ECD SYSTEM(w/ Glow Plug Controller) 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 pedal switch assembly and also flows to terminal STA of the ECM (STA Signal).

WIRING DIAGRAM

A357787E01

CAUTION / NOTICE / HINT

Note:

  • When replacing the ECM, perform ECM Initialization and Registration.

    Click here

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

Tip:

When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures 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 RELAY (ST NO. 1 RELAY)

    1. Inspect the ST NO. 1 relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE RELAY (ST NO. 1 RELAY)

    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

      Result

      Proceed to

      OK

      A

      NG (w/ stop and start system)

      B

      NG (w/o stop and start system)

      C
    B

    READ VALUE USING GTS (STARTER SIGNAL)Click here

    C

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF CLUTCH PEDAL SWITCH ASSEMBLY)Click here

    A

  4. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST NO. 1 RELAY)

    1. A365945C01

      *1

      Engine Room Relay Block and Junction Block Assembly

      *2

      ST NO. 1 Relay

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

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      ST NO. 1 relay terminal 2 - Body ground

      Cranking

      11 to 14 V

      ST NO. 1 relay terminal 5 - Body ground

      Always

      11 to 14 V

      Result

      Result

      Proceed to

      Normal

      A

      Abnormal (Starter relay terminal 2)

      B

      Abnormal (Starter relay terminal 5)

      C
    B

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

    C

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

    A

  5. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - BODY GROUND)

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      ST NO. 1 relay terminal 1 - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - STARTER ASSEMBLY)

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

    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

      ST NO. 1 relay terminal 3 - B8-1

      Always

      Below 1 Ω

      ST NO. 1 relay terminal 3 or B8-1 - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT STARTER ASSEMBLY

    1. Inspect the starter assembly.

      w/ stop and start system:Click here

      w/o stop and start system:Click here

      Result

      Proceed to

      OK

      NG
    OK

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

    NG

    REPLACE STARTER ASSEMBLY

    w/ stop and start system:Click here

    w/o stop and start system:Click here

  8. READ VALUE USING GTS (STARTER SIGNAL)

    1. Disconnect the engine stop and start ECU connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Starter Signal

    6. 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

    GO TO STOP AND START SYSTEM

    Click here

    NG

  9. CHECK TERMINAL VOLTAGE (POWER SOURCE OF CLUTCH PEDAL SWITCH ASSEMBLY)

    1. A257647C02

      *a

      Front view of wire harness connector

      (to Clutch Pedal Switch Assembly)

      Disconnect the clutch pedal switch assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A5-2 - Body ground

      Cranking

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION SWITCH ASSEMBLY)Click here

    OK

  10. INSPECT CLUTCH PEDAL SWITCH ASSEMBLY

    1. Inspect the clutch pedal switch assembly.

      Click here

      Result

      Result

      Proceed to

      OK (w/ stop and start system)

      A

      OK (w/o stop and start system)

      B

      NG

      C
    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CLUTCH PEDAL SWITCH ASSEMBLY - ENGINE STOP AND START CONTROL ECU - ST NO. 1 RELAY)

    B

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

    C

    REPLACE CLUTCH PEDAL SWITCH ASSEMBLY

    Click here

  11. 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 - ST NO. 1 RELAY)Click here

  12. CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION SWITCH ASSEMBLY)

    1. A257670C02

      *a

      Front view of wire harness connector

      (to Ignition Switch Assembly)

      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

      E4-4 (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

  13. INSPECT IGNITION SWITCH ASSEMBLY

    1. Inspect the ignition switch assembly.

      Click here

      Result

      Result

      Proceed to

      NG

      A

      OK (w/ stop and start system)

      B

      OK (w/o stop and start system)

      C
    A

    REPLACE IGNITION SWITCH ASSEMBLY

    Click here

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH ASSEMBLY - ENGINE STOP AND START ECU - CLUTCH PEDAL SWITCH ASSEMBLY)

    C

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

  14. CHECK HARNESS AND CONNECTOR (ECM - ST NO. 1 RELAY)

    1. Disconnect the ECM connector.

    2. Disconnect the engine stop and start ECU connector (w/ stop and start system).

    3. Disconnect the clutch pedal switch assembly connector.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A169-53 (STA) - ST NO. 1 relay terminal 2

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR