Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK ECM
HINT:
As a waterproof connector is used for the ECM, voltage, resistance and waveform inspections cannot be performed. The voltage, resistance and waveform values are provided for reference only.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A25-27 (STP) - C32-53 (E1) | SB - W-B | Stop light switch signal | Brake pedal depressed | 7.5 to 14 V |
| Brake pedal released | Below 1.5 V | |||
| A25-42 (ST1-) - C32-53 (E1) | LG - W-B | Stop light switch signal | Engine switch on (IG), brake pedal depressed | 0 to 1.5 V |
| Engine switch on (IG), brake pedal released | 7.5 to 14 V | |||
| A25-41 (CCS) - C32-53 (E1) | R - W-B | Steering pad switch circuit | Cruise control switch not pushed | 1 MΩ or higher |
| Cruise control main switch pushed | Below 2.5 Ω | |||
| CANCEL switch pushed | 228 to 252 Ω | |||
| +RES switch pushed | 599 to 661 Ω | |||
| -SET switch pushed | 1463 to 1617 Ω |
NOTICE:
- Turning the engine switch on (IG) with connectors disconnected may cause DTCs to be stored. Make sure to clear the DTCs after inspection has been performed.
- Do not apply excessive force to the forward recognition camera connector.
CHECK FORWARD RECOGNITION CAMERA
(a) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| P5-3 (LKSW) - P5-10 (GND) | BE - LA | Steering pad switch assembly signal (distance control signal) | Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) on | Below 1 V |
| Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) off | 4.75 to 5.25 V | |||
| P5-10 (GND) - Body ground | LA - Body ground | Ground | Always | Below 1 Ω |
| P5-7 (IGB) - P5-10 (GND) | LA-P - LA | Power source | Engine switch on (IG) | 11 to 14 V |
| Engine switch off | Below 1 V |
(b) Check for pulses according to the value(s) in the table below.
HINT:
If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the forward recognition camera is suspected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| P5-6 (CANH) - P5-10 (GND) | B - LA | CAN communication signal | Engine switch on (IG) | Pulse generation (See waveform 1) |
| P5-12 (CANL) - P5-10 (GND) | W - LA | Pulse generation (See waveform 2) | ||
| P5-5 (CA1P) - P5-10 (GND) | L - LA | Pulse generation (See waveform 1) | ||
| P5-11 (CA1N) - P5-10 (GND) | W - LA | Pulse generation (See waveform 2) |
(1) WAVEFORM 1
| Item | Content |
|---|---|
| Tester Connection |
|
| Tool Setting | 1 V/DIV., 10 μs/DIV. |
| Condition | Engine switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
(2) WAVEFORM 2
| Item | Content |
|---|---|
| Tester Connection |
|
| Tool Setting | 1 V/DIV., 10 μs/DIV. |
| Condition | Engine switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
READ NEXT:
Diagnosis System
DIAGNOSIS SYSTEM DIAGNOSIS FUNCTION (a) The diagnosis function turns off the cruise control indicator, illuminates the master warning light and displays a warning message when a malfunction is detecte
Dtc Check / Clear
DTC CHECK / CLEAR NOTICE: When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and freeze frame data recorded in normal mode are cleared. Before changing modes,
Freeze Frame Data
FREEZE FRAME DATA CHECK FREEZE FRAME DATA HINT: The ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. (a) Connect the Techstream to the DLC3. (b) T
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT TIRES (a) Inspect the tires for wear and proper inflation pressure. Cold Tire Inflation Pressure: Tire Size Cold Tire Inflation Pressure Front Rear 215/55R17 94V 250 kPa (2.5 kgf/cm2, 36 psi) 235/45R18 94V 235/40R19 92V 240 kPa (2.4 kgf/cm2, 35
On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT CAMSHAFT TIMING OIL CONTROL SOLENOID ASSEMBLY (a) Connect the Techstream to the DLC3. (b) Start the engine. (c) Turn the Techstream on. (d) Inspect the camshaft timing oil control solenoid assembly (for intake side). (1) Enter the following menus: Powertrai
