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
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