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
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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
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SEE MORE:
Installation
INSTALLATION PROCEDURE 1. PRECAUTION NOTICE: After turning the engine switch (for Gasoline Model) or power switch (for HV Model) off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable
Crankshaft Position Sensor "A" Circuit Short to Ground (P033511,P033515)
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