Terminals Of Ecu
1. TERMINALS OF ECU
Text in Illustration *a |
Component without harness connected (Skid Control ECU) |
- |
- |
Terminal No. (Symbol) | Terminal Description |
|---|---|
A6-1 (GND1) |
Skid control ECU ground |
A6-2 (+BM1) |
Power supply for motor |
A6-3 (FR+) |
Front speed sensor RH power supply output |
A6-4 (FL-) |
Front speed sensor LH input |
A6-5 (RR+) |
Rear speed sensor RH power supply output |
A6-6 (RL-) |
Rear speed sensor LH input |
A6-7 (STP) |
Stop light switch assembly |
A6-9 (CSW) |
VSC OFF switch |
A6-11 (CANH) |
CAN communication terminal H |
A6-12 (SP1) |
Speedometer signal |
A6-13 (ATRC)*2 |
A-TRAC switch |
A6-16 (STPO) |
Stop light switch assembly |
A6-17 (FR-) |
Front speed sensor RH input |
A6-18 (FL+) |
Front speed sensor LH power supply output |
A6-19 (RR-) |
Rear speed sensor RH input |
A6-20 (RL+) |
Rear speed sensor LH power supply output |
A6-24 (TS) |
Sensor test terminal (Signal check switch) |
A6-25 (CANL) |
CAN communication terminal L |
A6-27 (EXI)*2 |
for Part-time 4WD: A.D.D. detection switch for Full-time 4WD: Center differential lock detection switch |
A6-31 (+BS) |
Power supply for solenoid |
A6-32 (GND2) |
Skid control ECU ground |
A6-40 (EXI3) |
w/ Rear Differential Lock: Rear differential lock detection switch w/o Rear Differential Lock*1: IG power supply w/o Rear Differential Lock*2: Front wheel drive ECU |
A6-41 (LBL) |
Brake fluid level warning switch |
A6-44 (HDCS)*3 |
Downhill assist control switch |
A6-45 (STP2) |
Stop light switch assembly |
A6-46 (IG1) |
IG1 power supply |
A7-1 (IG2) |
IG2 power supply |
A7-2 (+BM2) |
Power supply for motor |
A7-4 (GND3) |
Skid control ECU ground |
- *1: for 2WD
- *2: for 4WD
- *3: w/ Downhill Assist Control
2. TERMINAL INSPECTION
(a) Disconnect the connector and measure the voltage or resistance on the wire harness side.
HINT:
The voltage cannot be measured with the connector connected to the skid control ECU as the connector is watertight.
Text in Illustration *a |
Front view of wire harness connector (to Skid Control ECU) |
- |
- |
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
A6-1 (GND1) - Body ground |
W-B |
Ground |
Always |
Below 1 Ω |
A6-2 (+BM1) - Body ground |
B |
Power supply for motor (from battery) |
Always |
11 to 14 V |
A6-7 (STP) - Body ground |
L |
Stop light switch assembly |
Brake pedal depressed → released |
8 to 14 V → Below 1.5 V |
A6-9 (CSW) - Body ground |
V-W |
VSC OFF switch input |
VSC OFF switch off → on and held |
10 kΩ or higher → Below 1 Ω |
A6-13 (ATRC) - Body ground*1 |
LG |
A-TRAC switch input |
A-TRAC switch off → on and held |
10 kΩ or higher → Below 1 Ω |
A6-16 (STPO) - Body ground |
LG-B |
Stop light switch assembly |
Always |
11 to 14 V |
A6-31 (+BS) - Body ground |
L-R |
Power supply for solenoid (from battery) |
Always |
11 to 14 V |
A6-32 (GND2) - Body ground |
W-B |
Ground |
Always |
Below 1 Ω |
A6-41 (LBL) - Body ground |
V-G |
Brake fluid level warning switch |
Brake fluid level +/-5 mm (+/-0.197 in.) from minimum level → maximum level |
Below 1 Ω → 1.9 to 2.1 kΩ |
A6-44 (HDCS) - Body ground*2 |
P |
Downhill assist control switch input |
Downhill assist control switch off → on |
10 kΩ or higher → Below 1 Ω |
A6-45 (STP2) - Body ground |
V-G |
Stop light switch assembly |
Brake pedal depressed → released |
8 to 14 V → Below 1.5 V |
A6-46 (IG1) - Body ground |
G |
IG1 power supply |
Ignition switch off → ON |
Below 1 V → 11 to 14 V |
A7-1 (IG2) - Body ground |
W |
IG2 power supply |
Ignition switch off → ON |
Below 1 V → 11 to 14 V |
A7-2 (+BM2) - Body ground |
B |
Power supply for motor (from battery) |
Always |
11 to 14 V |
A7-4 (GND3) - Body ground |
W-B |
Ground |
Always |
Below 1 Ω |
- *1: for 4WD
- *2: w/ Downhill Assist Control
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.