TERMINALS OF ECU
1. TERMINALS OF ECU
Text in Illustration
*a |
Component without harness connected (Skid Control ECU (Master Cylinder Solenoid)) |
- |
- |
Terminal No. (Symbol) |
Terminal Description |
---|---|
S1-1 (GND1) |
Ground |
S1-2 (+BM1) |
Power supply for motor |
S1-3 (FR+) |
Front wheel speed sensor RH power supply output |
S1-4 (FL-) |
Front wheel speed LH signal input |
S1-5 (RR+) |
Rear wheel speed sensor RH power supply output |
S1-6 (RL-) |
Rear wheel speed LH signal input |
S1-7 (STP) |
Stop light switch input |
S1-9 (CSW) |
VSC OFF switch input |
S1-11 (CANH) |
CAN communication line H |
S1-12 (SP1) |
Speed signal output for speedometer |
S1-13 (TRM3) |
A-TRAC switch input*1 CRAWL speed selector switch*2 |
S1-16 (STPO) |
Stop light operated relay output |
S1-17 (FR-) |
Front wheel speed sensor RH input |
S1-18 (FL+) |
Front wheel speed sensor LH power supply output |
S1-19 (RR-) |
Rear wheel speed sensor RH input |
S1-20 (RL+) |
Rear wheel speed sensor LH power supply output |
S1-21 (TRM2) |
CRAWL speed selector switch*2 |
S1-25 (CANL) |
CAN communication line L |
S1-27 (EXI) |
L4 detection switch input |
S1-28 (PKB) |
MTS SET switch input |
S1-29 (EXI4) |
4WD detection switch input |
S1-31 (+BS) |
Power supply for solenoid |
S1-32 (GND2) |
Ground |
S1-41 (LBL) |
Brake fluid level warning switch input |
S1-43 (TRS) |
CRAWL ON/OFF switch*2 |
S1-44 (TRM1) |
CRAWL speed selector switch*2 |
S1-45 (STP2) |
Stop light switch input |
S1-46 (IG1) |
IG1 power supply |
S2-1 (IG2) |
IG2 power supply |
S2-2 (+BM2) |
Power supply for motor |
S2-4 (GND3) |
Ground |
2. 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 (master cylinder solenoid) as the connector is water resistant.
Text in Illustration
*a |
Front view of wire harness connector (Skid Control ECU (Master Cylinder Solenoid)) |
- |
- |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
S1-1 (GND1) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
S1-2 (+BM1) - Body ground |
B - Body ground |
Power supply for motor from battery |
Always |
11 to 14 V |
S1-7 (STP) - Body ground |
SB - Body ground |
Stop light switch input |
Stop light switch off (Brake pedal released) |
Below 1.5 V |
Stop light switch on (Brake pedal depressed) |
8 to 14 V |
|||
S1-9 (CSW) - Body ground |
GR - Body ground |
VSC OFF switch input |
VSC OFF switch off |
10 kΩ or higher |
VSC OFF switch on and hold |
Below 1 Ω |
|||
S1-16 (STPO) - Body ground |
B - Body ground |
Stop light operated relay output |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
|||
S1-31 (+BS) - Body ground |
R - Body ground |
Power supply for solenoid from battery |
Always |
11 to 14 V |
S1-32 (GND2) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
S1-41 (LBL) - Body ground |
V - Body ground |
Brake fluid level warning switch input |
Brake fluid level min. -5 mm |
Below 1 Ω |
Brake fluid level max. |
1.9 to 2.1 kΩ |
|||
S1-45 (STP2) - Body ground |
L - Body ground |
Stop light switch input |
Stop light switch off (Brake pedal released) |
Below 1.5 V |
Stop light switch on (Brake pedal depressed) |
8 to 14 V |
|||
S1-46 (IG1) - Body ground |
G - Body ground |
IG1 power supply |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
|||
S2-1 (IG2) - Body ground |
BE - Body ground |
IG2 power supply |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
|||
S2-2 (+BM2) - Body ground |
B - Body ground |
Power supply for motor from battery |
Always |
11 to 14 V |
S2-4 (GND3) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
Fail-safe Chart
FAIL-SAFE CHART
FAIL-SAFE FUNCTION
(a) When a malfunction occurs in the pre-collision system, a message will be
displayed on the multi-information display and the pre-collision system will be
disabled depending on the malfunction.
Warning Message
Cause
DTC No. ...
VSC Buzzer Circuit
DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination
meter via CAN communication.
The combination meter has a built-in VSC warning buzzer:
Sounds intermittently to inform the driver if the temperature of brake
actuator assembly has increased exce ...
Installation
INSTALLATION
PROCEDURE
1. INSTALL REAR BRAKE DRUM SUB-ASSEMBLY
(a) Install a new drum gasket onto the rear brake drum.
(b) Install the rear brake drum.
2. ADJUST REAR DRUM BRAKE SHOE CLEARANCE
(a) Provisionally install the hub nuts.
(b) Remove the hole plug, and turn the adjuster to expand ...