ECD SYSTEM(for Swirl Control Valve) 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

A321043E07

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.

      Table 1. Result

      Result

      Proceed to

      Engine cannot be cranked

      A

      Engine can be cranked

      B

    READ VALUE USING GTS (STARTER SIGNAL)Click here

  2. INSPECT STARTER RELAY (ST)

    1. Inspect the starter relay (Click here).

    REPLACE STARTER RELAY (ST)

  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.

    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

    READ VALUE USING GTS (STARTER SIGNAL)Click here

  4. CHECK HARNESS AND CONNECTOR (ST RELAY HOLDER TERMINAL VOLTAGE)

    1. A318266E06

      Remove the ST relay from the No. 3 relay 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
      Table 2. Text in Illustration

      *1

      No. 3 Relay Block

      *2

      ST Relay Holder
      Table 3. Result

      Result

      Proceed to

      Normal

      A

      Abnormal (ST relay holder terminal 1)

      B

      Abnormal (ST relay holder terminal 5)

      C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - ST RELAY HOLDER)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST RELAY HOLDER)

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

    1. A318266E07

      Remove the ST relay from the No. 3 relay 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
      Table 4. Text in Illustration

      *1

      No. 3 Relay Block

      *2

      ST Relay Holder

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. Remove the ST relay from the No. 3 relay 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

      C92-1 - 3 (ST relay holder)

      Always

      Below 1 Ω

      C92-1 or 3 (ST relay holder) - Body ground

      Always

      10 kΩ or higher

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. READ VALUE USING GTS (STARTER SIGNAL)

    1. Disconnect the power management control 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.

    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
      Table 5. Result

      Result

      Proceed to

      OK (for LHD)

      A

      OK (for RHD)

      B

      NG

      C

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)

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

    1. U121929E02

      Disconnect the clutch start switch assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A4-2 - Body ground

      Cranking

      11 to 14 V
      Table 6. Text in Illustration

      *a

      Front view of wire harness connector

      (to Clutch Start Switch Assembly)

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

  9. INSPECT CLUTCH START SWITCH ASSEMBLY

    1. Inspect the clutch start switch assembly (Click here).

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - ST RELAY HOLDER)

    REPLACE CLUTCH START SWITCH ASSEMBLY

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

    1. U121930E01

      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

      H6-7 (AM2) - Body ground

      Always

      11 to 14 V
      Table 7. Text in Illustration

      *a

      Front view of wire harness connector

      (to Ignition Switch Assembly)

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

  11. INSPECT IGNITION SWITCH ASSEMBLY

    1. Inspect the ignition switch assembly (Click here).

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

    REPLACE IGNITION SWITCH ASSEMBLY

    (Click here)

  12. 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.

    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

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

  13. CHECK HARNESS AND CONNECTOR (ECM - ST RELAY HOLDER)

    U122245E02

    1. Disconnect the ECM connector.

    2. Disconnect the power management control ECU connector.

    3. Disconnect the clutch start switch assembly connector.

    4. Remove the ST relay from the No. 3 relay block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A76-36 (STA) - 2 (ST relay holder)

      Always

      Below 1 Ω
      Table 8. Text in Illustration

      *1

      No. 3 Relay Block

      *2

      ST Relay Holder

      *a

      Front view of wire harness connector

      (to ECM)

      -

      -

    REPLACE ECM

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR