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SFI SYSTEM Starter Signal Circuit

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DTC Code DTC Name
  Starter Signal Circuit
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DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition switch assembly to the park/neutral position switch assembly and also flows to terminal STA of the ECM (STA Signal).

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WIRING DIAGRAM

Refer to DTC P0617 (Click here).

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INSPECTION PROCEDURE

Note:

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

Tip:

This diagnosis procedure is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to Problem Symptoms Table (Click here).

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

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

    5. Read the value displayed on the tester when the ignition switch is turned to ON and engine cranking position.

      OK
      Ignition Switch Position Starter Signal
      Ignition switch on (IG) Close (starter signal off)
      Engine cranking position Open (starter signal on)

  2. Click here

    CHECK ST RELAY (POWER SOURCE)


    1. A017EV2E04

      Remove the ST relay from the engine room relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      ST relay terminal 2 - Body ground Engine cranking position 11 to 14 V
      Table 1. Text in Illustration
      *1 Engine Room Relay Block
      Tip:

      The engine will not crank because the relay is not installed.

    3. Reinstall the ST relay.

      Result
      Result Proceed to
      OK A
      NG (A/T models) B
      NG (M/T models) C

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    CHECK HARNESS AND CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)


    1. Remove the ST relay from the engine room relay block.

    2. Disconnect the park/neutral position switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - B5-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 or B5-5 - Body ground Always 10 kΩ or higher

    4. Reinstall the ST relay.

    5. Reconnect the park/neutral position switch assembly connector.


  4. Click here

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park/neutral position switch assembly (Click herefor U151E,Click herefor U151F).

      Result
      Result Proceed to
      OK A
      NG (for U151E) B
      NG (for U151F) C

  5. Click here

    CHECK HARNESS AND CONNECTOR


    1. Disconnect the ECM connector.

    2. Disconnect the ignition switch assembly connector.

    3. Disconnect the park/neutral position switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B42-2 (NSW) - D21-3 (ST1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B42-2 (NSW) or D21-3 (ST1) or B5-4 - Body ground Always 10 kΩ or higher

    5. Reconnect the ECM connector.

    6. Reconnect the ignition switch assembly connector.

    7. Reconnect the park/neutral position switch assembly connector.


  6. Click here

    CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)


    1. Disconnect the ECM connector.

    2. Disconnect the park/neutral position switch assembly connector.

    3. Remove the ST relay from the engine room relay block.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B5-5 or D55-10 (STA) - Body ground Always 10 kΩ or higher

    5. Reconnect the ECM connector.

    6. Reconnect the park/neutral position switch assembly connector.

    7. Reinstall the ST relay.


  7. Click here

    INSPECT IGNITION SWITCH ASSEMBLY


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


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    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

  11. Click here

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLYClick here

  12. Click here

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLYClick here

  13. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)

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    REPLACE IGNITION SWITCH ASSEMBLYClick here

  16. Click here

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