AUTOMATIC TRANSMISSION SYSTEM ECU Power Source Circuit

DESCRIPTION

When the ignition switch is turned to ON, battery voltage is applied to terminal IG2 of the TCM.

WIRING DIAGRAM

A01LF42E01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)


    1. A01LG7WC14
      *a

      Rear view of wire harness connector

      (to TCM)

      Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C77-1 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK TCM (TCM - BATTERY)


    1. A01L9MJC33
      *a

      Rear view of wire harness connector

      (to TCM)

      Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G90-6 (IG2) - C77-1 (E1) Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (w/o Entry and Start System) B
      NG (w/ Entry and Start System) C

    A

    REPLACE TCM Click here

    C

    INSPECT IG2 RELAY Click here

    B

  3. INSPECT IGNITION SWITCH ASSEMBLY


    1. Inspect the ignition switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY, IGNITION SWITCH ASSEMBLY - TCM)

    NG

    REPLACE IGNITION SWITCH ASSEMBLY Click here

  4. INSPECT IG2 RELAY


    1. Inspect the IG2 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IG2 RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 4 INSTRUMENT PANEL RELAY BLOCK ASSEMBLY - TCM)


    1. Remove the IG2 relay from the No. 4 instrument panel relay block assembly.

    2. Disconnect the G90 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IG2 relay terminal 3 - G90-6 (IG2) Always Below 1 Ω
      IG2 relay terminal 3 or G90-6 (IG2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK TERMINAL VOLTAGE (IG2 RELAY)


    1. Remove the IG2 relay from the No. 4 instrument panel relay block assembly.

      A01LC8FC02
      *A for RHD *B for LHD
      *1 No. 4 Instrument Panel Relay Block Assembly - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      IG2 relay terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - NO. 4 INSTRUMENT PANEL RELAY BLOCK ASSEMBLY)

    OK

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - NO. 4 INSTRUMENT PANEL RELAY BLOCK ASSEMBLY - BODY GROUND)


    1. Disconnect the G69 certification ECU (smart key ECU assembly) connector.

    2. Remove the IG2 relay from the No. 4 instrument panel relay block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G69-20 (IG1D) - IG2 Relay terminal 1 Always Below 1 Ω
      IG2 Relay terminal 2 - Body ground Always Below 1 Ω
      G69-20 (IG1D) or IG2 Relay terminal 1 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR