Sfi System Diagnosis System

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

  1. EURO-OBD (EUROPE)

  1. M-OBD (EXCEPT EUROPEAN SPEC.)

  1. NORMAL MODE AND CHECK MODE

  1. 2-TRIP DETECTION LOGIC

  1. DLC3 (Data Link Connector 3)

  1. INSPECT BATTERY VOLTAGE

  1. CHECK MIL

  1. ALL READINESS

Sfi System -- Diagnosis System



EURO-OBD (EUROPE)
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.
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:
Lexus Gs430, Gs300. Uzs190 Grs190

  1. The emission control system/components

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



    3. Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System.Sfi System Diagnosis System

  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.
    To check DTCs, connect the intelligent tester to the Data Link Connector3 (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 (Click here).


M-OBD (EXCEPT EUROPEAN SPEC.)
When troubleshooting Multiplex On-Board Diagnostic (M-OBD) vehicle, the vehicle must be connected to the intelligent tester. Various data output from the ECM can then be read.
OBD regulations require that the vehicle's on-board computer illuminates the MIL on the instrument panel when the computer detects a malfunction in:
Lexus Gs430, Gs300. Uzs190 Grs190

  1. The emission control system/components

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

  3. The computer
    In addition, the applicable DTCs are recorded in the ECM memory. If the malfunction does not recur 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 detected malfunctions, including intermittent malfunctions (intelligent tester only).

2-TRIP DETECTION LOGIC
When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected again after the engine switch is turned off and then on (IG), the MIL will illuminate.
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System.Sfi System Diagnosis System

DLC3 (Data Link Connector 3)
The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 15765-4 format.
HINT:
Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.

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
1Ω or less
Always
SG
5
Signal ground
Body ground
1Ω or less
Always
BAT
16
Battery positive
Body ground
9 to 14 V
Always
CANH
6
High-lever CAN bus line
CANL
54 to 69 Ω
IG switch OFF
CANH
6
High-lever CAN bus line
Body ground
1 MΩ or higher
IG switch OFF
CANH
6
High-lever CAN bus line
CG
1 kΩ or higher
IG switch OFF
CANL
14
Low-lever CAN bus line
Body ground
1 MΩ or higher
IG switch OFF
CANL
14
Low-lever CAN bus line
CG
1 kΩ or higher
IG switch OFF

INSPECT BATTERY VOLTAGE
If voltage is below 11 V, replace the battery before proceeding to the next step.
Battery Voltage:
11 to 14 V

CHECK MIL

  1. Check that the MIL illuminates when turning the engine switch on (IG).
    If the MIL does not illuminate, there is a problem in the MIL circuit (refer to MIL CIRCUIT on page Click here).

  2. When the engine is started, the MIL should turn off.


ALL READINESS
For this vehicle, using the intelligent tester allows readiness codes corresponding to all DTCs read. When diagnosis (normal or malfunctioning) has complete, readiness codes are set.