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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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE:
Before performing troubleshooting, change the grille shutter control mode to maintenance mode.
Click here
If the swing grille actuator assembly has been replaced with a new one, perform initialization and change the grille shutter control mode.
Click here
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Panoramic View Monitor System DTC No. Detection Item DTC Detection Condition Link C1611 ECU Malfunction When any of the following conditions is met:
EEPROM status (Initial read) malfunction
CPU communication malfunction
Video output malfunction
