CRUISE CONTROL SYSTEM(for 8NR-FTS) Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch is used to turn the cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP and CANCEL. The SET, TAP-DOWN and - (COAST) functions, and the RES (RESUME), TAP-UP and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact points of the cruise control main switch turn on with switch operation. Then the ECM reads the voltage value that has been changed by the switch operation to control the SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL functions.

WIRING DIAGRAM

A01TDRXE05

CAUTION / NOTICE / HINT

Note

Before replacing the ECM, refer to Service Bulletin.

PROCEDURE


  1. READ VALUE ON GTS


    1. A01TD6KC01
      *a ON-OFF
      *b -/SET
      *c +/RES
      *d CANCEL

      Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Cruise Control / Data List.

    5. Check the Data List to confirm proper functioning of the cruise control main switch.


      Powertrain > Cruise Control > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Cancel Switch CANCEL switch signal ON or OFF

      ON: CANCEL switch on

      OFF: CANCEL switch off

      		 -
      -SET Switch -/SET switch signal ON or OFF

      ON: -/SET switch on

      OFF: -/SET switch off

      		 -
      +RES Switch +/RES switch signal ON or OFF

      ON: +/RES switch on

      OFF: +/RES switch off

      		 -
      Cruise Ready Main-CPU Cruise control system standby condition (Main-CPU) ON or OFF

      ON: Cruise control main switch (Main-CPU) SET

      OFF: Cruise control main switch (Main-CPU) UNSET

      		 -

      Powertrain > Cruise Control > Data List
      Tester Display
      Cancel Switch
      -SET Switch
      +RES Switch
      Cruise Ready Main-CPU
      OK
      When the cruise control main switch is operated, the display changes as shown above.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT CRUISE CONTROL MAIN SWITCH


    1. Inspect the cruise control main switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CRUISE CONTROL MAIN SWITCH Click here

    OK

  3. CHECK CRUISE CONTROL SWITCH WIRE


    1. A01TA1GC43
      *a

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly)
      *b

      Front view of wire harness connector

      (to Cruise Control Main Switch)

      Remove the cruise control switch wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z4-3 (CCS) - A-3 Always Below 1 Ω
      z4-4 (ECC) - A-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CRUISE CONTROL SWITCH WIRE Click here

    OK

  4. INSPECT SPIRAL CABLE SUB-ASSEMBLY


    1. Inspect the spiral cable sub-assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM)


    1. Disconnect the A173 ECM connector.

    2. Disconnect the E6 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A173-55 (CCS) - E6-1 (CCS) Always Below 1 Ω
      A173-41 (ECCS) - E6-2 (ECC) Always Below 1 Ω
      A173-55 (CCS) or E6-1 (CCS) - Body ground Always 10 kΩ or higher
      A173-41 (ECCS) or E6-2 (ECC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM)

    OK

  6. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)


    1. Disconnect the B208 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B208-53 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)