Electronic Power Steering System Diagnosis System

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Power Steering. Lexus Gs430, Gs300. Uzs190 Grs190

  1. DESCRIPTION

  1. CHECK DLC3

  1. P/S WARNING LIGHT

Electronic Power Steering System -- Diagnosis System



DESCRIPTION

  1. Connecting the intelligent tester to the vehicle and reading various data output from the power steering ECU assembly is the only difference between usual troubleshooting procedures and those for a vehicle with a diagnostic system.
    The power steering ECU assembly records DTCs when the ECU detects a malfunction in the computer itself or in its circuits.
    To check the DTCs, connect the intelligent tester to the DLC3. The intelligent tester enables you to erase the DTCs and check the freeze frame data and various forms of steering data.


CHECK DLC3


    Lexus Gs430, Gs300. Uzs190 Grs190.Power Steering.Power Steering System.Electronic Power Steering System Diagnosis System

  1. Check the DLC3.
    The power steering ECU assembly uses CAN and ISO 9141-2 (Euro-OBD) as its communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 9141-2 format.

    Symbols (Terminal No.)
    		Terminal Description
    		Condition
    		Specified Condition
    SIL (7) - SG (5)
    		Bus "+" line
    		During communication
    		Pulse generation
    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
    		11 to 14 V
    CANH (6) - CANL (14)
    		HIGH-level CAN bus line
    		Engine switch off
    		54 to 67 Ω
    CANH (6) - Battery positive
    		HIGH-level CAN bus line
    		Engine switch off
    		1 MΩ or higher
    CANH (6) - CG (4)
    		HIGH-level CAN bus line
    		Engine switch off
    		3 kΩ or higher
    CANL (14) - Battery positive
    		LOW-level CAN bus line
    		Engine switch off
    		1 MΩ or higher
    CANL (14) - CG (4)
    		LOW-level CAN bus line
    		Engine switch off
    		3 kΩ or higher
    HINT:
    Connect the intelligent tester cable to the DLC3, turn the engine switch on (IG), and attempt to use the tester. If the screen displays a communication error message, a problem exists on the vehicle side or the tester side.
    1. If communication is normal when connecting the tester to another vehicle, inspect the DLC3 on the original vehicle.
    2. If communication is still not possible when connecting the tester to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's operator's manual.

P/S WARNING LIGHT

  1. If a problem occurs in the electronic power steering system, the P/S warning light will come on in the combination meter.