GSIC - Global Service Information Center

### 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 Electronic Throttle Control System (ETCS) does not use a throttle cable.
2. These DTCs are related to the accelerator pedal position sensor. The troubleshooting procedures for the accelerator pedal position sensor are in the flowchart below.

The Accelerator Pedal Position (APP) sensor is mounted in the accelerator pedal to detect the angle of the accelerator pedal. This sensor is electronically controlled and uses Hall-effect elements.
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the ECM changes between 0 V and 5 V in proportion to the angle of the accelerator pedal. VPA is a signal to indicate the actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of the sensor itself.
The ECM monitors the accelerator pedal angle from the VPA and VPA2 signal outputs, and controls the throttle motor based on these signals.

DTC No. | DTC Detection Condition | Suspected Area

P2120/19

VPA1 quickly fluctuates up and down beyond upper and lower malfunction thresholds for 0.5 seconds

1. Accelerator pedal position sensor
2. ECM

P2122/19

Condition (a) continues for 0.5 seconds or more when accelerator pedal is fully released:

1. (a) VPA1 is 0.2 V or less

1. Accelerator pedal position sensor
2. Open in VCP1 circuit
3. Open or ground short in VPA1 circuit
4. ECM

P2123/19

Condition (a) continues for 2.0 seconds or more:

1. (a) VPA1 is 4.8 V or more

1. Accelerator pedal position sensor
2. Open in EPA circuit
3. ECM

P2125/19

Condition (a) continues for 0.5 seconds or more:

1. (a) VPA2 quickly fluctuates up and down beyond upper and lower malfunction thresholds

1. Accelerator pedal position sensor
2. ECM

P2127/19

Condition (a) continues for 0.5 seconds or more when accelerator pedal is fully released:

1. (a) VPA2 is 0.5 V or less

1. Accelerator pedal position sensor
2. Open in VCP2 circuit
3. Open or ground short in VPA2 circuit
4. ECM

P2128/19

Conditions (a) and (b) continue for 2.0 seconds or more:

1. (a) VPA2 is 4.8 V or more
2. (b) VPA1 is 0.2 V or more and VPA1 is 3.45 V or less

1. Accelerator pedal position sensor
2. Open in EPA2 circuit
3. ECM

P2138/19

Condition (a) or (b) continues for 2.0 seconds or more:

1. (a) Difference between VPA1 and VPA2 is 0.02 V or less
2. (b) VPA1 is 0.2 V or less and VPA2 is 0.5 V or less

1. VPA and VPA2 circuits are short-circuited
2. Accelerator pedal position sensor
3. ECM

HINT:

  When one or more of DTCs P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 and P2138/19 are detected, check the output voltage of the accelerator pedal position sensor by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

Suspected Area | Accel Position No.1 When AP Released | Accel Position No.2 When AP Released | Accel Position No.1 When AP Depressed | Accel Position No.2 When AP Depressed
VCP circuit open | 0 to 0.2 V | 0 to 0.2 V | 0 to 0.2 V | 0 to 0.2 V
Open or ground short in VPA circuit | 0 to 0.2 V | 1.2 to 2.0 V | 0 to 0.2 V | 3.4 to 5.0 V
Open or ground short in VPA2 circuit | 0.5 to 1.1 V | 0 to 0.2 V | 2.6 to 4.5 V | 0 to 0.2 V
EPA 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:

1. The accelerator pedal position is expressed in terms of voltage.
2. AP stands for accelerator pedal.

## MONITOR DESCRIPTION

When either voltage output VPA1 or VPA2 deviates from the standard range, or the difference between the voltage outputs of the two sensors is less than the threshold, the ECM concludes that there is a defect in the APP sensor. The ECM illuminates the MIL and sets a DTC.
Example:
The voltage output of the VPA1 is below 0.2 V or exceeds 4.8 V.
This monitor runs for 2 seconds (the first 2 seconds of engine idle) after the engine is started (1 trip detection logic).

## FAIL-SAFE

The accelerator pedal position sensor has a main circuit and associated circuit. When one circuit is malfunctioning, the accelerator pedal position is calculated by the output of the other circuit. When both of the circuits are malfunctioning, it is interpreted that the accelerator pedal is released. As a result, the throttle valve is closed and the engine idles.

## WIRING DIAGRAM

## INSPECTION PROCEDURE

HINT:

  Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. 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.

