ECD SYSTEM Starter Signal Circuit

DTC Code DTC Name
Starter Signal Circuit

DESCRIPTION

w/o Entry and Start System:

While the engine is being cranked, current flows from terminal ST2 of the ignition switch assembly to the clutch start switch assembly and also flows to terminal STA of the ECM (STA Signal).

WIRING DIAGRAM

Refer to DTC P0617.

Click here

CAUTION / NOTICE / HINT

Note:

  • When replacing the ECM, the ECM needs registration and initialization.

    Click here

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

Tip:

When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

PROCEDURE

  1. CHECK WHETHER ENGINE CAN BE CRANKED

    1. Check if the engine can be cranked.

      Result

      Result

      Proceed to

      Engine cannot be cranked

      A

      Engine can be cranked

      B
    B

    READ VALUE USING GTS (STARTER SIGNAL)Click here

    A

  2. INSPECT STARTER RELAY (ST)

    1. Inspect the starter relay (ST).

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE STARTER RELAY (ST)

    OK

  3. READ VALUE USING GTS (STARTER 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 / Engine and ECT / Data List / Starter Signal.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK

      Ignition Switch Position

      Starter Signal

      ON

      OFF

      START

      ON

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH TERMINAL VOLTAGE)Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY HOLDER TERMINAL VOLTAGE)

    A296486C05

    *1

    Engine Room Relay Block and Junction Block

    *2

    ST Relay

    1. Remove the ST NO. 1 relay from the engine room relay block and junction block.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      2 (ST relay holder) - Body ground

      Cranking

      11 to 14 V

      5 (ST relay holder) - Body ground

      Always

      11 to 14 V

    Result

    Result

    Proceed to

    OK

    A

    NG (ST relay holder terminal 1)

    B

    NG (ST relay holder terminal 5)

    C
    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - ST NO. 1 RELAY HOLDER)

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST NO. 1 RELAY HOLDER)

    A

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

    1. Remove the starter relay (ST) from the engine room relay block and junction block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (ST relay holder) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - STARTER RELAY (ST))

    1. Remove the starter relay (ST) from the engine room relay block and junction block.

    2. Disconnect the starter assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B117-1 - 3 (Starter relay (ST) holder)

      Always

      Below 1 Ω

      B117-1 or 3 (Starter relay (ST) holder) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH TERMINAL VOLTAGE)

    A257647C09

    *a

    Front view of wire harness connector

    (to Clutch Start Switch Assembly)

    *1

    for LHD

    *2

    for RHD

    1. Disconnect the clutch start switch assembly connector.

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

      Standard Voltage

      Table 1. for LHD

      Tester Connection

      Condition

      Specified Condition

      A4-2 - Body ground

      Cranking

      11 to 14 V
      Table 2. for RHD

      Tester Connection

      Condition

      Specified Condition

      F2-2 - Body ground

      Cranking

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (IGNITION SWITCH TERMINAL VOLTAGE)Click here

    OK

  8. INSPECT CLUTCH START SWITCH ASSEMBLY

    1. Inspect the clutch start switch assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY - ST NO. 1 RELAY HOLDER)

    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY

    Click here

  9. READ VALUE USING GTS (STARTER 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 / Engine and ECT / Data List / Starter Signal.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK

      Ignition Switch Position

      Starter Signal

      ON

      OFF

      START

      ON

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    CHECK HARNESS AND CONNECTOR (ECM - STARTER RELAY (ST))Click here

  10. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH TERMINAL VOLTAGE)

    A257670C05

    *a

    Front view of wire harness connector

    (to Ignition Switch Assembly)

    1. Disconnect the ignition switch assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G4-4 (AM2) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  11. INSPECT IGNITION SWITCH ASSEMBLY

    1. Inspect the ignition switch assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY)

    NG

    REPLACE IGNITION SWITCH ASSEMBLY

    Click here

  12. CHECK HARNESS AND CONNECTOR (ECM - STARTER RELAY (ST))

    1. Disconnect the ECM connector.

    2. Disconnect the clutch start switch assembly connector.

    3. Remove the starter relay (ST) from the engine room relay block and junction block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A62-36 (STA) - 2 (Starter relay (ST) holder)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR