Vehicle Stability Control System (W/ Vdim) Terminals Of Ecu

Brake. Lexus Is250, Is220D. Gse20 Ale20
Brake Control. Lexus Is250, Is220D. Gse20 Ale20

  1. CHECK BATTERY VOLTAGE

  1. SKID CONTROL ECU INSPECTION

Vehicle Stability Control System (W/ Vdim) -- Terminals Of Ecu



CHECK BATTERY VOLTAGE

  1. Check the battery voltage.

    Standard voltage:
    10 to 14 V

SKID CONTROL ECU INSPECTION

  1. Measure the voltage between each terminal or between each terminal and the body ground.

  2. Connect the intelligent tester to the DLC3, and check the communication condition with the skid control ECU.



  3. Using an oscilloscope, check that the pulse generates between each terminal or between each terminal and the body ground.

    NOTICE:
    Inspection should be performed from the back of the connector with the connector connected to the skid control ECU.

    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/ Vdim) Terminals Of Ecu

    HINT:
    Inspect the ECU from the wire harness side while the connector is connected.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SFRR (A35 (*1), J98 (*2)-1) - Body ground
    		GR - Body ground
    		Front decrease solenoid RH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    SRLR (A35 (*1), J98 (*2)-2) - Body ground
    		R (*1), P (*2) - Body ground
    		Rear decrease solenoid LH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    MR (A35 (*1), J98 (*2)-3) - Body ground
    		L-B (*1), L (*2) - Body ground
    		Motor relay output
    		Engine switch on (IG)
    		10 to 14 V
    FLO (A35 (*1), J98 (*2)-4) - Body ground (*3)
    		R-L (*1), B (*2) - Body ground
    		Front wheel speed signal LH output
    		During the drive
    		Pulse generation
    (see waveform 1)
    FRO (A35 (*1), J98 (*2)-5) - Body ground (*3)
    		G-W (*1), BR (*2) - Body ground
    		Front wheel speed signal RH output
    		During the drive
    		Pulse generation
    (see waveform 1)
    FR- (A35 (*1), J98 (*2)-7) - Body ground
    		G - Body ground
    		Front wheel speed sensor RH input
    		Vehicle speed (forward or back) input
    		Pulse generation
    (see waveform 2)
    FR+ (A35 (*1), J98 (*2)-8) - Body ground
    		 L - Body ground
    		Front wheel speed sensor power supply RH output
    		Engine switch on (IG)
    		10 to 14 V
    FL+ (A35 (*1), J98 (*2)-9) - Body ground
    		P - Body ground
    		Front wheel speed sensor power supply LH output
    		Engine switch on (IG)
    		10 to 14 V
    FL- (A35 (*1), J98 (*2)-10) - Body ground
    		L - Body ground
    		Front wheel speed sensor LH input
    		Vehicle speed (forward or back) input
    		Pulse generation
    (see waveform 2)
    R+ (A35 (*1), J98 (*2)-11) - Body ground
    		G - Body ground
    		Solenoid relay power supply
    		Engine switch on (IG)
    		10 to 14 V
    SRRR (A35 (*1), J98 (*2)-12) - Body ground
    		W-L (*1), O (*2) - Body ground
    		Rear decrease solenoid RH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    SFLR (A35 (*1), J98 (*2)-13) - Body ground
    		W (*1), SB (*2) - Body ground
    		Front decrease solenoid RH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    SSEL (A35 (*1), J98 (*2)-14) - Body ground
    		Y-B (*1), Y (*2) - Body ground
    		Solenoid characteristic identification input 1
    		Engine start
    		Low: 0 V (Normal)
    Middle: 3.7 to 8.26 V
    High: 7.8 to 14 V
    SEL2 (A35 (*1), J98 (*2)-16) - Body ground
    		B-L (*1), B (*2) - Body ground
    		Solenoid characteristic identification input 2
    		Engine start
    		Low: 0 V (Normal)
    Middle: 3.7 to 8.26 V
    High: 7.8 to 14 V
    FSW+ (A35 (*1), J98 (*2)-18) - Body ground
    		G-B (*1), LG (*2) - Body ground
    		Brake pedal load sensing switch input
    		Stop light switch ON → OFF (Brake pedal depressed → released)
    		Approx. 1 kΩ →
    Approx. 213 Ω
    GND3 (A35 (*1), J98 (*2)-22) - Body ground
    		W-B - Body ground
    		Skid control ECU ground 3
    		Always
    		Below 1 Ω
    IG1 (J77-1) - Body ground
    		B - Body ground
    		IG1 power supply
    		Engine switch on (IG)
    		10 to 14 V
    RL- (J77-3) - Body ground
    		B - Body ground
    		Rear wheel speed sensor LH input
    		Vehicle speed (forward or back) input
    		Pulse generation
    (see waveform 2)
    RL+ (J77-4) - Body ground
    		LG - Body ground
    		Rear wheel speed sensor power supply LH output
    		Engine switch on (IG)
    		10 to 14 V
    RR+ (J77-5) - Body ground
    		B - Body ground
    		Rear wheel speed sensor power supply RH output
    		Engine switch on (IG)
    		10 to 14 V
    RR- (J77-6) - Body ground
    		G - Body ground
    		Rear wheel speed sensor RH input
    		Vehicle speed (forward or back) input
    		Pulse generation
    (see waveform 2)
    CSW (J77-7) - Body ground
    		P - Body ground
    		Traction OFF switch input
    		Traction OFF switch ON → OFF
    		Below 1 Ω →
    10 kΩ or higher
    CANH (J77-8) - Body ground
    		R - Body ground
    		CAN communication line H
    		Engine switch off
    		54 to 67 Ω
    SP1 (J77-9) - Body ground
    		V - Body ground
    		Speed signal output for combination meter
    		During the drive
    		Pulse generation
    (see waveform 3)
    STP (J77-10) - Body ground
    		R - Body ground
    		Stop light switch input