## When using intelligent tester:

1.READ DATA LIST (ACCELERATOR POSITION NO. 1, ACCELERATOR POSITION NO. 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 and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

1. Read the values.

   Standard voltage:

     Accelerator Pedal | Accelerator Position No. 1 | Accelerator Position No. 2
     Released | 0.5 to 1.1 V | 1.2 to 2.0 V
     Depressed | 2.6 to 4.5 V | 3.4 to 5.0 V

| OK |

Go to step 6

NG |

2.CHECK ECM (VCPA, VCP2 VOLTAGE)

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Specified Condition
     E9-26 (VCPA) - E9-20 (EPA) | 4.5 to 5.0 V
     E9-27 (VCP2) - E9-21 (EPA2) | 4.5 to 5.0 V

| NG |

REPLACE ECM

OK |

3.CHECK ECM (VPA, VPA2 VOLTAGE)

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Accelerator Pedal Condition | Specified Condition
     E9-18 (VPA) - E9-20 (EPA) | Released | 0.5 to 1.1 V
     E9-18 (VPA) - E9-20 (EPA) | Depressed | 2.5 to 4.6 V
     E9-19 (VPA2) - E9-21 (EPA2) | Released | 1.5 to 2.9 V
     E9-19 (VPA2) - E9-21 (EPA2) | Depressed | 3.5 to 5.0 V

| OK |

REPLACE ECM

NG |

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

1. Disconnect the A13 accelerator pedal position sensor connector.

1. Disconnect the E9 ECM connector.

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

   Standard resistance:

     Tester Connection | Specified Condition
     A13-6 (VPA1) - E9-18 (VPA) | Below 1 Ω
     A13-5 (EP1) - E9-20 (EPA) | Below 1 Ω
     A13-4 (VCP1) - E9-26 (VCPA) | Below 1 Ω
     A13-3 (VPA2) - E9-19 (VPA2) | Below 1 Ω
     A13-2 (EP2) - E9-21 (EPA2) | Below 1 Ω
     A13-1 (VCP2) - E9-27 (VCP2) | Below 1 Ω
     A13-6 (VPA1) or E9-18 (VPA) - Body ground | 10 kΩ or higher
     A13-5 (EP1) or E9-20 (EPA) - Body ground | 10 kΩ or higher
     A13-4 (VCP1) or E9-26 (VCPA) - Body ground | 10 kΩ or higher
     A13-3 (VPA2) or E9-19 (VPA2) - Body ground | 10 kΩ or higher
     A13-2 (EP2) or E9-21 (EPA2) - Body ground | 10 kΩ or higher
     A13-1 (VCP2) or E9-27 (VCP2) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

5.REPLACE ACCELERATOR PEDAL ROD

NEXT |

6.CHECK IF DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)

1. Connect the intelligent tester to the DLC3.

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

1. Clear the DTCs (Click here).

1. Start the engine.

1. Idle the engine for 15 seconds or more.

1. Enter the following menus: Powertrain / Engine and ECT / DTC.

1. Read DTC (Click here).

Result:

  Display (DTC Output) | Proceed to
  One or more of P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 and P2138/19 | A
  No output | B

| B |

NORMAL

A |

REPLACE ECM

## When not using intelligent tester:

1.CHECK ECM (VCPA, VCP2 VOLTAGE)

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Specified Condition
     E9-26 (VCPA) - E9-20 (EPA) | 4.5 to 5.0 V
     E9-27 (VCP2) - E9-21 (EPA2) | 4.5 to 5.0 V

| NG |

REPLACE ECM

OK |

2.CHECK ECM (VPA, VPA2 VOLTAGE)

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Accelerator Pedal Condition | Specified Condition
     E9-18 (VPA) - E9-20 (EPA) | Released | 0.5 to 1.1 V
     E9-18 (VPA) - E9-20 (EPA) | Depressed | 2.5 to 4.6 V
     E9-19 (VPA2) - E9-21 (EPA2) | Released | 1.5 to 2.9 V
     E9-19 (VPA2) - E9-21 (EPA2) | Depressed | 3.5 to 5.0 V

| OK |

REPLACE ECM

NG |

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

1. Disconnect the A13 accelerator pedal position sensor connector.

1. Disconnect the E9 ECM connector.

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

   Standard resistance:

     Tester Connection | Specified Condition
     A13-6 (VPA1) - E9-18 (VPA) | Below 1 Ω
     A13-5 (EP1) - E9-20 (EPA) | Below 1 Ω
     A13-4 (VCP1) - E9-26 (VCPA) | Below 1 Ω
     A13-3 (VPA2) - E9-19 (VPA2) | Below 1 Ω
     A13-2 (EP2) - E9-21 (EPA2) | Below 1 Ω
     A13-1 (VCP2) - E9-27 (VCP2) | Below 1 Ω
     A13-6 (VPA1) or E9-18 (VPA) - Body ground | 10 kΩ or higher
     A13-5 (EP1) or E9-20 (EPA) - Body ground | 10 kΩ or higher
     A13-4 (VCP1) or E9-26 (VCPA) - Body ground | 10 kΩ or higher
     A13-3 (VPA2) or E9-19 (VPA2) - Body ground | 10 kΩ or higher
     A13-2 (EP2) or E9-21 (EPA2) - Body ground | 10 kΩ or higher
     A13-1 (VCP2) or E9-27 (VCP2) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

4.REPLACE ACCELERATOR PEDAL ROD

NEXT |

5.CHECK IF DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)

1. Clear the DTCs (Click here).

1. Start the engine.

1. Idle the engine for 15 seconds or more.

1. Read DTC (Click here).

Result:

  Display (DTC Output) | Proceed to
  One or more of P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 and P2138/19 | A
  No output | B

| B |

NORMAL

A |

REPLACE ECM