ECD SYSTEM Cranking Holding Function Circuit

DESCRIPTION

w/ Entry and Start System

• While the engine is being cranked, the ECM receives the STA signal from the certification ECU (smart key ECU assembly), and then the ECM performs starting based on its signal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. 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 tester on.

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

   5. Read the values.

      OK
      Ignition Switch Position Starter Signal ON OFF START ON

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

2. CHECK ST RELAY (POWER SOURCE)

   
   
   1. 

      Text in Illustration

      *1	Engine Room Main Relay Block
      *2	ST Relay Holder

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition ST relay terminal 2 - Body ground Engine cranking 11 to 14 V

   3. Reinstall the ST relay.

      Result
      Result Proceed to OK A NG (Manual transaxle) B NG (Multi-mode manual transaxle) C

   
   

   B

   CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH ASSEMBLY) Click here

   C

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

   A

3. INSPECT ST RELAY

   
   

   1. Inspect the ST relay Click here.

   
   

   NG

   REPLACE ST RELAY

   OK

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

   
   

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition ST relay terminal 2 - Body ground Always Below 1 Ω

   3. Reconnect the ST relay.

      Result
      Result Proceed to OK (Manual transaxle) A OK (Multi-mode manual transaxle) B NG C

   
   

   A

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

   B

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

   C

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

5. CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH ASSEMBLY)

   
   

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

   2. Disconnect the clutch start 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 - A39-1 Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition ST relay terminal 2 or A39-1 Body ground Always 10 kΩ or higher

   4. Reinstall the ST relay.

   5. Reconnect the clutch start switch assembly connector.

   
   

   NG

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

   OK

6. INSPECT CLUTCH START SWITCH ASSEMBLY

   
   

   1. Inspect the clutch start switch assembly Click here.

   
   

   NG

   REPLACE CLUTCH START SWITCH ASSEMBLY Click here

   OK

7. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - CERTIFICATION ECU)

   
   

   1. Disconnect the clutch start switch assembly connector.

   2. Disconnect the certification ECU (smart key ECU 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 A39-2 - F65-5 (STAR) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition A39-2 or F65-5 (STAR) - Body ground Always 10 kΩ or higher

   4. Reconnect the clutch start switch assembly connector.

   5. Reconnect the certification ECU (smart key ECU assembly) connector.

   
   

   OK

   GO TO ENTRY AND START SYSTEM Click here

   NG

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

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

   
   

   1. Remove the ST relay from the engine room main 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 - E2-1 Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition ST relay terminal 2 or E2-1 - Body ground Always 10 kΩ or higher

   4. Reinstall the ST relay.

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

   
   

   NG

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

   OK

9. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

   
   

   1. Inspect the park/neutral position switch assembly Click here.

   
   

   NG

   REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

   OK

10. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - CERTIFICATION ECU)

    
    

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

    2. Disconnect the certification ECU (smart key ECU 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 E2-2 - F65-5 (STAR) Always Below 1 Ω

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition E2-2 or F65-5 (STAR) - Body ground Always 10 kΩ or higher

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

    5. Reconnect the certification ECU (smart key ECU assembly) connector.

    
    

    OK

    GO TO ENTRY AND START SYSTEM Click here

    NG

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