Sfi System Cranking Holding Function Circuit

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
2Az-Fe Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER

INSPECT ECM (STSW TERMINAL VOLTAGE)

INSPECT ECM (STAR OUTPUT VOLTAGE)

INSPECT CLUTCH START SWITCH ASSEMBLY OR PARK / NEUTRAL POSITION SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (ECM - MAIN BODY ECU)

INSPECT ST CUT RELAY

INSPECT NO. 7 RELAY BLOCK (RELAY HOLDER TERMINAL VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - CLUTCH START SWITCH OR PARK / NEUTRAL POSITION SWITCH ASSEMBLY - MAIN BODY ECU)

INSPECT NO. 7 RELAY BLOCK (CHECK FOR SHORT)

CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH OR PARK / NEUTRAL POSITION SWITCH ASSEMBLY - ECM - ST RELAY)

INSPECT BATTERY

CHECK BATTERY TERMINAL

SFI SYSTEM - Cranking Holding Function Circuit


DESCRIPTION

The cranking holding control system keeps energizing the ST relay after the ECM detects the starter signal (STSW signal) from the main body ECU until the ECM performs a judgment of "Engine started". Furthermore, the ECM outputs an accessory cut signal (ACCR signal) to the ACC relay during cranking to prevent flickering of the combination meter, clock, audio system, and so on.
When the ECM detects the STSW signal, the ECM outputs the starter relay drive signal (STAR signal) to the starter relay through the clutch start switch or park / neutral position switch, and then, the engine is cranked. When the ECM receives a stable engine speed signal (NE signal), more specifically, when the NE signal reaches a predetermined value, the ECM stops outputting the STAR signal. Also, the ECM monitors the ST relay operating conditions based on the STA terminal voltage status.

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit


WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Check the result when the ignition switch is turned on (IG).

  1. Check the result when the engine starts.

    Standard:
    Ignition Switch Condition
    		Tester Display (Starter Signal)
    on (IG)
    		OFF
    Engine starts
    		ON


OK
Go to step 10
NG


2.INSPECT ECM (STSW TERMINAL VOLTAGE)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the A12 ECM connector.

  1. Depress the clutch pedal fully (for M/T models).

  1. Shift lever is P position (for A/T models).

  1. Measure the voltage between the ECM terminal and the body ground when operating the ignition switch to start cranking.

    Standard voltage:
    Tester Connection
    		Specified Condition
    STSW (A12-14) - Body ground
    		10 to 14 V

  1. Reconnect the ECM connector.



NG
Go to step 5
OK


3.INSPECT ECM (STAR OUTPUT VOLTAGE)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the A4 clutch start switch connector (for M/T models).



    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the B28 Park / Neutral Position (PNP) switch connector (for A/T models)

  1. Measure the voltage between the terminal of clutch start switch or PNP switch connector and the body ground while cranking the engine.

    Standard voltage:
    M/T
    Tester Connection
    		Specified Condition
    B (A4-2) - Body ground
    		10 to 14 V
    A/T:
    Tester Connection
    		Specified Condition
    B (B28-4) - Body ground
    		10 to 14 V

  1. Reconnect the clutch start switch connector.

  1. Reconnect the PNP switch connector.



NG
Go to step 6
OK


4.INSPECT CLUTCH START SWITCH ASSEMBLY OR PARK / NEUTRAL POSITION SWITCH ASSEMBLY


  1. M/T:

    1. Disconnect the A4 clutch start switch connector.



      2. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

    2. Measure the resistance between the terminals of the clutch start switch assembly connector.

      Standard resistance:
      Switch Condition
      		Specified Condition
      Pushed in
      		Below 1 Ω
      Released
      		10 kΩ or higher


  1. A/T:

    1. Disconnect the B28 PNP switch connector.



      2. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

    2. Measure the resistance between each terminal shown below when the shift lever is moved to each range.

      Standard resistance:
      Shift Position
      		Tester Connection
      		Specified Condition
      P
      		PL (6) - RB (2)
      		Below 1 Ω
      L (5) - B (4)
      R
      		RL (1) - RB (2)
      N
      		NL (9) - RB (2)
      L (5) - B (4)
      D
      		DL (7) - RB (2)
      2
      		2L (3) - RB (2)
      L
      		LL (8) - RB (2)


OK
Go to step 10
NG

REPLACE CLUTCH START SWITCH ASSEMBLY OR PARK / NEUTRAL POSITION SWITCH ASSEMBLY

5.CHECK HARNESS AND CONNECTOR (ECM - MAIN BODY ECU)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the E20 main body ECU connector.

