Sfi System (For Sedan) Cranking Holding Function Circuit

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (STARTER SIGNAL)

INSPECT ECM (STSW VOLTAGE)

INSPECT ECM (STAR VOLTAGE)

INSPECT PARK/NEUTRAL POSITION SWITCH

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

INSPECT ECM (STAR VOLTAGE)

INSPECT CLUTCH START SWITCH

CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM)

INSPECT IGNITION SWITCH

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - PARK/NEUTRAL POSITION SWITCH - ECM)

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CLUTCH START SWITCH - ECM)

INSPECT BATTERY

CHECK BATTERY TERMINAL

CHECK HARNESS AND CONNECTOR (PNP SWITCH OR CLUTCH START SWITCH - ST RELAY)

SFI SYSTEM (for Sedan) - Cranking Holding Function Circuit


DESCRIPTION

The cranking holding control system provides a current to the starter when the ECM detects the ignition switch's start signal (STSW). When the ECM judges that the engine has started, the system cuts the current to the starter. When the ECM receives the STSW signal, it turns on the ACC (Accessory) relay, which prevents flickering of the combination meter, clock and audio system. Also, the ECM sends a signal to the ECM's STAR terminal. Then the STAR output signal travels through the Park/Neutral Position (PNP) switch to the ST relay, causing the starter to activate. When the engine is cranking, the starter operation signal is sent to the ECM's STA terminal.

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit


WIRING DIAGRAM


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM (STARTER SIGNAL)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream on.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Engine and ECT / Starter Signal.

  1. Check the result when the ignition switch is turned to ON and START.

    OK:
    Ignition Switch Position
    		Starter Signal
    ON
    		Close (Starter signal OFF)
    START
    		Open (Starter signal ON)
    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
Go to step 12
A


2.INSPECT ECM (STSW VOLTAGE)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the A21 ECM connector.

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

    Standard voltage:
    Tester Connections
    		Specified Conditions
    STSW (A21-14) - Body ground
    		11 to 14 V
Result:
Result
Proceed to
Within standard range(A/T)
A
Within standard range (M/T)
B
Outside standard range
C

  1. Reconnect the ECM connector.



B
Go to step 6

C
Go to step 9
A


3.INSPECT ECM (STAR VOLTAGE)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the C27 Park/Neutral Position (PNP) switch connector.

  1. Measure the voltage between the terminals of the PNP switch connector and body ground while cranking the engine.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    B (C27-4) - Body ground
    		11 to 14 V

  1. Reconnect the PNP switch connector.



NG
Go to step 10
OK


4.INSPECT PARK/NEUTRAL POSITION SWITCH
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the C27 PNP switch connector.

  1. Check the resistance between each terminal shown below when the shift lever is moved to each range.

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

  1. Reconnect the PNP switch connector.



NG
REPLACE PARK / NEUTRAL POSITION SWITCH (YARIS_NCP93 RM00000191D031X.html)
OK


5.CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the C27 PNP switch connector.

  1. Disconnect the A21 ECM connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    L (C27-5) - STA (A21-48)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    L (C27-5) or STA (A21-48) - Body ground
    		10 kΩ or higher

  1. Reconnect the PNP switch connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

6.INSPECT ECM (STAR VOLTAGE)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the A16 clutch start switch connector.

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

    Standard voltage:
    Tester Connections
    		Specified Conditions
    B (A16-2) - Body ground
    		11 to 14 V

  1. Reconnect the clutch start switch connector.



NG
Go to step 11
OK


7.INSPECT CLUTCH START SWITCH
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the A16 clutch start switch connector.

  1. Check the resistance between the terminals of the clutch start switch.

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

  1. Reconnect the clutch start switch connector.



NG
REPLACE CLUTCH START SWITCH (YARIS_NCP93 RM000001B3D00TX.html)
OK


8.CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the A16 clutch start switch connector.

  1. Disconnect the A21 ECM connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    L (A16-1) - STA (A21-48)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    L (A16-1) or STA (A21-48) - Body ground
    		10 kΩ or higher

  1. Reconnect the clutch start switch connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

9.INSPECT IGNITION SWITCH
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the D8 ignition switch connector.

  1. Check the resistance between the terminals shown below.

    Standard resistance:
    Key Positions
    		Tester Connections
    		Specified Conditions
    LOCK
    		-
    		10 kΩ or higher
    ACC
    		2 - 4
    		Below 1 Ω
    ON
    		1 - 2 - 4
    5 - 6
    START
    		1 - 3 - 4
    5 - 6 - 7

  1. Reconnect the ignition switch connector.



NG
REPLACE IGNITION SWITCH (YARIS_NCP93 RM000000WC701WX.html)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - IGNITION SWITCH - BATTERY)

10.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - PARK/NEUTRAL POSITION SWITCH - ECM)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the D8 ignition switch connector.

  1. Disconnect the C27 PNP switch connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    ST2 (D8-7) - B (C27-4)
    		Below 1 Ω
    STAR (C20-52) - B (C27-4)
    STAR (C20-52) - L (C27-5)
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    ST2 (D8-7) or B (C27-4) - Body ground
    		10 kΩ or higher
    STAR (C20-52) or B (C27-4) - Body ground
    STAR (C20-52) or L (C27-5) - Body ground

  1. Reconnect the ignition switch connector.

  1. Reconnect the PNP switch connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

11.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CLUTCH START SWITCH - ECM)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

  1. Disconnect the D8 ignition switch connector.

  1. Disconnect the A16 clutch start switch connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    ST2 (D8-7) - B (A16-2)
    		Below 1 Ω
    STAR (C20-52) - B (A16-2)
    STAR (C20-52) - L (A16-1)
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    ST2 (D8-7) or B (A16-2) - Body ground
    		10 kΩ or higher
    STAR (C20-52) or B (A16-2) - Body ground
    STAR (C20-52) or L (A16-1) - Body ground

  1. Reconnect the ignition switch connector.

  1. Reconnect the clutch start switch connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

12.INSPECT BATTERY

  1. Check that the battery is not depleted (YARIS_NCP93 RM000001E2J01FX.html).

    OK:
    Battery is not depleted.


NG
REPLACE BATTERY
OK


13.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


14.CHECK HARNESS AND CONNECTOR (PNP SWITCH OR CLUTCH START SWITCH - ST RELAY)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Cranking Holding Function Circuit

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

  1. Disconnect the C27 PNP switch connector (A/T).

  1. Disconnect the A16 clutch start switch connector (M/T).

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    L (C27-5) - ST relay (2)
    		Below 1 Ω
    L (A16-1) - ST relay (2)
    ST relay (1) - Body ground
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    L (C27-5) or ST relay (2) - Body ground
    		10 kΩ or higher
    L (A16-1) or ST relay (2) - Body ground

  1. Reinstall the ST relay.

  1. Reconnect the PNP switch connector (A/T).

  1. Reconnect the clutch start switch connector (M/T).



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK AND REPLACE STARTER RELAY AND STARTER