P2128

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2122-104: Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input

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

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

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

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

DESCRIPTION
HINT:
- This is the repair procedure for the accelerator pedal position sensor.
- This electrical throttle system does not use a throttle cable.
- This accelerator pedal position sensor is a non-contact type.

The accelerator pedal position sensor is mounted on the accelerator pedal to detect how much it is depressed. It has 2 sensor terminals (VPA and VPA2) to detect the accelerator pedal position and a malfunction of the accelerator pedal position sensor itself. Since this sensor is electronically controlled with hall elements, accurate control and reliability can be obtained.
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the HV control ECU changes between 0 V and 5 V in proportion to the degree of depressing the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal position angle which is used for the HV system control, and the VPA2 is a signal to indicate the actual accelerator pedal position angle which is used for detecting a malfunction of the sensor itself (terminal VPA).
The HV control ECU judges how much the accelerator pedal is being depressed from the VPA and VPA2 signals, and controls the HV system based on the signals.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING THE TECHSTREAM (ACCEL PEDAL POS #1 AND ACCEL PEDAL POS #2)

(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Enter the following menus: Powertrain / Engine Control / Data List.
(d) Read the "Accel Pedal Pos #1" and "Accel Pedal Pos #2" values on the Techstream with the engine stopped.
OK:
Changes with accelerator pedal pressure
OK -- CHECK IF DTC OUTPUT RECURS (DTC P2122, P2123, P2127 OR P2128)
NG -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ACCELERATOR PEDAL POSITION SENSOR)

(a) Disconnect the H16 HV control ECU connector.

(b) Disconnect the A13 accelerator pedal position sensor connector.
(c) Turn the power switch ON (IG).
(d) Measure the voltage between the terminals of the HV control ECU connector and body ground.
Standard voltage:

(e) Turn the power switch OFF.
(f) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):

Standard resistance (Check for short)

(g) Reconnect the accelerator pedal position sensor connector.
(h) Reconnect the HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT HYBRID VEHICLE CONTROL ECU (VCP1 OR VCP2 VOLTAGE)

(a) Disconnect the A13 accelerator pedal position sensor connector.
(b) Turn the power switch ON (IG).

(d) Reconnect the accelerator pedal position sensor connector.
NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- Continue to next step.

4. REPLACE ACCELERATOR PEDAL ROD
(a) Replace the Accelerator pedal rod Removal.
NEXT -- Continue to next step.

5. CHECK IF DTC OUTPUT RECURS (DTC P2122, P2123, P2127 OR P2128)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Perform a simulation test.
(e) Check if DTCs are output.
Result:
DTC P2122, P2123, P2127 or P2128 is not output again
YES -- SYSTEM IS OK
NO -- REPLACE HYBRID VEHICLE CONTROL ECU