ABS/TCS HU/CM Inspection

ABS/TCS HU/CM INSPECTION
1. Disconnect the negative battery cable.
2. Connect the SST between the ABS/TCS HU/CM and harness connector with the ignition switch off.





3. Attach the tester leads to the SST and inspect voltage referring to the table.









Terminal Voltage Table (Reference)
(Engine is idling, and connector is connected unless otherwise indicated)

Inspection Using An Oscilloscope (Reference)





Wheel speed
^ ABS/TCS HU/CM terminal:
RR: A (+)- B
LR: C (+)-F
RF G (+)-D
LF: I (+)-E (-)
^ Oscilloscope setting: 1 V/DIV (Y), 2 ms/DIV (X), AC range
^ Vehicle condition: Driving 30 km/h (118.6 mph)

Note:
^ As vehicle speed increases, the wave period shortens.
^ If there is malfunctioning in the sensor rotor, the wave profile warps.

Vehicle speed output





^ ABS/TCS HU/CM terminal: V (+)-AC
^ Oscilloscope setting: 1 V/DIV (Y), 5 ms/DIV (X), DC range
^ Vehicle condition: Driving 30 km/h (118.6 mph)

Note: As vehicle speed increases, the wave period shortens.