Terminals Of Ecu

TERMINALS OF ECU

Fig 1: ECU Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Symbols (Terminal No.)	Terminal Description
GND (1)	Skid control ECU ground
BS1 (2)	FR, RL linear solenoid switching valve (SMC1, SS) power supply
FRA+ (3)	FR pressure increase linear solenoid (+) output
FRR+ (4)	FR pressure decrease linear solenoid (+) output
SMC1 (5)	Master cut solenoid 1 output
BZ (6)	Skid control buzzer output
SP1 (7)	Speed signal output to combination meter
ENA (8)	Capacitor signal output
PCK1 (9)	Pressure sensor 1 stuck check output
FRO (10)	FR wheel speed signal output
RL+ (11)	RL wheel speed sensor power supply output
RL- (12)	RL wheel speed sensor input
CTY+ (13)	Start power supply input (Door)
PMC1 (14)	Master cylinder pressure sensor 1 signal input
FR+ (15)	FR wheel speed sensor power supply output
IG1 (16)	IG1 power supply
FRR- (17)	FR pressure decrease linear solenoid (-) output
FRA- (18)	FR pressure increase linear solenoid (-) output
RLR- (19)	RL pressure decrease linear solenoid (-) output
MR1 (20)	Motor relay 1 power supply output
CBI1 (21)	Capacitor power supply input 1
VBZ (22)	Skid control buzzer power supply output
FAIL (23)	Capacitor signal input
TS (25)	Signal check (Test Mode) input
PAC1 (26)	Accumulator pressure sensor 1 signal input
VCM (27)	Pressure sensor 1 power supply output
FR- (28)	FR wheel speed sensor input
+B (29)	Start power supply input (STP)
R1+ (30)	Main relay 1 power supply output
BSO3 (31)	Stroke simulator cut solenoid power supply output
BSO1 (32)	SMC1 power supply output
RLA+ (33)	RL pressure increase linear solenoid (+) output
RLR+ (34)	RL pressure decrease linear solenoid (+) output
RLA- (35)	RL pressure increase linear solenoid (-) output
R1- (36)	Motor relay 1 output
MTT (37)	Motor relay test input
DO1 (38)	+B output 1
DI1 (39)	+B input 1
SS (40)	Stroke simulator cut solenoid output
PRL (42)	RL wheel cylinder pressure sensor signal input
E (43)	Pressure sensor 1 ground
PFR (44)	FR wheel cylinder pressure sensor signal input
STP (45)	Stop light switch input
R3+ (46)	Main relay 1 output

Fig 2: Identifying A14 Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Symbols (Terminal No.)	Terminal Description
SKS2 (1)	Brake pedal stroke sensor signal 2 input
SKS (3)	Brake pedal stroke sensor signal 1 input
SKG (4)	Brake pedal stroke sensor ground
VCSK (5)	Brake pedal stroke sensor power supply output

Fig 3: Identifying Skid Control ECU A15 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Symbols (Terminal No.)	Terminal Description
GND4 (1)	Skid control ECU ground
BS2 (2)	FL, RR linear solenoid switching valve (SMC2) power supply
FLA+ (3)	FL pressure increase linear solenoid (+) output
FLR+ (4)	FL pressure decrease linear solenoid (+) output
SMC2 (6)	Master cut solenoid 2 output
PCK2 (7)	Pressure sensor 1 stuck check output
EX1 (8)*1	Pre-collision brake cancel switch input
CANH (9)	CAN communication line H
FLO (10)	FL wheel speed signal output
RR+ (11)	RR wheel speed sensor power supply output
LBL (13)	Brake fluid level warning switch input
PMC2 (14)	Master cylinder pressure sensor 2 signal input
FL+ (15)	FL wheel speed sensor power supply output
IG2 (16)	IG2 power supply
FLR- (17)	FL pressure decrease linear solenoid (-) output
FLA- (18)	FL pressure increase linear solenoid (-) output
RRA- (20)	RR pressure increase linear solenoid (-) output
R2- (21)	Motor relay 2 output
CANL (22)	CAN communication line L
PKB (23)	Parking brake switch input
RR- (27)	RR wheel speed sensor input
VCM2 (28)	Pressure sensor 2 power supply output
FL- (29)	FL wheel speed sensor input
R2+ (30)	Main relay 2 power supply output
BSO2 (32)	SMC2 power supply output
RRA+ (33)	RR pressure increase linear solenoid (+) output
RRR+ (34)	RR pressure decrease linear solenoid (+) output
RRR- (36)	RR pressure decrease linear solenoid (-) output
MR2 (37)	Motor relay 2 power supply output
DI2 (38)	+B input 2
DO2 (39)	+B output 2
CBI2 (40)	Capacitor power supply input 2
CSW (41)	VSC OFF switch input
PRR (43)	RR wheel cylinder pressure sensor signal input
E2 (44)	Pressure sensor 2 ground
PFL (45)	FL wheel cylinder pressure sensor signal input
R4+ (46)	Main relay 2 output

*1: w/ Pre-collision brake cancel switch

TERMINAL INSPECTION

Disconnect the connector and measure the voltage or resistance on the wire harness side.

Fig 4: Identifying Skid Control ECU A13 And A15 Connector Terminals

HINT:

Voltage cannot be measured with the connector connected to the skid control ECU as the connector is watertight.

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
GND (A13-1) - Body ground	W-B - Body ground	Skid control ECU ground	Always	Below 1 Ω
IG1 (A13-16) - Body ground	B-Y - Body ground	IG1 power supply	Engine switch on (IG)	10 to 14 V
+B (A13-29) - Body ground	G-R - Body ground	Start power supply input (STP)	Always	10 to 14 V
DI1 (A13-39) - Body ground	GR - Body ground	+B input 1	Always	10 to 14 V
STP (A13-45) - Body ground	R-W - Body ground	Stop light switch input	Stop light switch ON → OFF (Brake pedal depressed → released)	8 to 14 V → Below 1.5 V
GND4 (A15-1) - Body ground	W-B - Body ground	Skid control ECU ground	Always	Below 1 Ω
LBL (A15-13) - Body ground	Y-B - Body ground	Brake fluid level warning switch input	Brake fluid level is minimum level → maximum level	1.9 to 2.1 kΩ → Below 1 Ω
IG2 (A15-16) - Body ground	B-Y - Body ground	IG2 power supply	Engine switch on (IG)	10 to 14 V
PKB (A15-23) - Body ground	Y-R - Body ground	Parking brake switch input	Engine switch on (IG), parking brake switch ON → OFF	Below 1.5 V → 10 to 14 V
DI2 (A15-38) - Body ground	B - Body ground	+B input 2	Always	10 to 14 V