Driveline/Axle
4WD Control Module
• The 4WD CM calculates the optimal amount of torque distribution for the rear wheels
and sends a corresponding electric current to the electronic control coupling (4WD
solenoid). This calculation is mainly based on the accelerator pedal position, four-wheel
speed, engine speed and transaxle neutral position, matched with the vehicle driving and
road surface conditions.
M6-MPS_03019
1
4WD control module
2
PCM
Operation
• 4WD system control function:
– Based on each input signal, the electronic control current sent to the electronic
control coupling (4WD solenoid) is optimally controlled.
• Diagnostic system:
– If the self-diagnostic system detects a malfunction, the 4WD warning light illuminates
to alert the driver, and at the same time the system suspends control to prevent a
loss of driving stability and protect the system.
– The detected malfunction is stored as a DTC in the 4WD CM.
Service Training Mazda6 MPS Supplement 03-23
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