HYBRID CONTROL SYSTEM Kick Down Switch Circuit

DESCRIPTION

When the hybrid vehicle control ECU assembly receives a signal from the kick down switch assembly, it increases power output to enable more powerful driving. If the kick down switch circuit is open or the hybrid vehicle control ECU assembly recognizes the switch signal incorrectly, the power is limited to the same level as when the kick down switch is turned off.

WIRING DIAGRAM

PROCEDURE

1. READ VALUE USING GTS (KICK DOWN SWITCH STATUS)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Enter the following menus: Powertrain / Hybrid Control / Data List / Kick Down Switch Status.

      
      Powertrain > Hybrid Control > Data List

      Tester Display
      Kick Down Switch Status

   4. Read the value displayed on the GTS.

      
      Powertrain > Hybrid Control > Data List

      Tester Display	Measurement Item	Range	Normal Condition
      Kick Down Switch Status	Kick down switch signal	ON or OFF	Accelerator pedal is depressed all the way down: ON Accelerator pedal is released: OFF

      Result
      Result Proceed to The GTS display changes according to the accelerator pedal operation. A The GTS display does not change according to the accelerator pedal operation. B

   5. Turn the power switch off.

   
   

   A

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   B

2. CHECK CONNECTOR CONNECTION CONDITION (KICK DOWN SWITCH CONNECTOR)

   
   
   1. 

      *A	for LHD
      *B	for RHD

      Check the connector connections and contact pressure of the relevant terminals for the kick down switch assembly connector

      Click here

      OK
      The connectors are connected securely and there are no contact pressure problems.

      Result
      Proceed to OK NG

   
   

   NG

   CONNECT SECURELY

   OK

3. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY

   
   

   1. Disconnect the A53 kick down switch assembly connector.

   2. Turn the power switch on (IG).

   3. 

      *a	Front view of wire harness connector (to Kick Down Switch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition A53-2 (KD) - Body ground Power switch on (IG) 11 to 14 V

   4. Turn the power switch off.

   5. Reconnect the A53 kick down switch assembly connector.

      Result
      Proceed to OK NG

   
   

   NG

   CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - KICK DOWN SWITCH ASSEMBLY) Click here

   OK

4. INSPECT KICK DOWN SWITCH ASSEMBLY

   
   

   1. Remove the kick down switch assembly.

      for LHD: Click here

      for RHD: Click here

   2. 

      *a	Component without harness connected (Kick Down Switch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 (E) - 2 (KD) Kick down switch assembly pushed Below 1 Ω 1 (E) - 2 (KD) Kick down switch assembly not pushed 10 kΩ or higher

   3. Install the kick down switch assembly.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE KICK DOWN SWITCH ASSEMBLY for LHD: Click here REPLACE KICK DOWN SWITCH ASSEMBLY for RHD: Click here

   OK

5. CHECK HARNESS AND CONNECTOR (KICK DOWN SWITCH ASSEMBLY - BODY GROUND)

   
   

   1. Disconnect the A53 kick down switch assembly connector.

   2. 

      *a	Front view of wire harness connector (to Kick Down Switch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition A53-1 (E) - A53-2 (KD) Power switch off Below 1 Ω

   3. Reconnect the A53 kick down switch assembly connector.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - KICK DOWN SWITCH ASSEMBLY)

   
   

   1. Disconnect the O141 hybrid vehicle control ECU assembly connector.

   2. Disconnect the A53 kick down switch assembly connector.

   3. 

      *a	Rear view of wire harness connector (to Hybrid Vehicle Control ECU Assembly)
      *b	Front view of wire harness connector (to Kick Down Switch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition O141-13 (KD) - A53-2 (KD) Power switch off Below 1 Ω O141-13 (KD) or A53-2 (KD) - Body ground Power switch off 10 kΩ or higher

   4. Reconnect the A53 kick down switch assembly connector.

   5. Reconnect the O141 hybrid vehicle control ECU assembly connector.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR