Brake Control System for Your Toyota Alphard Van First Generation (2002-2008)

Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Brake Control System  
Speed Sensor  
– Speed sensor type has been changed from passive  
type to active type  
Active Type  
(Semiconductor)  
Passive Type  
(Magnetic pick-up)  
Coil  
Magnetic  
Rotor  
Rotor  
MRE  
Yoke  
Magnet  
New ALPHARD  
Previous ALPHARD  
49  
Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Brake Control System  
Speed Sensor  
– MRE internal operation  
Constant Voltage Circuit  
+B  
Magnetic  
Rotor  
2
MRE  
Output  
Output  
1
4
+
-
2
4
MRE  
1
0
Comparator  
Output  
3
12V  
0V  
Output  
Comparator  
50  
Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Brake Control System  
Speed Sensor  
– Sensor output  
FL+  
Power supply (12V)  
MRE  
FL-  
51  
Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Brake Control System  
Speed Sensor  
– Signal output at extremely low speed rotation can be  
ensured  
Active Type  
(Semiconductor)  
Passive Type  
(Magnetic pick-up)  
No Detecting  
Time  
Time  
52  
Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Service Point (Brake Control System)  
Speed Sensor  
– Inspection procedure  
Skid Control ECU  
FL+  
12V  
FL- to GND  
MRE  
1.4V  
0.7V  
FL-  
100  
GND  
Low Speed  
High Speed  
53  
Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Brake Control System  
Cooperative Control with EPS  
– In addition to the conventional VSC system,  
cooperative control with EPS is newly added to  
improve the vehicle posture control  
V Bus  
No.1  
Combination  
Meter  
ECM  
Skid Control  
ECU  
Main Body  
ECU  
Brake  
Brake Actuator  
Cooperative Control with EPS  
Steering  
Angle Sensor  
Controls  
Assist Force  
Power  
Steering ECU  
Yaw Rate and  
Acceleration Sensor  
54  
Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Brake Control System  
Cooperative Control with EPS  
– EPS assist force is controlled to help driver handling  
during VSC system operation  
When road surface resistance differs  
between both sides of wheels  
[Rear Wheel Skid Tendency]  
Increase  
Assist  
Power  
Increase  
Assist Power  
[Front Wheel Skid Tendency]  
Low High   
Low High   
Reduce  
Assist Power  
[Braking Suddenly] [Accelerating Suddenly]  
55  
Model Outline  
for Technician  
Engine  
Chassis  
Body  
Body Electrical  
Service Point (Brake Control System)  
Inspection Mode  
– Inspection mode turns off the TRC and VSC systems  
completely  
within 30 seconds  
within 15 seconds  
• Engine  
switch OFF  
• P Range  
• PKB ON  
Brake  
KB  
Brake  
Brake  
Depress  
twice  
ON  
Start  
engine  
Depress  
twice  
KB  
VSC  
and  
TRC  
OFF  
Release  
and apply  
twice  
Change to an engine switch OFF Inspection mode is canceled  
56  

Related Topics

Speed Sensor
Cooperative Control with EPS
Service Point (Inspection Mode)

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