Sfi System Cranking Holding Function Circuit

Engine. Camry. Acv40 Gsv40
2Gr-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CRANKING

READ VALUE USING INTELLIGENT TESTER (STA SIGNAL)

INSPECT ECM (STSW VOLTAGE)

INSPECT ECM (STAR VOLTAGE)

INSPECT ST CUT RELAY

INSPECT PARK/NEUTRAL SWITCH ASSEMBLY

INSPECT STARTER RELAY

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - STARTER RELAY)

INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)

INSPECT STARTER ASSEMBLY

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)

SFI SYSTEM - 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 judges that the engine has started , the system cuts current to the starter. When the ECM receives the STSW signal, the ACC (Accessory) relay is turned off to prevent flickering of the combination meter, clock and audio system. Also, the STAR output signal travels through the ST cut relay and the park/neutral position switch assembly to the ST relay, causing the starter to activate.
When the engine is cranking, the starter operation signal is received by the STA terminal of the ECM.

Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit


WIRING DIAGRAM

Refer to DTC P0617 (Link).

INSPECTION PROCEDURE

1.CHECK CRANKING

  1. When starting the engine, check whether the starter motor starts.



OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.READ VALUE USING INTELLIGENT TESTER (STA SIGNAL)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the intelligent tester on.

  1. Select the following menu items: Powertrain / Engine / Data List / Starter Signal. Read the values.

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

    Standard:

    Display (Starter Signal)
    		Condition
    OFF
    		Engine switch on (IG)
    ON
    		Engine start


OK
Go to step 7
NG


3.INSPECT ECM (STSW VOLTAGE)


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the A24 (RHD) or A55 (LHD) ECM Connector.

  1. Measure the voltage between the terminal of the ECM connector and body ground while cranking the engine.

    Standard voltage:
    RHD:
    Tester Connection
    		Specified Condition
    STSW (A24-14) - Body ground
    		11 to 14 V
    LHD:
    Tester Connection
    		Specified Condition
    STSW (A55-14) - Body ground
    		11 to 14 V

  1. Reconnect the ECM connector.



NG
Go to step 11
OK


4.INSPECT ECM (STAR VOLTAGE)


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the engine room R/B.

  1. Measure the voltage between the terminals of the engine room R/B and body ground while cranking the engine.

    Standard voltage:
    Tester Connection
    		Specified Condition
    ST CUT relay (3) - Body ground
    		11 to 14 V

  1. Reinstall the ST CUT relay.



NG
Go to step 8
OK


5.INSPECT ST CUT RELAY


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the engine room R/B.

  1. Measure the resistance between the terminals.

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

  1. Reinstall the ST CUT relay.



NG
REPLACE ST CUT RELAY
OK


6.INSPECT PARK/NEUTRAL SWITCH ASSEMBLY


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Inspect the Park/Neutral Position (PNP) switch.

    1. Disconnect the C1 switch connector.

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

      Standard resistance:
      Gear Selector Lever Position
      		Tester Connection
      		Specified Condition
      P
      		4 - 5
      		Below 1 Ω
      N
      		4 - 5
      		Below 1 Ω

    3. Reconnect the PNP switch connector.



NG
REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (CAMRY_ACV40 RM0000016E102IX.html)
OK

CHECK HARNESS AND CONNECTOR

7.INSPECT STARTER RELAY


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST relay from the engine room R/B.

  1. Measure the resistance between the terminals.

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

  1. Reinstall the ST relay.



NG
REPLACE STARTER RELAY
OK


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


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the C1 park/neutral position switch connector.

  1. Remove the ST relay from the engine room R/B.

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

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    C1-9 - ST relay terminal (1)
    		Below 1 Ω
    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    C1-9 or ST relay terminal (1) - Body ground
    		10 kΩ or higher

  1. Reinstall the ST relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Remove the ST relay from the engine room R/B.

  1. Measure the voltage between the terminals of the engine room R/B and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    ST relay (5) - Body ground
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.INSPECT STARTER ASSEMBLY

  1. Inspect the starter assembly (CAMRY_ACV40 RM000000YQ201EX.html).



NG
REPAIR OR REPLACE STARTER ASSEMBLY
OK

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

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


    Camry. Acv40 Gsv40.2Gr-Fe Engine Control System.Sfi System.Sfi System Cranking Holding Function Circuit

  1. Disconnect the E9 main body ECU connector.

  1. Disconnect the A24 (RHD) or A55 (LHD) ECM connector.

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

    Standard resistance (Check for open):
    RHD:
    Tester Connection
    		Specified Condition
    STSW (E9-4) - STSW (A24-14)
    		Below 1 Ω
    LHD:
    Tester Connection
    		Specified Condition
    STSW (E9-4) - STSW (A55-14)
    		Below 1 Ω

    Standard resistance (Check for short):
    RHD:
    Tester Connection
    		Specified Condition
    STSW (E9-4) or STSW (A24-14) - Body ground
    		10 kΩ or higher
    LHD:
    Tester Connection
    		Specified Condition
    STSW (E9-4) or STSW (A55-14) - Body ground
    		10 kΩ or higher

  1. Reconnect the main body ECU connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO ENTRY AND START SYSTEM (CAMRY_ACV40 RM000000YEF060X.html)