Terminals Of Ecu

TERMINALS OF ECU

Fig 1: Identifying ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINALS DESCRIPTION CHART

Terminal No. (Symbols)	Terminal Description
A24-1 (GND1)	Skid control ECU ground
A24-2 (+BM1)	Power supply for motor
A24-3 (FR+)	Front speed sensor RH power supply output
A24-4 (FL-)	Front speed sensor LH input
A24-5 (RR+)	Rear speed sensor RH power supply output
A24-6 (RL-)	Rear speed sensor LH input
A24-7 (STP)	Stop light switch
A24-9 (TRS)	CRAWL ON/OFF switch
A24-11 (CANH)	CAN communication terminal H
A24-12 (SP1)	Speedometer signal
A24-13 (D/G)	Diagnosis tester serial communication
A24-16 (STPO)	Stop light operation relay
A24-17 (FR-)	Front speed sensor RH input
A24-18 (FL+)	Front speed sensor LH power supply output
A24-19 (RR-)	Rear speed sensor RH input
A24-20 (RL+)	Rear speed sensor LH power supply output
A24-21 (TRM2)	CRAWL speed selector switch
A24-24 (TS)	Sensor test terminal (Signal check switch)
A24-25 (CANL)	CAN communication terminal L
A24-27 (EXI)	Center differential lock switch
A24-28 (PKB)	Parking brake input
A24-30 (BZ)	Skid control buzzer
A24-31 (+BS)	Power supply for solenoid
A24-32 (GND2)	Skid control ECU ground
A24-41 (LBL)	Brake fluid level warning switch
A24-42 (WFSE)	Write flash enable input
A24-43 (CSW)	VSC OFF switch
A24-44 (TRM1)	CRAWL speed selector switch
A24-45 (STP2)	Stop light switch
A24-46 (IG1)	IG1 power supply

Fig 2: Identifying ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINALS DESCRIPTION

TERMINAL INSPECTION

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

HINT:

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

Fig 3: Identifying Skid Control ECU Terminals

VOLTAGE SPECIFICATION

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
A24-2 (+BM1) - Body ground	B	Power supply for motor (from battery)	Always	11 to 14 V
A24-16 (STPO) - Body ground	R-Y	Stop light operation relay	Engine switch off → on (IG)	Below 1 V → 11 to 14V
A24-28 (PKB) - Body ground	Y-R	Parking brake input	Parking brake switch on → off (Parking brake lever pulled → released)	Below 1 Ω → 10 kΩ or higher
A24-31 (+BS) - Body ground	W	Power supply for solenoid (from battery)	Always	11 to 14 V
A24-41 (LBL) - Body ground	BR-Y	Brake fluid level warning switch	Brake fluid level +/-5 mm (+/-0 197 in.) from the minimum level → maximum level	Below 1 Ω → 1.9 to 2.1 kΩ
A24-43 (CSW) - Body ground	G-W	VSC OFF switch input	VSC OFF switch off → on	10 kΩ or higher → Below 1 Ω
A24-45 (STP2) - Body ground	R	Stop light switch	Stop light switch on → off (Brake pedal depressed → released)	8 to 14 V → Below 1.5V
A24-46 (IG1) - Body ground	G	IG1 power supply	Engine switch off → on (IG)	Below 1V → 11 to 14V
A25-1 (IG2) - Body ground	B	IG2 power supply	Engine switch off → on (IG)	Below 1 V → 11 to 14V
A25-2 (+BM2) - Body ground	B	Power supply for motor (from battery)	Always	11 to 14 V
A24-1 (GND1) - Body ground	W-B	Ground	Always	Below 1 Ω
A24-32 (GND2) - Body ground	W-B	Ground	Always	Below 1 Ω
A25-4 (GND3) - Body ground	W-B	Ground	Always	Below 1 Ω