MULTI-MODE MANUAL TRANSAXLE SYSTEM Starter Signal Circuit

DTC Code DTC Name
Starter Signal Circuit

DESCRIPTION

  • Engine starting control (w/ Entry and Start System)

  • In this vehicle, the ST (starter) relay that supplies power to the starter motor is operated by the cranking holding function of the certification ECU. When the appropriate vehicle conditions are satisfied, the brake pedal is depressed and the transaxle gear is in neutral, the engine can be cranked.

    If the brake pedal is not depressed or the transaxle gear is not in neutral, the engine cannot be cranked.

    During cranking, the ST (starter) relay operation signal (STA signal) is input into the STA terminal of the TCM, and is used to control the multi-mode manual transaxle system.

  1. Engine starting control (w/o Entry and Start System)

  2. When the ignition switch is turned to ON and the brake pedal is depressed, the TCM turns on the shift lock solenoid in order to release shift lock.

  3. When the shift lever is in N, the TCM detects that the shift lever is in N using the shift position sensor.

  4. When the engine is started, the start signal is sent to the TCM through the neutral position switch. When the TCM receives this signal, the ST (starter) relay is turned on to cause the engine start.

WIRING DIAGRAM

Refer to DTC P0617.

Click here

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. READ VALUE USING GTS (STA SWITCH SIGNAL)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Multi-Mode M/T / Data List / STA Switch Signal.

    5. Read the Data List according to the display on the GTS.

      Powertrain > Multi-Mode M/T > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      STA Switch Signal

      STA signal

      OFF or ON

      ON: Cranking

      -

      Powertrain > Multi-Mode M/T > Data List

      Tester Display

      STA Switch Signal

    OK

    ON is displayed in the Data List when cranking.

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

  2. CHECK ST RELAY (POWER SOURCE)

    1. C303803C02

      *1

      NO. 1 Engine Room Relay Block

      *2

      ST Relay (Starter Relay)

      Remove the ST relay from the No. 1 engine room relay block.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 2 - Body ground

      Cranking

      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
    B

    CHECK HARNESS AND CONNECTOR (ST RELAY - TCM)Click here

    C

    CHECK HARNESS AND CONNECTOR (ST RELAY - NEUTRAL POSITION SWITCH)Click here

    A

  3. INSPECT ST RELAY (STARTER RELAY)

    1. Inspect the ST relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ST RELAY (STARTER RELAY)

    OK

  4. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 1 - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - TCM)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (ST RELAY - TCM)

    1. Disconnect the TCM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 2 - A27-4 (STRL)

      Always

      Below 1 Ω

      ST relay terminal 2 - A27-6 (STA)

      Always

      Below 1 Ω

      ST relay terminal 2 - Body ground

      Always

      10 kΩ or higher

      A27-6 (STA) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK TCM (TMN VOLTAGE)

    1. C239993C06

      *a

      Front view of wire harness connector

      (to TCM)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A27-3 (TMN) - Body ground

      Engine cranking

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE TCM

    1. Replace the TCM.

      Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (TCM - NEUTRAL POSITION SWITCH)

    1. Disconnect the neutral position switch connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A27-3 (TMN) - A44-1 (TME)

      Always

      Below 1 Ω

      A27-3 (TMN) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT NEUTRAL POSITION SWITCH

    1. Inspect the neutral position switch.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE NEUTRAL POSITION SWITCH

    Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - NEUTRAL POSITION SWITCH)

    1. Disconnect the neutral position switch connector.

    2. Disconnect the ignition or starter switch assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E21-7 (ST2) - A44-2 (TMN)

      Always

      Below 1 Ω

      E21-7 (ST2) or A44-2 (TMN) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

    1. Inspect the ignition or starter switch assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

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

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

    Click here

  11. CHECK HARNESS AND CONNECTOR (ST RELAY - NEUTRAL POSITION SWITCH)

    1. Disconnect the neutral position switch assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 2 - A44-1 (TME)

      Always

      Below 1 Ω

      ST relay terminal 2 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (ST RELAY - TCM)

    1. Disconnect the TCM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 2 - A27-6 (STA)

      Always

      Below 1 Ω

      ST relay terminal 2 - Body ground

      Always

      10 kΩ or higher

      A27-6 (STA) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (ST RELAY - CERTIFICATION ECU)

    1. Disconnect the certification ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 2 - E50-37 (STA)

      Always

      Below 1 Ω

      ST relay terminal 2 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. INSPECT NEUTRAL POSITION SWITCH

    1. Inspect the neutral position switch.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE NEUTRAL POSITION SWITCH

    Click here

    OK

  15. CHECK HARNESS AND CONNECTOR (NEUTRAL POSITION SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A44-2 (TMN) - E49-5 (STAR)

      Always

      Below 1 Ω

      A44-2 (TMN) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ENTRY AND START SYSTEM

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR