Driveline/Axle
Components
• Electronic control coupling (4WD solenoid):
– Based on a signal from the 4WD CM, it operates the electromagnetic clutch and
transmits drive torque to the rear wheels.
• Differential oil temperature sensor:
– Informs the 4WD CM of the rear differential oil temperature.
• 4WD CM:
– Controls operation of the electronic control coupling (4WD solenoid) mainly based on
signals indicating accelerator pedal position, wheel speed and differential oil
temperature.
– Outputs coupling control condition and 4WD warning control information as a CAN
signal.
– Controls the on-board diagnostic system and the fail-safe system if there is a
malfunction in the 4WD system.
• 4WD warning light:
– Illuminates or flashes to alert the driver of a malfunction or control failure in the 4WD
system.
• PCM:
– Provides data about accelerator pedal position, engine speed and transaxle neutral
position on the CAN data bus available for the 4WD CM.
• DSC HU/CM (Dynamic Stability Control Hydraulic Unit/Control Module):
– Provides data about four-wheel speed, DSC operating condition, steering wheel
angle and the coupling torque request signal on the CAN data bus available for the
4WD CM.
Service Training Mazda6 MPS Supplement 03-17
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