  1. Disconnect the A12 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    STSW (E20-4) - STSW (A12-14)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    STSW (E20-4) - Body ground
    		Below 1 Ω

  1. Reconnect the main body ECU connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ENTRY AND START SYSTEM

6.INSPECT ST CUT RELAY
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω
    (When battery voltage applied to terminals 1 and 2)

  1. Reinstall the relay.



NG
REPLACE ST CUT RELAY
OK


7.INSPECT NO. 7 RELAY BLOCK (RELAY HOLDER TERMINAL VOLTAGE)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage between the terminals of the ST CUT relay holder.

    Standard voltage:
    Tester Connection
    		Specified Condition
    1 - 2
    		10 to 14 V

  1. Reinstall the relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (ECM - CLUTCH START SWITCH OR PARK / NEUTRAL POSITION SWITCH ASSEMBLY - MAIN BODY ECU)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Disconnect the A4 clutch start switch assembly connector (for M/T models).

  1. Disconnect the B28 PNP switch assembly connector (for A/T models).

  1. Disconnect the E20 main body ECU connector.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    ST CUT relay (3) - STAR (B32-52)
    		Below 1 Ω
    ST CUT relay (3) - STR2 (E20-14)
    		Below 1 Ω
    STR (E20-3) - ST CUT relay (5)
    		Below 1 Ω
    B (A4-2)*1 - ST CUT relay (5)
    		Below 1 Ω
    B (B28-4)*2 - ST CUT relay (5)
    		Below 1 Ω
    HINT:
    1. *1: M/T
    2. *2: A/T
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    ST CUT relay (3) - Body ground
    		10 kΩ or higher
    ST CUT relay (5) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the main body ECU connector.

  1. Reconnect the clutch start switch assembly connector.

  1. Reconnect the PNP switch assembly connector.

  1. Reinstall the ST CUT relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.INSPECT NO. 7 RELAY BLOCK (CHECK FOR SHORT)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the ECM connector.

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Measure the resistance between the terminals of the ST CUT relay holder.

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    No. 7 Relay block ST CUT relay (3) - Body ground
    		10 kΩ or higher
    No. 7 Relay block ST CUT relay (5) - Body ground
    		10 kΩ or higher

  1. Reinstall the ST CUT relay.

  1. Reconnect the ECM connector.



NG
CHECK ENTRY AND START SYSTEM
OK

REPLACE ECM

10.CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH OR PARK / NEUTRAL POSITION SWITCH ASSEMBLY - ECM - ST RELAY)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST relay from the No. 7 relay block (for LHD).

  1. Remove the ST relay from the No. 8 relay block (for RHD).

  1. Disconnect the A4 clutch start switch assembly connector (for M/T models).

  1. Disconnect the B28 PNP switch assembly connector (for A/T models).

  1. Disconnect the A12 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    L (A4-1)*1 - STA (A12-48)
    		Below 1 Ω
    L (A4-1)*1 - ST relay (1)
    		Below 1 Ω
    L (B28-5)*2 - STA (A12-48)
    		Below 1 Ω
    L (B28-5)*2 - ST relay (1)
    		Below 1 Ω
    ST relay (2) - Body ground
    		Below 1 Ω
    HINT:
    1. *1: M/T
    2. *2: A/T
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    L (A4-1)*1 - Body ground
    		10 kΩ or higher
    L (B28-5)*2 - Body ground
    		10 kΩ or higher
    HINT:
    1. *1: M/T
    2. *2: A/T

  1. Reinstall the ST relay.

  1. Reconnect the clutch start switch connector.

  1. Reconnect the PNP switch assembly connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.INSPECT BATTERY

  1. Check that the battery is not depleted.

    OK:
    Battery is not depleted.


NG
REPLACE BATTERY
OK


12.CHECK BATTERY TERMINAL

  1. Check that the battery terminals are not loose or corroded.

    OK:
    Battery terminals are not loose or corroded.


NG
REPAIR OR REPLACE BATTERY TERMINAL
OK

CHECK AND REPLACE STARTER POWER SOURCE CIRCUIT