 0.2 V | 0 to 0.2 V | 0 to 0.2 V
VPA circuit open or ground short | 0 to 0.2 V | 1.4 to 1.8 V | 0 to 0.2 V | 3.7 to 5.0 V
VPA2 circuit open or ground short | 0.6 to 1.0 V | 0 to 0.2 V | 2.9 to 4.2 V | 0 to 0.2 V
EP circuit open | 4.5 to 5.0 V | 4.5 to 5.0 V | 4.5 to 5.0 V | 4.5 to 5.0 V

HINT:

  Accelerator pedal positions are expressed as voltages.

## WIRING DIAGRAM

## INSPECTION PROCEDURE

HINT:

  Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

NOTICE:

  If the ECM is replaced, the new ECM needs initialization (Click here).

## When using intelligent tester:

1.READ DATA LIST (ACCEL POSITION 1, ACCEL POSITION 2)

1. Connect the intelligent tester to the DLC3.

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

1. Enter the following menus: Powertrain / Engine / Data List / Accel Position 1 and Accel Position 2.

1. Read the values.

   Standard voltage:

     Accelerator Pedal | Accel Position 1 | Accel Position 2
     Released | 0.6 to 1.0 V | 1.4 to 1.8 V
     Depressed | 2.9 to 4.2 V | 3.7 to 5.0 V

| OK |

Go to step 5

NG |

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

1. Disconnect the A13 sensor connector.

1. Disconnect the E5 ECM connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition

     A13-1 (VCP2) - E5-27 (VCP2)
     A13-2 (EP2) - E5-29 (EPA2)
     A13-3 (VPA2) - E5-23 (VPA2)
     A13-4 (VCP1) - E5-26 (VCPA)
     A13-5 (EP1) - E5-28 (EPA)
     A13-6 (VPA1) - E5-22 (VPA)

     Below 1 Ω

     A13-1 (VCP2) or E5-27 (VCP2) - Body ground
     A13-2 (EP2) or E5-29 (EPA2) - Body ground
     A13-3 (VPA2) or E5-23 (VPA2) - Body ground
     A13-4 (VCP1) or E5-26 (VCPA) - Body ground
     A13-5 (EP1) or E5-28 (EPA) - Body ground
     A13-6 (VPA1) or E5-22 (VPA) - Body ground

     10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

3.CHECK ECM (VCPA, VCP2 VOLTAGE)

1. Disconnect the A13 sensor connector.

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Specified Condition
     E5-26 (VCPA) - E5-28 (EPA) E5-27 (VCP2) - E5-29 (EPA2) | 4.5 to 5.0 V

| NG |

REPLACE ECM

OK |

4.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

NEXT |

5.READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)

Click here

1. Clear the DTC (see page ).

1. Start the engine.

1. Drive the engine at idle for 15 seconds or more.

1. Read the DTC (Click here).

   Result:

     Display (DTC output) | Proceed to
     P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is output again | A
     P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is not output | B

| B |

SYSTEM OK

A |

REPLACE ECM

## When not using intelligent tester:

1.CHECK ECM (VPA, VPA2 VOLTAGE)

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Condition | Accelerator Pedal Condition | Specified Condition
     E5-22 (VPA) - E5-28 (EPA) | Released | 0.6 to 1.0 V
     E5-22 (VPA) - E5-28 (EPA) | Depressed | 2.9 to 4.2 V
     E5-23 (VPA2) - E5-29 (EPA2) | Released | 1.4 to 1.8 V
     E5-23 (VPA2) - E5-29 (EPA2) | Depressed | 3.7 to 5.0 V

| OK |

REPLACE ECM

NG |

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

1. Disconnect the A13 sensor connector.

1. Disconnect the E5 ECM connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition

     A13-1 (VCP2) - E5-27 (VCP2)
     A13-2 (EP2) - E5-29 (EPA2)
     A13-3 (VPA2) - E5-23 (VPA2)
     A13-4 (VCP1) - E5-26 (VCPA)
     A13-5 (EP1) - E5-28 (EPA)
     A13-6 (VPA1) - E5-22 (VPA)

     Below 1 Ω

     A13-1 (VCP2) or E5-27 (VCP2) - Body ground
     A13-2 (EP2) or E5-29 (EPA2) - Body ground
     A13-3 (VPA2) or E5-23 (VPA2) - Body ground
     A13-4 (VCP1) or E5-26 (VCPA) - Body ground
     A13-5 (EP1) or E5-28 (EPA) - Body ground
     A13-6 (VPA1) or E5-22 (VPA) - Body ground

     10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

3.CHECK ECM (VCPA, VCP2 VOLTAGE)

1. Disconnect the A13 sensor connector.

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Specified Condition
     E5-26 (VCPA) - E5-28 (EPA) E5-27 (VCP2) - E5-29 (EPA2) | 4.5 to 5.0 V

| NG |

REPLACE ECM

OK |

4.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

NEXT |

5.READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)

Click here

1. Clear the DTC (see page ).

1. Start the engine.

1. Drive the engine at idle for 15 seconds or more.

1. Read the DTC (Click here).

   Result:

     Display (DTC output) | Proceed to
     P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is output again | A
     P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is not output | B

| B |

SYSTEM OK

A |

REPLACE ECM