Diagnosis System

1. When troubleshooting OBD II (On-Board Diagnostics) vehicles, a intelligent tester (complying with SAE J1987) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle's ECM (Engine Control Module) can be then read.
2. OBD II regulations require that the vehicle's onboard computer illuminates the MIL (Malfunction Indicator Lamp) on the instrument panel when the computer detects a malfunction in:
   1. The emission control systems and components
   2. The power train control components (which affect vehicle emissions)
   3. The computer itself

      In addition, the applicable DTCs (Diagnostic Trouble Codes) prescribed by SAE J2012 are recorded on 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.

      Fig 1: Identifying MIL (Malfunction Indicator Lamp)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. To check DTCs, connect an intelligent tester to the DLC3. The tester displays DTCs, freeze frame data, and a variety of engine data. The DTCs and freeze frame data can be erased with the tester (See DTC CHECK / CLEAR ).
   Fig 2: Connecting Intelligent Tester To DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   In order to enhance OBD function on vehicles and develop the Off-Board diagnosis system, CAN communication is introduced in this system (CAN: Controller Area Network). It minimizes a gap between technician skills and vehicle technology. CAN is a network, which uses a pair of data transmission lines, spanning multiple computers and sensors. It allows a high speed communication between the systems and to simplify the wire harness connection.

   Fig 3: Identifying DLC3 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Since this system is equipped with the CAN communication, connecting the CAN VIM (VIM: Vehicle Interface Module) with an intelligent tester is necessary to display any information from the ECM. (Also the communication between the intelligent tester and the ECM uses CAN communication signal.) When confirming the DTCs and any data of the ECM, connect the CAN VIM between the DLC3 and the intelligent tester.

1. 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 as an option for technicians. In check mode, 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent problems (intelligent tester only) (See DTC CHECK / CLEAR ).

1. When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected during the next subsequent drive cycle, the MIL is illuminated (2nd trip).

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.

1. The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
   Fig 4: Identifying DLC3 Data Link Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   SYMBOLS AND TERMINAL NO. REFERENCE
   
   

   Symbols	Terminal No.	Names	Reference terminals	Results	Conditions
   SIL	7	Bus "+" line	5 - Signal ground	Pulse generation	During transmission
   CG	4	Chassis ground	Body ground	1 or less	Always
   SG	5	Signal ground	Body ground	1 or less	Always
   BAT	16	Battery positive	Body ground	9 to 14 V	Always
   CANH	6	CAN "High" line	14 - CANL	54 to 69	Ignition switch off
   CANH	6	CAN "High" line	Battery positive	1 M or higher	Ignition switch off
   CANH	6	CAN "High" line	4 - CG	1 k or higher	Ignition switch off
   CANL	14	CAN "Low" line	Battery positive	1 M or higher	Ignition switch off
   CANL	14	CAN "Low" line	4 - CG	1 k or higher	Ignition switch off

   HINT:

   The DLC3 is the interface prepared for reading various data from the vehicle's ECM. After connecting the cable of an intelligent tester, turn the ignition switch on (IG) and turn the tester ON.

   • If a communication failure message is displayed on the tester screen (on the tester: UNABLE TO CONNECT TO VEHICLE), a problem exists in either the vehicle or tester. In order to identify the location of the problem, connect the tester to another vehicle.
   • If communication is normal: Inspect the DLC3 on the original vehicle.
   • If communication is impossible: The problem is probably with the tester itself. Consult the Service Department listed in the instruction manual.

Battery Voltage: 

11 to 14 V 

If the voltage is below 11 V, recharge the battery before proceeding.

1. The MIL is illuminated when the ignition switch is first turned on (IG) (the engine is not running).
2. The MIL should turn off when the engine is started. If the MIL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system.

   HINT:

   If the MIL is not illuminated when the ignition switch is first turned on (IG), check the MIL circuit (See MIL CIRCUIT ).