ECD SYSTEM(w/ DPF) Cranking Holding Function Circuit

DESCRIPTION

The cranking holding control system provides current to the starter when the ECM detects the engine 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 ECM. 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.

A01XBQLE82

WIRING DIAGRAM

Refer to DTC P0617 Click here.

CAUTION / NOTICE / HINT

Note


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

  • After replacing the ECM, the new ECM needs registration (See page ) and initialization Click here.

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

    A

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

    C

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

    B

  2. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the values.

    6. Check the result when the engine switch is turned on (IG) and when the engine is started.

      OK
      Engine Switch Condition Display (Starter Signal)
      On (IG) Close
      Engine started Open

    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)

    A01X9Y6E01
    *1 Front view of wire harness connector: (to Engine Room Relay Block)
    *2 Front view of wire harness connector: (to PNP Switch)

    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 (L) Always Below 1 Ω
      ST relay (2) or C24-5 (L) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A01X94IE01
    *1 Front view of wire harness connector: (to Engine Room Relay Block)

    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

    A

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

    B

    REPLACE STARTER Click here

  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)

    A01X032E01

    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) - C45-52 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C45-52 (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) - C46-52 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C46-52 (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. A01X5VFE06
      *1 Component without harness connected: (Park/Neutral Position Switch)

      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)

    A01X8CVE01

    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) - A38-46 (STA) Always Below 1 Ω
      C24-5 (L) or A38-46 (STA) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      C24-5 (L) - A52-46 (STA) Always Below 1 Ω
      C24-5 (L) or A52-46 (STA) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK B

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE ECM Click here

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

    A01XA0TE01

    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) - A38-47 (STSW) Always Below 1 Ω
      E4-4 (STSW) or A38-47 (STSW) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      E4-4 (STSW) - A52-47 (STSW) Always Below 1 Ω
      E4-4 (STSW) or A52-47 (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)

    A01X032E01

    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) - C45-52 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C45-52 (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) - C46-52 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 (B) Always Below 1 Ω
      ST CUT relay (5) or C46-52 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or C24-4 (B) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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.

    OK

    END

    NG

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