Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
READ VALUE USING INTELLIGENT TESTER (ACCEL SENSOR OUT NO.1 AND ACCEL SENSOR OUT NO.2)
CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL ROD ASSEMBLY - ECM)
INSPECT ECM (VCPA AND VCP2 VOLTAGE)
REPLACE ACCELERATOR PEDAL ROD ASSEMBLY
CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL SENSOR DTCS)
DTC P2120 Throttle / Pedal Position Sensor / Switch "D" Circuit |
DTC P2122 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input |
DTC P2123 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input |
DTC P2125 Throttle / Pedal Position Sensor / Switch "E" Circuit |
DTC P2127 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input |
DTC P2128 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input |
DTC P2138 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation |
- HINT:
- These DTCs relate to the accelerator pedal sensor.
- This electronic throttle control system does not use a throttle cable.
DESCRIPTION
The accelerator pedal sensor is mounted on the accelerator pedal bracket and has 2 sensor circuits: VPA (main) and VPA2 (sub). This sensor is a non-contact type. It uses Hall-effect elements in order to yield accurate signals, even in extreme driving conditions, such as at high speeds as well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the ECM, varies between 0 V and 5 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal position (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal sensor itself.The ECM monitors the actual accelerator pedal position (throttle valve opening angle) through the signals from VPA and VPA2, and controls the throttle actuator according to these signals.
| DTC No. | DTC Detection Condition | Trouble Area |
| P2120 | VPA fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1-trip detection logic). |
|
| P2122 | VPA is 0.4 V or less for 0.5 seconds or more when the accelerator pedal is fully released (1-trip detection logic). |
|
| P2123 | VPA is 4.8 V or higher for 2.0 seconds or more (1-trip detection logic). |
|
| P2125 | VPA2 fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1-trip detection logic). |
|
| P2127 | VPA2 is 1.2 V or less for 0.5 seconds or more when the accelerator pedal is fully released (1-trip detection logic). |
|
| P2128 | Conditions (a) and (b) are met for 2.0 seconds or more (1-trip detection logic): (a) VPA2 is 4.8 V or higher. (b) VPA is between 0.4 V and 3.45 V. |
|
| P2138 | Condition (a) or (b) is met for 2.0 seconds or more (1-trip detection logic): (a) The difference between VPA and VPA2 is 0.02 V or less. (b) VPA is 0.4 V or less and VPA2 is 1.2 V or less. |
|
- HINT:
- When any of these DTCs are output, check the accelerator pedal position sensor voltage using the intelligent tester. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No.1 and Accel Sensor Out No.2.
| Trouble Area | Accel Sensor Out No.1 When Accelerator Pedal Released | Accel Sensor Out No.2 When Accelerator Pedal Released | Accel Sensor Out No.1 When Accelerator Pedal Depressed | Accel Sensor Out No.2 When Accelerator Pedal Depressed |
| VCPA or VCP2 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 4.98 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 or EPA2 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 |
| Normal condition | 0.5 to 1.1 V | 1.2 to 2.0 V | 2.6 to 4.5 V | 3.4 to 4.98 V |
- HINT:
- Accelerator pedal positions are expressed as voltages.
FAIL-SAFE
When DTC P2120, P2122, P2123, P2125, P2127, P2128 or P2138 is stored, the ECM enters fail-safe mode. If either of the 2 sensor circuits malfunctions, the ECM uses the remaining circuit to calculate the accelerator pedal position to allow the vehicle to continue to be driven. If both of the circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles. The ECM continues operating in fail-safe mode until a pass condition is detected and the ignition switch is turned off.WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition 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.
| 1.READ VALUE USING INTELLIGENT TESTER (ACCEL SENSOR OUT NO.1 AND ACCEL SENSOR OUT NO.2) |
Connect the intelligent tester to the DLC3.
 |
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No.1 and Accel Sensor Out No.2.
Read the value displayed on the tester.
- Standard Voltage:
Accelerator Pedal Operation Accel Sensor Out No.1 Accel Sensor Out No.2 Difference between Accel Sensor Out No. 1 and Accel Sensor Out No. 2 Released 0.5 to 1.1 V 1.2 to 2.0 V More than 0.02 V Depressed 2.6 to 4.5 V 3.4 to 4.98 V
|
| ||||
| OK | ||
| ||
| 2.CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL ROD ASSEMBLY - ECM) |
Disconnect the accelerator pedal rod assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition G6-6 (VPA) - G146-6 (VPA) Always Below 1 Ω G6-5 (EP1) - G146-2 (EPA) Always Below 1 Ω G6-4 (VCPA) - G146-4 (VCPA) Always Below 1 Ω G6-3 (VPA2) - G146-5 (VPA2) Always Below 1 Ω G6-2 (EPA2) - G146-1 (EPA2) Always Below 1 Ω G6-1 (VCP2) - G146-3 (VCP2) Always Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition G6-6 (VPA) or G146-6 (VPA) - Body ground Always 10 kΩ or higher G6-5 (EPA) or G146-2 (EPA) - Body ground Always 10 kΩ or higher G6-4 (VCPA) or - G146-4 (VCPA) - Body ground Always 10 kΩ or higher G6-3 (VPA2) or G146-5 (VPA2) - Body ground Always 10 kΩ or higher G6-2 (EPA2) or G146-1 (EPA2) - Body ground Always 10 kΩ or higher G6-1 (VCP2) or G146-3 (VCP2) - Body ground Always 10 kΩ or higher
Reconnect the accelerator pedal rod assembly connector.
Reconnect the ECM connector.
|
| ||||
| OK | |
| 3.INSPECT ECM (VCPA AND VCP2 VOLTAGE) |
Disconnect the accelerator pedal rod assembly connector.
 |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Switch Condition Specified Condition G6-4 (VCPA) - G6-5 (EPA) Ignition switch ON 4.5 to 5.5 V G6-1 (VCP2) - G6-2 (EPA2) Ignition switch ON 4.5 to 5.5 V
Text in Illustration *a Front view of wire harness connector
(to accelerator pedal rod assembly)
Reconnect the accelerator pedal rod assembly connector.
|
| ||||
| OK | |
| 4.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY |
Replace the accelerator pedal rod assembly (HILUX_TGN26 RM000000VWD01YX.html).
| NEXT | |
| 5.CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL SENSOR DTCS) |
Connect the intelligent tester to the DLC3.
Turn the Ignition switch to ON.
Turn the tester on.
Clear the DTCs (HILUX_TGN26 RM000000PDK12LX.html).
Start the engine.
Allow the engine to idle for 15 seconds.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Result Result Proceed to DTC P2120, P2122, P2123, P2125, P2127, P2128, and/or P2138 is output A DTC is not output B
|
| ||||
| A | ||
| ||