Anti-Lock Brake System Diagnosis System

Brake. Camry. Acv40 Gsv40
Brake Control. Camry. Acv40 Gsv40

  1. DIAGNOSIS SYSTEM

  1. DIAGNOSIS

  1. WARNING LIGHT INITIAL CHECK

  1. SYMPTOM SIMULATION

Anti-Lock Brake System -- Diagnosis System



DIAGNOSIS SYSTEM

  1. Inspect the battery voltage.

    Standard voltage:
    11 to 14 V
    If the voltage is below 11 V, recharge the battery before proceeding.


    2. Camry. Acv40 Gsv40.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Diagnosis System

  2. The vehicle's ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.

    Symbols (Terminal No.)
    		Terminal Description
    		Condition
    		Specified Condition
    CG (4) - Body ground
    		Chassis ground
    		Always
    		Below 1 Ω
    SG (5) - Body ground
    		Signal ground
    		Always
    		Below 1 Ω
    BAT (16) - Body ground
    		Battery positive
    		Always
    		9 to 14 V
    CANH (6) - CANL (14)
    		CAN bus line
    		Ignition switch OFF*
    		54 to 69 Ω
    CANH (6) - Battery positive
    		HIGH-level CAN bus line
    		Ignition switch OFF*
    		6 kΩ or higher
    CANH (6) - CG (4)
    		HIGH-level CAN bus line
    		Ignition switch OFF*
    		200 Ω or higher
    CANL (14) - Battery positive
    		LOW-level CAN bus line
    		Ignition switch OFF*
    		6 kΩ or higher
    CANL (14) - CG (4)
    		LOW-level CAN bus line
    		Ignition switch OFF*
    		200 Ω or higher
    HINT:
    Connect the cable of the intelligent tester to the DLC3, turn the ignition switch to the ON position and attempt to use the intelligent tester. If the screen displays a communication error message, a problem exists on either the vehicle side or the tester side.
    If the communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
    If the communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.
    NOTICE:
    *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

DIAGNOSIS
NOTICE:
When releasing the parking brake, set chocks to hold the vehicle for safety.


    Camry. Acv40 Gsv40

  1. Release the parking brake.

  2. Turn the ignition switch to the ON position.

  3. If the skid control ECU detects a malfunction, the ABS warning light and brake warning light will come on to warn the driver. The table below indicates which light will come on when there is a malfunction in a particular function.

    Item/Trouble Area
    		ABS System
    		EBD System
    		Skid Control ECU
    ABS Warning light
    		○
    		○
    		○
    Brake Warning light
    		-
    		○
    		○
    ○: Light ON
    -: Light OFF
    1. The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting the SST (09843-18040) between the TC and CG terminals of the DLC3 and observing the blinking pattern of the ABS warning light, or by connecting an intelligent tester (CAMRY_ACV40 RM000001JB800HX.html).
    2. This system has a sensor signal check function (CAMRY_ACV40 RM000001JBD011X.html).

WARNING LIGHT INITIAL CHECK
NOTICE:
When releasing the parking brake, set chocks to hold the vehicle for safety.
HINT:
When the parking brake is applied or the level of the brake fluid is low, the brake warning light comes on.


    Camry. Acv40 Gsv40

  1. Release the parking brake.

  2. Check that the ABS warning light and brake warning light come on when the ignition switch is turned to the ON position and go off in approximately 3 seconds.

  3. If the warning lights do not come on or remain on, inspect the ABS warning light circuit and/or brake warning light circuit.

    Trouble Area
    		See procedure
    ABS warning light circuit (Remains on)
    		CAMRY_ACV40 RM000001JD300IX.html
    ABS warning light circuit (Does not come on)
    		CAMRY_ACV40 RM000001JD400IX.html
    Brake warning light circuit (Remains on)
    		CAMRY_ACV40 RM000001JD800GX.html
    Brake warning light circuit (Does not come on)
    		CAMRY_ACV40 RM000001JDC00GX.html

SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be reproduced. No matter how experienced or skilled a technician may be, if he proceeds to troubleshoot without confirming the problem symptoms, he will likely overlook something important and make a wrong guess at some points in the repair operation. This leads to a standstill in troubleshooting.


    Camry. Acv40 Gsv40.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Diagnosis System

  1. Vibration method: When vibration seems to be the major cause.

    HINT:
    Perform the simulation method only during the primary check period (for approximately 6 seconds after the ignition switch is turned to the ON position).

    1. Slightly vibrate the part of the sensor considered to be the problem cause with your fingers and check whether the malfunction occurs.

    2. Slightly shake the connector vertically and horizontally.

      HINT:
      Shaking the relays too strongly may result in open relays.

    3. Slightly shake the wire harness vertically and horizontally. The connector joint and fulcrum of the vibration are the major areas to be checked thoroughly.