Toyota Camry (XV70): Terminals Of Ecu
TERMINALS OF ECU
CHECK TIRE PRESSURE WARNING ECU AND RECEIVER
(a) Disconnect the R127 or R128 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.
|
*A | w/ Smart Key System |
|
*B | w/o Smart Key System |
|
*a | Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver) |
|
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition |
|---|---|---|---|---|
|
R127-1 (IG) - R127-12 (GND) |
LA-B - W-B | IG power source |
Ignition switch ON | 10 to 16 V |
|
R127-7 (+B) - R127-12 (GND) |
LA-R - W-B | Power supply (from battery) |
Always | 10 to 16 V |
|
R127-9 (CANH) - R127-10 (CANL)* |
L - W | CAN communication line |
Ignition switch off | 54 to 69 Ω |
|
R127-12 (GND) - Body ground |
W-B - Body ground | Ground |
Always | Below 1 Ω |
- *: w/ Tire Inflation Pressure Display Function
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Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition |
|---|---|---|---|---|
|
R128-1 (IG) - R128-12 (GND) |
LA-LG - W-B*2 LA-B - W-B*3 |
IG power source | Ignition switch ON |
10 to 16 V |
|
R128-7 (+B) - R128-12 (GND) |
LA-L - W-B | Power supply (from battery) |
Always | 10 to 16 V |
|
R128-9 (CANH) - R128-10 (CANL)*1 |
L - W | CAN communication line |
Ignition switch off | 54 to 69 Ω |
|
R128-12 (GND) - Body ground |
W-B - Body ground | Ground |
Always | Below 1 Ω |
- *1: w/ Tire Inflation Pressure Display Function
- *2: w/ Blind Spot Monitor System
- *3: w/o Blind Spot Monitor System
(b) Connect the R127 or R128 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.
|
*A | w/ Smart Key System |
*B | w/o Smart Key System |
|
*a | Component with harness connected (Tire Pressure Warning ECU and Receiver) |
- | - |
|
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition |
|---|---|---|---|---|
|
R127-3 (CLSW) - R127-12 (GND) |
SB - W-B |
Tire pressure warning reset switch |
| Below 1.5 V |
| 8 to 15 V | |||
|
R127-4 (RDA) - R127-12 (GND) |
GR - W-B | Output signals |
Ignition switch ON | Pulse generation (see waveform 1) |
|
R127-5 (PRG) - R127-12 (GND) |
R - W-B | Input signals |
Ignition switch ON | Pulse generation (see waveform 1) |
|
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition |
|---|---|---|---|---|
|
R128-3 (CLSW) - R128-12 (GND) |
SB - W-B |
Tire pressure warning reset switch |
| Below 1.5 V |
| 8 to 15 V | |||
|
R128-4 (RDA) - R128-12 (GND) |
GR - W-B | Output signals |
Ignition switch ON | Pulse generation (see waveform 1) |
|
R128-5 (PRG) - R128-12 (GND) |
R - W-B | Input signals |
Ignition switch ON | Pulse generation (see waveform 1) |
(d) Using an oscilloscope, check waveform 1.
|
*a | Example |
|
*b | GND |
|
Item | Contents |
|---|---|
|
Terminal | R127-4 (RDA) - R127-12 (GND)*1 R128-4 (RDA) - R128-12 (GND)*2 R127-5 (PRG) - R127-12 (GND)*1 R128-5 (PRG) - R128-12 (GND)*2 |
|
Tool setting | 5 V/DIV, 5 ms./DIV. |
|
Vehicle condition | Ignition switch ON |
- *1: w/ Smart Key System
- *2: w/o Smart Key System
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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SEE MORE:
Exhaust gas precautions
Harmful substance to the human body is included in exhaust
gases if inhaled.
WARNING
Exhaust gases include harmful carbon monoxide (CO), which is colorless and
odorless. Observe the following precautions.
Failure to do so may cause exhaust gases enter the vehicle and may lead to
an accident
Parts Location
PARTS LOCATION ILLUSTRATION
*1 INTAKE AIR CONTROL VALVE (for ACIS)
*2 ECM
*3 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY
- EFI NO. 1 FUSE -
-
