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Mazda CX-5 Service & Repair Manual: Electric Power Steering (Eps) Control Module

Mazda CX-5 Service & Repair Manual / Steering / Linkage, Power / Electric Power Steering (Eps) Control Module

Purpose/ Function

Function Table


Control item

Function

EPS motor current control

  • Normal control

    • Calculates the proper assist current based on the steering torque, and the vehicle and engine speeds, and outputs a target current to the EPS motor.

  • System overheating protection control

    • Monitors the temperature of the motherboard in the EPS CM and controls the motor voltage gradually to prevent overheating of the system.

  • Backup control

    • Even if a phase 1 open circuit malfunction in the EPS motor occurs, output current to the EPS motor is controlled so that steering assist is maintained.

On-board diagnostic function

  • The main part of the system control includes the self-diagnosis function. In case a malfunction occurs, the power steering malfunction indicator light/master warning light illuminates to alert the driver, and a DTC is stored in the EPS CM at the same time.

  • As a result of the on-board diagnosis, when a malfunction is determined, system control is suspended or limited to assure safety while driving.

CAN communication function

  • Outputs the EPS status signal and power steering malfunction indicator light illuminates on request via CAN lines.

Automatic configuration function

  • When the ignition is switched to ON or the engine is started after the EPS CM have been replaced, the EPS CM reads data from the instrument cluster via CAN communication to perform automatic configuration.

Steering wheel angle neutral position automatic learning function

  • When the ignition is switched from OFF to ON and the vehicle is driven normally, the steering wheel angle neutral position is detected automatically based on the signal from the torque sensor.


Block Diagram


NOTE:

Construction

Operation

EPS Motor Current Control

Fail-safe


DTC No.

Fail-safe function

U2300:54

  • Control enabled

  • Power steering malfunction indicator light: Not illuminated

U2300:55

  • Control enabled

  • Power steering malfunction indicator light: Illuminated

U2300:56

  • Control enabled

  • Power steering malfunction indicator light: Not illuminated

U3000:16

  • Control disabled

  • Power steering malfunction indicator light: Illuminated

U3000:1C

U3000:28

U3000:41

U3000:46

  • Control is maintained in fail mode

  • Power steering malfunction indicator light: Not illuminated

U3000:47

  • Control disabled

  • Power steering malfunction indicator light: Illuminated

U3000:49

U3000:4B

  • Control is maintained in fail mode

  • Power steering malfunction indicator light: Not illuminated

U3000:61

  • Control disabled

  • Power steering malfunction indicator light: Illuminated

U3000:73

U3000:96

U3003:16

  • Control is maintained by gradually decreasing the motor control current

    • However, control is inhibited if the power supply voltage is the specified value of less

  • Power steering malfunction indicator light: Illuminated

U3003:17

  • Control disabled

  • Power steering malfunction indicator light: Illuminated


Linkage, Power
...

Electric Power Steering (Eps) Motor
Purpose, Function The EPS motor is driven by the control current from the EPS CM (control module) and generates assist torque to manual steering mechanism. Construction The EPS ...

Other materials:

Camshaft Position (CMP) Sensor
Purpose/Function Detects the camshaft speed as basic information for mainly determining the fuel injection timing and ignition timing. Detects the camshaft speed and inputs it to the PCM as a CMP signal. Construction Intake CMP sensor Installed on the cylinder head. ...

Thermostat
Purpose, Function When the engine coolant temperature is low, the thermostat blocks the engine coolant passage between the radiator and engine. As a result, because engine coolant cycles without passing through the radiator, warming is promoted. Construction The thermostat ...

Antilock Brake System (ABS)
The ABS control unit continuously monitors the speed of each wheel. If one wheel is about to lock up, the ABS responds by automatically releasing and reapplying that wheel's brake. The driver will feel a slight vibration in the brake pedal and may hear a chattering noise from the brake sy ...

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