Automatic Transaxle System Diagnosis System

Transmission. Camry. Acv40 Gsv40
U250E Automatic Transaxle. Camry. Acv40 Gsv40

  1. EURO-OBD

  1. M-OBD (EXCEPT EUROPEAN SPEC.)

  1. NORMAL MODE AND CHECK MODE

  1. 2-TRIP DETECTION LOGIC

  1. FREEZE FRAME DATA

  1. INSPECT THE DLC3

  1. CHECK BATTERY VOLTAGE

  1. CHECK MIL

Automatic Transaxle System -- Diagnosis System



EURO-OBD

  1. When troubleshooting Europe On-Board Diagnostic (Euro-OBD) vehicles, the vehicle must be connected to an OBD scan tool (complying with ISO 15765-4). Various data output from the vehicle's ECM can then be read.



    2. Camry. Acv40 Gsv40

  2. Euro-OBD regulations require that the vehicle's on-board computer illuminates the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in:

    1. The emission control system/components.

    2. The power train control components (which affect vehicle emissions).

    3. The computer.
      In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by ISO 15765-4 are recorded in the ECM memory.
      If the malfunction does not reoccur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.



    3. Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System.Automatic Transaxle System Diagnosis System
    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System.Automatic Transaxle System Diagnosis System

  3. To check DTCs, connect the intelligent tester or OBD scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The scan tool displays DTCs, the freeze frame data and a variety of the engine data.
    The DTCs and freeze frame data can be erased with the scan tool (CAMRY_ACV40 RM000000W710GRX.html).


M-OBD (EXCEPT EUROPEAN SPEC.)

  1. When troubleshooting Multiplex On-Board Diagnostic (M-OBD) vehicles, the vehicle must be connected to the intelligent tester. Various data output from the ECM can then be read.



    2. Camry. Acv40 Gsv40

  2. OBD regulations require that the vehicle's on-board computer illuminates the MIL on the instrument panel when the computer detects a malfunction in:

    1. The emission control system/components.

    2. The power train control components (which affect vehicle emissions).

    3. The computer.
      In addition to, the applicable DTCs are recorded in the ECM memory.
      If the malfunction does not reoccur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.


NORMAL MODE AND CHECK MODE
The diagnosis system operates in "normal mode" during normal vehicle use. In normal mode, "2 trip detection logic" is used to ensure accurate detection of malfunctions. "Check mode" is also available to technicians as an option. In check mode, "1-trip detection logic" is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions (intelligent tester only).

2-TRIP DETECTION LOGIC

  1. When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the engine switch is turned off and then turned on again, and the same malfunction is detected again, the MIL will illuminate.


FREEZE FRAME DATA

  1. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.



    2. Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System.Automatic Transaxle System Diagnosis System

  2. The intelligent tester displays freeze frame data recorded at five different points: 1) 3 times before the DTC is set, 2) once when the DTC is set, and 3) once after the DTC is set. The data can be used to simulate the vehicle's condition around the time of the malfunction. The data may be helpful in determining the cause of a malfunction. It may also be helpful in determining whether a DTC is being caused by a temporary malfunction.


INSPECT THE DLC3


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System.Automatic Transaxle System Diagnosis System

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

    Terminals of DLC 3:

    Symbol
    		Terminal No.
    		Name
    		Reference Terminal
    		Result
    		Condition
    SIL
    		7
    		Bus "+" line
    		5 - Signal ground
    		Pulse generation
    		During transmission
    CG
    		4
    		Chassis ground
    		Body ground
    		Below 1 Ω
    		Always
    SG
    		5
    		Signal ground
    		Body ground
    		Below 1 Ω
    		Always
    BAT
    		16
    		Battery positive
    		Body ground
    		11 to 14 V
    		Always
    CANH
    		6
    		 CAN bus line
    		CANL
    		54 to 69 Ω
    		IG switch OFF*
    CANH
    		6
    		HIGH-level CAN bus line
    		Battery positive
    		6 kΩ or higher
    		IG switch OFF*
    CANH
    		6
    		HIGH-level CAN bus lineCG
    		CG
    		200 Ω or higher
    		IG switch OFF*
    CANL
    		14
    		LOW-level CAN bus line
    		Battery positive
    		6 kΩ or higher
    		IG switch OFF*
    CANL
    		14
    		LOW-level CAN bus line
    		CG
    		200 Ω or higher
    		IG switch OFF*
    CAUTION:
    *: 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.
    If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
    HINT:
    Connect the cable of the intelligent tester to the DLC3, turn the ignition switch to the ON and attempt to use the intelligent tester. If the screen displays a communication error message, a problem exists in the vehicle side or the tester side.
    1. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
    2. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.

CHECK BATTERY VOLTAGE

  1. Measure the battery voltage.

    Battery voltage:
    11 to 14 V
    If voltage is below 11 V, replace the battery before proceeding.

CHECK MIL

  1. Check that the MIL illuminates when turning the ignition switch to the ON position.

    HINT:
    If the MIL does not light up, troubleshoot the combination meter.

  2. When the engine is started, the MIL should go off. If the lamp remains on, it means that the diagnosis system has detected a malfunction or abnormality in the system.