    		Stop light switch ON → OFF (Brake pedal depressed → released)
    		10 to 14 V →
    Below 1.5 V
    BZ (J77-11) - Body ground
    		L - Body ground
    		Skid control buzzer output
    		Engine switch on (IG), buzzer sounds → does not sound
    		Below 1 V →
    10 to 14 V
    D/G (J77-12) - Body ground
    		R - Body ground
    		Diagnosis tester communication line
    		Engine switch on (IG)
    		10 to 14 V
    TS (J77-13) - Body ground
    		SB - Body ground
    		Sensor check activation input
    		Engine switch on (IG), terminals TS and CG of DLC3 connect → disconnect
    		Below 1.5 V →
    10 to 14 V
    PKB (J77-14) - Body ground
    		R-B - Body ground
    		Parking brake switch input
    		Engine switch on (IG), parking brake switch ON → OFF
    		Below 1 Ω →
    10 kΩ or higher
    WFSE (J77-15) - Body ground
    		GR - Body ground
    		ECU program rewrite input
    		-
    		-
    CANL (J77-16) - Body ground
    		W - Body ground
    		CAN communication line L
    		Engine switch off
    		54 to 67 Ω
    MRF (J78-1) - Body ground
    		L-B - Body ground
    		Fail safe motor relay output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		Below 1 V
    SR (J78-2) - Body ground
    		V - Body ground
    		Solenoid relay output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		Below 1 V
    PMC (J78-4) - Body ground
    		R - Body ground
    		Master cylinder pressure sensor input
    		Engine switch on (IG), brake pedal released
    		0.3 to 0.8 V
    E2 (J78-6) - Body ground
    		W - Body ground
    		Master cylinder pressure sensor ground
    		Always
    		Below 1 Ω
    RRA+ (J78-7) - Body ground
    		L - Body ground
    		Rear holding solenoid (+) RH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    FLA- (J78-8) - Body ground
    		W - Body ground
    		Front holding solenoid (-) LH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    RLA+ (J78-9) - Body ground
    		G - Body ground
    		Rear holding solenoid (+) LH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    FRA- (J78-10) - Body ground
    		GR - Body ground
    		Front holding solenoid (-) RH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    SM2+ (J78-11) - Body ground
    		B - Body ground
    		Master cut linear solenoid 2 (+) output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		Below 1 V
    SM1- (J78-12) - Body ground
    		R - Body ground
    		Master cut linear solenoid 1 (-) output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		Below 1 V
    AST (J78-13) - Body ground
    		Y - Body ground
    		Linear solenoid power supply
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    GND2 (J78-14) - Body ground
    		W-B - Body ground
    		Skid control ECU ground 2
    		Always
    		Below 1 Ω
    MT (J78-15) - Body ground
    		GR - Body ground
    		Motor relay test input
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		Below 1 V
    VCM (J78-18) - Body ground
    		B - Body ground
    		Master cylinder pressure sensor power supply output
    		Engine switch on (IG)
    		4.5 to 5.5 V
    FSS (J78-19) - Body ground
    		-
    		Master cylinder pressure sensor shielded ground
    		Always
    		Below 1 Ω
    RRA- (J78-20) - Body ground
    		O - Body ground
    		Rear holding solenoid (-) RH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    FLA+ (J78-21) - Body ground
    		V - Body ground
    		Front holding solenoid (+) LH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    RLA- (J78-22) - Body ground
    		P - Body ground
    		Rear holding solenoid (-) LH output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		10 to 14 V
    FRA+ (J78-23) - Body ground
    		LG - Body ground
    		Front holding solenoid (+) RH output
    		Approx. 1.5 seconds after turning engine switch on (IG
    		10 to 14 V
    SM2- (J78-24) - Body ground
    		BR - Body ground
    		Master cut linear solenoid 2 (-) output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		Below 1 V
    SM1+ (J78-25) - Body ground
    		SB - Body ground
    		Master cut linear solenoid 1 (+) output
    		Approx. 1.5 seconds after turning engine switch on (IG)
    		Below 1 V
    GND1 (J78-26) - Body ground
    		W-B - Body ground
    		Skid control ECU ground 1
    		Always
    		Below 1 Ω
    (*1): LHD
    (*2): RHD
    (*3): AFS


    4. Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/ Vdim) Terminals Of Ecu

  4. Waveform 1 (Reference): Using an oscilloscope:

    Item
    		Condition
    Tool setting
    		5 V/DIV., 5 ms./DIV.
    Vehicle condition
    		While driving at approximately 12 mph (20 km/h)
    HINT:
    As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.


    5. Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/ Vdim) Terminals Of Ecu

  5. Waveform 2 (Reference): Using an oscilloscope:

    Item
    		Condition
    Tool setting
    		0.5 V/DIV., 2 ms./DIV.
    Vehicle condition
    		Forward or back
    HINT:
    As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.


    6. Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/ Vdim) Terminals Of Ecu

  6. Waveform 3 (Reference): Using an oscilloscope:

    Item
    		Condition
    Tool setting
    		5 V/DIV., 50 ms./DIV.
    Vehicle condition
    		While driving at approximately 12 mph (20 km/h)
    HINT:
    As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.