SFI SYSTEM Starter Signal Circuit

DESCRIPTION

1. w/o Smart Entry and Start System

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

2. w/ Smart Entry and Start System

   While the engine is being cranked, current flows from terminal STAR of the power management control ECU to the park/neutral position switch assembly and also flows to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. 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 / Data List / All Data / Starter Signal.

   5. Read the value displayed on the GTS when the ignition switch is turned to ON and the engine is started.

      OK
      Condition GTS Display Ignition switch ON OFF (starter signal OFF) Engine started ON (starter signal ON)

   
   

   NG

   CHECK ST RELAY (POWER SOURCE) Click here

   OK

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

2. CHECK ST RELAY (POWER SOURCE)

   
   

   1. Inspect the ST relay Click here.

      Result
      Result Proceed to OK A NG (w/o smart entry and start system) B NG (w/ smart entry and start system) C

   
   

   B

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

   C

   CHECK HARNESS AND CONNECTOR (ST RELAY - POWER MANAGEMENT CONTROL ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM) Click here

   A

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

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

   
   

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

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

   3. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2 (ST relay terminal) - B2-9 (L) Always Below 1 Ω 2 (ST relay terminal) - A49-48 (STA) Always Below 1 Ω 2 (ST relay terminal) or B2-9 (L) - Body ground Always 10 kΩ or higher 2 (ST relay terminal) or A49-48 (STA) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

   
   

   1. Inspect the park/neutral position switch assembly Click here for U760E, Click here for U760F).

      Result
      Result Proceed to OK A NG (for U760E) B NG (for U760F) C

   
   

   B

   REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

   C

   REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

   A

5. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ECM - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

   
   

   1. Disconnect the ignition or starter switch assembly connector.

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

   3. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition D12-1 (ST1) - B58-47 (NSW) Always Below 1 Ω D12-1 (ST1) - B2-4 (B) Always Below 1 Ω D12-1 (ST1) or B58-47 (NSW) - Body ground Always 10 kΩ or higher D12-1 (ST1) or B2-4 (B) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

6. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

   
   

   1. Inspect the ignition or starter switch assembly Click here.

   
   

   NG

   REPLACE IGNITION OR STARTER SWITCH ASSEMBLY Click here

   OK

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

7. CHECK HARNESS AND CONNECTOR (ST RELAY - POWER MANAGEMENT CONTROL ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)

   
   

   1. Disconnect the ECM connector.

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

   3. Disconnect the power management control ECU connector.

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition 2 (ST relay terminal ) - A49-48 (STA) Always Below 1 Ω 2 (ST relay terminal) - B2-9 (L) Always Below 1 Ω 2 (ST relay terminal) - D42-2 (STA) Always Below 1 Ω 2 (ST relay terminal ) or A49-48 (STA) - Body ground Always 10 kΩ or higher 2 (ST relay terminal ) or B2-9 (L) - Body ground Always 10 kΩ or higher 2 (ST relay terminal ) or D42-2 (STA) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

8. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

   
   

   1. Inspect the park/neutral position switch assembly Click here for U760E, Click here for U760F).

      Result
      Result Proceed to OK A NG (for U760E) B NG (for U760F) C

   
   

   B

   REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

   C

   REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

   A

9. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ECM - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

   
   

   1. Disconnect the power management control ECU connector.

   2. Disconnect the ECM 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
      Tester Connection Condition Specified Condition D42-3 (STAR) - B58-47 (NSW) Always Below 1 Ω D42-3 (STAR) - B2-4 (B) Always Below 1 Ω D42-3 (STAR) or B58-47 (NSW) - Body ground Always 10 kΩ or higher D42-3 (STAR) or B2-4 (B) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   GO TO SMART ENTRY AND START SYSTEM Click here