P2120

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2120-152-P2123-105,P2125-153-P2128-108,P2138-110,P2138-154: Throttle / Pedal Position Sensor / Switch "D" Circuit


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.









WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (ACCEL PEDAL POS #1, ACCEL PEDAL POS #2)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

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

(d) Read the data list.





Result:





HINT
- 5 V is indicated as 100% on the Techstream.
- The voltage changes when kickdown occurs.

NG -- CHECK CONNECTOR CONNECTION CONDITION (ACCELERATOR PEDAL SENSOR ASSEMBLY CONNECTOR)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems

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

(a) Check the connection of the accelerator pedal sensor assembly connector.





OK:

The connector is connected securely and there are no contact problems.

NG -- CONNECT SECURELY
OK -- Continue to next step.

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

(a) 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 -- Continue to next step.

4. CHECK HYBRID VEHICLE CONTROL ECU (CHECK VOLTAGE)

(a) Turn the power switch off.

(b) Disconnect the accelerator pedal sensor assembly connector.





(c) Turn the power switch on (IG).

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





Standard voltage:





NG -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ACCELERATOR PEDAL SENSOR ASSEMBLY)
OK -- Continue to next step.

5. CHECK HYBRID VEHICLE CONTROL ECU (CHECK RESISTANCE)

(a) Turn the power switch off.





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

Standard resistance:





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

OK -- REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Components

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

(a) Turn the power switch off.

(b) Disconnect connector A74 from the hybrid vehicle control ECU.





(c) Turn the power switch on (IG).

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

Standard voltage:





NOTICE:
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.

(e) Turn the power switch off.

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

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

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

(a) Turn the power switch off.

(b) Disconnect connector A74 from the hybrid vehicle control ECU.





(c) Turn the power switch on (IG).

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

Standard voltage:





NOTICE:
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.

(e) Turn the power switch off.

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

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components