Mazda 6 Service Manual: Dsc hu/cm inspection

1. Remove the battery and battery bracket.

2. Disconnect the DSC HU/CM connector.

3. Connect the SST

(49 G066 004) to the DSC HU/CM connector and harness side connector.

4. Inspect voltage referring the table below.

Terminal Voltage Table (reference value)

(Ignition switch is at ON, and connector is connected unless indicated otherwise.)

* : Used for vehicle manufacturing, not used for DSC.

Inspection Using An Oscilloscope (Reference)

Steering angle (steering angle signal 1 and 2)

• DSC HU/CM terminal:

Steering angle signal 2 : W ( + ) - R ( - )

Steering angle signal 1 : X ( + ) - R ( - )

• Oscilloscope setting:

1 V/DIV (Y), 25 ms/DIV (X), DC range

• Vehicle condition: Rotating steering wheel at one revolution per second

Note

• As steering wheel rotation speed increases, period of wave shortens.

• As for shape of steering angle signals 1 and 2, the phase is different.

Wheel speed

• DSC HU/CM terminal:

RF : M ( + ) - I ( - )

RR : K ( + ) - H ( - )

LF : F ( + ) - J ( - )

LR : Q ( + ) - N ( - )

• Oscilloscope setting:

1 V/DIV (Y), 2 ms/DIV (X), AC range

• Vehicle condition: Driving 30 km/h (18.6 mph)

Note

• As vehicle speed increases, period of wave shortens.

• If there is malfunctioning in the sensor rotor, wave profile warps.

Vehicle speed output

• DSC HU/CM terminal: AE ( + ) - A( - )

• Oscilloscope setting:

1 V/DIV (Y), 5 ms/DIV (X), DC range

• Vehicle condition: Driving 30 km/h (18.6 mph)

Note

• As vehicle speed increases, period of wave shortens.