Can Communication System Fail-Safe Chart

Communication System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Can Communication. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. FAIL-SAFE FUNCTION

Can Communication System -- Fail-Safe Chart



FAIL-SAFE FUNCTION

  1. When communication fails in any of the main wires (communication lines) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning.

  2. The table below shows the effects on each system when communication is impossible. For further details, refer to each system.

    Function
    		ECM
    		ABS and Traction Actuator (Skid Control ECU)
    		Brake Actuator (Skid Control ECU)
    		Yaw Rate Sensor
    		Steering Angle Sensor
    		4WD Control ECU
    		Condition when communication impossible
    		DTC detection (Driver detectable)
    Navi-CVT cooperative control (appropriate gear change control according to curve, incline, or driver's instructions)
    		●





    		Cooperative control cancellation
    		None (Brakes are not as effective when entering curves)
    Normal cruise control (Maintains vehicle speed)
    		●
    		○




    		Normal cruise function stops
    		Detectable (Light comes on)
    Neutral control
    		●
    		○
    		○



    		Neutral control function stops
    		None
    Air conditioning control (Vehicle interior A/C control)
    		○





    		Air conditioning function stops
    		None (Air conditioning inoperative)
    VSC control (Controls driving force while VSC in operation)
    		○
    		●

    		○
    		○

    		Control inoperative (gradually stops controlling during VSC control)
    		Detectable (Light comes on)
    TRC control (Controls driving force and engine power when wheel slip detected during acceleration)
    		○
    		●




    		Control inoperative (gradually stops controlling during TRC control)
    		Detectable (Light comes on)
    ABS control (Controls driving force while ABS in operation)
    		○
    		●
    		●



    		Control is inoperative (gradually stops controlling during ABS control)
    		Detectable (Light comes on)
    4WD control (Controls vehicle driving power distribution to front and rear wheels according to driving conditions)
    		○
    		○
    		○

    		○
    		●
    		4WD control function stops (same as 2WD)
    		Detectable (Light comes on)
    Electric power steering control (Vehicle speed response type torque control)
    		○
    		○




    		EPS assist function canceled or reduced (steering wheel becomes harder to turn)
    		When VSC is abnormal
    (Light comes on)
    When engine is abnormal
    (Function canceled / Recognizable by decrease in steering power assist)
    Entry lock function*






    		May become unable to unlock doors with lock entry function
    		Detectable (Buzzer sounds)
    Immobiliser control* (Warning control, remote engine start control)
    		○





    		Unable to start engine with remote engine starter
    		None (Recognizable by condition shown on left)
    Meter display (Vehicle condition display, indicator light control)
    		○
    		○
    		○


    		○
    		Light does not come on, illuminates abnormally, or blinks abnormally
    		Detectable (Abnormal display)

    HINT:
    1. ●: Control master ECU
    2. ○: Related ECU or sensor
    3. *: w/ Entry and Start System

    Function
    		Power Steering ECU
    		Center Airbag Sensor Assembly
    		Air Conditioning Amplifier
    		Combination Meter ECU
    		Main Body ECU
    		Certification ECU
    		Condition when communication impossible
    		DTC detection (Driver detectable)
    Navi-CVT cooperative control (appropriate gear change control according to curve, incline, or driver's instructions)






    		Cooperative control cancellation
    		None (Brakes are not as effective when entering curves)
    Normal cruise control (Maintains vehicle speed)






    		Normal cruise function stops
    		Detectable (Light comes on)
    Neutral control






    		Neutral control function stops
    		None
    Air conditioning control (Vehicle interior A/C control)


    		●



    		Air conditioning function stops
    		None (Air conditioning inoperative)
    VSC control (Controls driving force while VSC in operation)






    		Control inoperative (gradually stops controlling during VSC control)
    		Detectable (Light comes on)
    TRC control (Controls driving force and engine power when wheel slip detected during acceleration)






    		Control inoperative (gradually stops controlling during TRC control)
    		Detectable (Light comes on)
    ABS control (Controls driving force while ABS in operation)






    		Control is inoperative (gradually stops controlling during ABS control)
    		Detectable (Light comes on)
    4WD control (Controls vehicle driving power distribution to front and rear wheels according to driving conditions)






    		4WD control function stops (same as 2WD)
    		Detectable (Light comes on)
    Electric power steering control (Vehicle speed response type torque control)
    		●





    		EPS assist function canceled or reduced (steering wheel becomes harder to turn)
    		When VSC is abnormal
    (Light comes on)
    When engine is abnormal
    (Function canceled / Recognizable by decrease in steering power assist)
    Entry lock function*



    		○
    		○
    		●
    		May become unable to unlock doors with lock entry function
    		Detectable (Buzzer sounds)
    Immobiliser control* (Warning control, remote engine start control)



    		○

    		●
    		Unable to start engine with remote engine starter
    		None (Recognizable by condition shown on left)
    Meter display (Vehicle condition display, indicator light control)
    		○
    		○
    		○
    		●
    		○
    		○
    		Light does not come on, illuminates abnormally, or blinks abnormally
    		Detectable (Abnormal display)
    HINT:
    1. ●: Control master ECU
    2. ○: Related ECU or sensor
    3. *: w/ Entry and Start System