SFI SYSTEM Cranking Holding Function Circuit

DESCRIPTION

• While the engine is being cranked, current flows from terminal STAR of the certification ECU to clutch start switch assembly and also flows to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK WHETHER ENGINE CAN BE CRANKED

   
   

   1. Check if the engine can be cranked.

      Result

      Result	Proceed to
      Engine cannot be cranked	A
      Engine can be cranked	B

   
   

   NG

   READ VALUE USING GTS (STARTER SIGNAL) Click here

   OK

2. 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

   
   

   NG

   CHECK ST RELAY (POWER SOURCE) Click here

   OK

3. INSPECT CLUTCH START SWITCH ASSEMBLY

   
   

   1. Inspect the clutch start switch assembly Click here.

   
   

   NG

   REPLACE CLUTCH START SWITCH ASSEMBLY Click here

   OK

4. CHECK HARNESS AND CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY - CERTIFICATION ECU - ST RELAY - POWER MANAGEMENT CONTROL ECU)

   
   

   1. Disconnect the A93 ECM connector.

   2. Disconnect the A39 clutch start switch assembly connector.

   3. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

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

   5. Disconnect the A90 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A93-46 (STA) - F65-7 (STA) Always Below 1 Ω A93-46 (STA) - A39-1 Always Below 1 Ω A93-46 (STA) - 2 (ST relay holder) Always Below 1 Ω A93-46 (STA) - A90-5 (STA) Always Below 1 Ω A93-46 (STA), F65-7 (STA), A90-5 (STA), A39-1 or 2 (ST relay holder) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Disconnect the B97 ECM connector (for LHD).

   2. Disconnect the B101 ECM connector (for RHD).

   3. Disconnect the A39 clutch start switch assembly connector.

   4. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition B97-112 (NSW) - F65-5 (STAR) Always Below 1 Ω B97-112 (NSW) - A39-2 Always Below 1 Ω F65-5 (STAR) - A39-2 Always Below 1 Ω B97-112 (NSW), F65-5 (STAR) or A39-2 - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition B101-112 (NSW) - F65-5 (STAR) Always Below 1 Ω B101-112 (NSW) - A39-2 Always Below 1 Ω F65-5 (STAR) - A39-2 Always Below 1 Ω B101-112 (NSW), F65-5 (STAR) or A39-2 - Body ground Always 10 kΩ or higher

   
   

   OK

   CHECK ENTRY AND START SYSTEM (for start function) Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

6. CHECK ST RELAY (POWER SOURCE)

   

   Text in Illustration

   *1	Engine room relay Block
   *2	ST Relay Holder

   
   

   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 5 (ST relay holder) - Body ground Always 11 to 14 V

   
   

   NG

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

   OK

7. CHECK HARNESS AND CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY - ST RELAY - POWER MANAGEMENT CONTROL ECU - BODY GROUND)

   
   

   1. Disconnect the A93 ECM connector.

   2. Disconnect the A39 clutch start switch assembly connector.

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

   4. Disconnect the A90 power management control ECU connector.

   5. Disconnect the B1 starter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2 (ST relay holder) - A93-46 (STA) Always Below 1 Ω 1 (ST relay holder) - Body ground Always Below 1 Ω 3 (ST relay holder) - B1-1 Always Below 1 Ω 2 (ST relay holder) or A93-46 (STA) - Body ground Always 10 kΩ or higher 3 (ST relay holder) or B1-1 - Body ground Always 10 kΩ or higher

   
   

   OK

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

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

8. 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

   
   

   OK

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

   NG

9. CHECK HARNESS AND CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY - CERTIFICATION ECU - ST RELAY - POWER MANAGEMENT CONTROL ECU)

   
   

   1. Disconnect the A93 ECM connector.

   2. Disconnect the A39 clutch start switch assembly connector.

   3. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

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

   5. Disconnect the A90 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2 (ST relay holder) - A93-46 (STA) Always Below 1 Ω

   
   

   OK

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

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR