ECD SYSTEM (w/o DPF) Cranking Holding Function Circuit

DESCRIPTION

The cranking holding control system provides current to the starter when the ECM detects the ignition switch start signal (STSW). When the ECM performs a firing judgment, the system cuts current to the starter. When an ECM receives the STSW signal, it turns on the ST CUT relay, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM STAR terminal of the ECMl. Then the STAR output signal travels through the park/neutral position (PNP) switch to the ST relay, causing the starter to activate.

When the engine is cranking, the starter operation signal is sent to the ECM STA terminal of the ECM.

A0155K5E76

WIRING DIAGRAM

Refer to DTC P0617 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CRANKING


    1. Check the cranking of the engine.

      Result
      Test Result Proceed to
      Cranking possible and holding control operates A
      Does not crank B
      Cranking possible but holding control does not operate C

    B

    READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL) Click here

    C

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM) Click here

    A

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. Read the values.

    6. Check the result when the ignition switch is turned to ON and when the engine is started.

      OK
      Ignition Switch Condition Display (Starter Signal)
      ON OFF
      Engine started ON

    NG

    INSPECT STARTER CUT RELAY (ST CUT) Click here

    OK

  3. INSPECT STARTER RELAY (ST)


    1. Inspect the starter relay (ST) Click here.


    NG

    REPLACE STARTER RELAY (ST)

    OK

  4. CHECK HARNESS AND CONNECTOR (PNP SWITCH - ST RELAY)

    A015BVZE02

    1. Disconnect the Park/Neutral Position (PNP) switch.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay (2) - C24-5 Always Below 1 Ω
      ST relay (2) or D24-5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A01571UE02

    1. 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 Condition Specified Condition
      ST relay (1) - ST relay (5) Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY (ST) - BATTERY, BODY GROUND)

    OK

  6. INSPECT STARTER


    1. Inspect the starter Click here.

      Result
      Test Result Proceed to
      OK A
      NG B

    B

    REPLACE STARTER Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER - STARTER RELAY (ST), BATTERY)

  7. INSPECT STARTER CUT RELAY (ST CUT)


    1. Inspect the starter cut relay (ST CUT) Click here.


    NG

    REPLACE STARTER CUT RELAY (ST CUT)

    OK

  8. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM)

    A015CZ9E15

    1. Remove the starter cut relay (ST CUT) from the engine room relay block.

    2. Disconnect the PNP switch connector.

    3. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      ST CUT relay (5) - C45-51 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C45-51 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or C24-4 (B) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      ST CUT relay (5) - C46-51 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C46-51 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or C24-4 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT PARK/NEUTRAL POSITION SWITCH


    1. A0158Z9E06

      Inspect the Park/Neutral Position (PNP) switch.


      1. Disconnect the PNP switch connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        4 (B) - 5 (L) Shift lever in P Below 1 Ω
        Shift lever in N Below 1 Ω

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (PNP SWITCH - ECM)

    A015CRWE15

    1. Disconnect the PNP switch connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C24-5 (L) - A38-48 (STA) Always Below 1 Ω
      C24-5 (L) or A38-48 (STA) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      C24-5 (L) - A52-48 (STA) Always Below 1 Ω
      C24-5 (L) or A52-48 (STA) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE ECM Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)

    A0156PKE04

    1. Disconnect the main body ECU connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      E4-4 (STSW) - A38-14 (STSW) Always Below 1 Ω
      E4-4 (STSW) or A38-14 (STSW) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      E4-4 (STSW) - A52-14 (STSW) Always Below 1 Ω
      E4-4 (STSW) or A52-14 (STSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM)

    A015CZ9E15

    1. Remove the starter cut relay (ST CUT) from the engine room relay block.

    2. Disconnect the PNP switch connector.

    3. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      ST CUT relay (5) - C45-51 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C45-51 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or C24-4 (B) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      ST CUT relay (5) - C46-51 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C46-51 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or C24-4 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  13. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  14. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check the starter operation.

      OK
      Malfunction has been repaired successfully.

    NG

    GO TO ENTRY AND START SYSTEM (ENGINE DOES NOT START) Click here

    OK

    END