Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK 4WD ECU ASSEMBLY
(a) Measure the voltage and resistance of the connector.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G131-6 (CANH) - G131-5 (CANL) | G - W | HIGH-level CAN bus wire - LOW-level CAN bus wire | Cable disconnected from negative (-) battery terminal | 54 to 69 Ω |
| G131-4 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| G131-3 (IG1) - G131-4 (GND) | BE - W-B | Power source voltage | Engine switch on (IG) | 11 to 14 V |
| G131-2 (SLC+) - G131-1 (SLC-) | W - B | 4WD linear solenoid signal | D position, engine idling | Pulse generation (See waveform 1) |
If the result is not as specified, the 4WD ECU assembly may have a malfunction.
(b) Using an oscilloscope, check the waveform 1.
Waveform 1 (Reference)| Item | Content |
|---|---|
| Terminal No. (Symbol) | G131-2 (SLC+) - G131-1 (SLC-) |
| Tester Range | 2 V/DIV., 1 msec./DIV. |
| Condition | D position, engine idling |
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Control Module Communication Bus Off (U0073,U0100,U0126,U0129)
DESCRIPTION The 4WD ECU assembly inputs the signals sent from the ECM, skid control ECU (brake actuator assembly) and steering sensor via CAN communication. When DTCs indicating a CAN communication sy
Components
COMPONENTS ILLUSTRATION *1 PROPELLER SHAFT HEAT INSULATOR *2 NO. 1 PROPELLER SHAFT HEAT INSULATOR BRACKET SUB-ASSEMBLY *3 REAR ENGINE MOUNTING BRACKET SUB-ASSEMBLY *4 TRANSFER ASSE
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Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE 1. REMOVE REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY WITH REAR DOOR UPPER ARMREST BASE PANEL Click here 2. REMOVE REAR DOOR TRIM UPPER PAD Clic
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS (a) Interview the customer and confirm the problem. Click here
NEXT 3. INSPECT AUXILIARY BATTERY VOLTAGE Stan
