Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK TIRE PRESSURE WARNING ECU AND RECEIVER
(a) Disconnect the N8 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.
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| *a | Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver) |
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| N8-1 (IG) - N8-12 (GND) | B - BR | IG power source | Engine switch on (IG) | 10 to 16 V |
| N8-7 (+B) - N8-12 (GND) | R - BR | Power supply (from battery) | Always | 10 to 16 V |
| N8-9 (CANH) - N8-10 (CANL) | L - W | CAN communication line | Engine switch off | 54 to 69 Ω |
| N8-12 (GND) - Body ground | BR - Body ground | Ground | Always | Below 1 Ω |
(b) Connect the N8 tire pressure warning ECU and receiver connector.
(c) Measure the voltage according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.
HINT:
Measure the values on the wire harness side while the connector is connected.
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| *a | Component with harness connected (Tire Pressure Warning ECU and Receiver) | - | - |
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| N8-3 (CLSW) - N8-12 (GND) | SB - BR | Tire pressure warning reset switch |
| Below 1.5 V |
| 8 to 15 V | |||
| N8-4 (RDA) - N8-12 (GND) | G - BR | Output signals | Engine switch on (IG) | Pulse generation (see waveform 1) |
| N8-5 (PRG) - N8-12 (GND) | V - BR | Input signals | Engine switch on (IG) | Pulse generation (see waveform 1) |
(d) Using an oscilloscope, check waveform 1.
.png)
| *a | Example |
| *b | GND |
| Item | Contents |
|---|---|
| Terminal | N8-4 (RDA) - N8-12 (GND) N8-5 (PRG) - N8-12 (GND) |
| Tool setting | 5 V/DIV, 5 ms./DIV. |
| Vehicle condition | Engine switch on (IG) |
HINT:
The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.
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