Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu
TERMINALS OF ECU
1. CHECK COMBINATION METER ASSEMBLY
(a) Measure the resistance and voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
C9-19 (B) - Body ground |
P - Body ground |
Battery power supply |
Always |
11 to 14 V |
|
C9-20 (IG+) - Body ground |
BE - Body ground |
Ignition switch power supply |
Ignition switch ON |
11 to 14 V |
|
Ignition switch off |
Below 1 V |
|||
|
C9-17 (EP) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
C9-18 (ES) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
C9-1 (CANH) - Body ground |
G - Body ground |
CAN communication line |
Always |
200 Ω or higher |
|
C9-2 (CANL) - Body ground |
W - Body ground |
CAN communication line |
Always |
200 Ω or higher |
- If the result is not as specified, the combination meter assembly may have a malfunction.
2. CHECK CENTER AIRBAG SENSOR ASSEMBLY
|
Terminal No. |
Terminal Symbol |
Destination |
|---|---|---|
|
A23-12 |
FSR+ |
Occupant classification ECU |
|
A23-13 |
FSR- |
Occupant classification ECU |
|
A22-11 |
LBE+ |
Front seat inner belt assembly (for driver side) |
|
A22-12 |
LBE- |
Front seat inner belt assembly (for driver side) |
3. CHECK OCCUPANT CLASSIFICATION ECU
(a) Measure the voltage and check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
O5-1 (+B) - O5-3 (GND) |
R - W-B |
Battery power supply |
Always |
11 to 14 V |
|
O5-2 (DIA) - O5-3 (GND) |
W - W-B |
Diagnosis (DLC3) |
Ignition switch ON |
Pulse generation |
|
O5-3 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 V |
|
O5-7 (IG) - O5-3 (GND) |
BE - W-B |
Ignition switch power supply |
Ignition switch ON |
11 to 14 V |
|
O5-8 (FSR+) - O5-4 (FSR-) |
W - B |
Center airbag sensor assembly communication line |
Ignition switch ON |
Pulse generation |
|
O5-9 (BSW) - O5-5 (BGND) |
G - P-G |
Front passenger side buckle switch line |
Always |
4 to 14 V |
|
O4-1 (SGD1) - O5-3 (GND) |
L - W-B |
Front occupant classification sensor LH ground line |
Always |
Below 1 V |
|
O4-2 (SGD2) - O5-3 (GND) |
BE - W-B |
Front occupant classification sensor RH ground line |
Always |
Below 1 V |
|
O4-3 (SGD3) - O5-3 (GND) |
P-G - W-B |
Rear occupant classification sensor LH ground line |
Always |
Below 1 V |
|
O4-4 (SGD4) - O5-3 (GND) |
B-R - W-B |
Rear occupant classification sensor RH ground line |
Always |
Below 1 V |
|
O4-11 (SVC1) - O4-1 (SGD1) |
B-L - L |
Front occupant classification sensor LH power supply line |
Ignition switch ON, a load applied to front occupant classification sensor LH |
4.9 to 5.1 V |
|
O4-12 (SVC2) - O4-2 (SGD2) |
LG-B - BE |
Front occupant classification sensor RH power supply line |
Ignition switch ON, a load applied to front occupant classification sensor RH |
4.9 to 5.1 V |
|
O4-5 (SVC3) - O4-3 (SGD3) |
B - P-G |
Rear occupant classification sensor LH power supply line |
Ignition switch ON, a load applied to rear occupant classification sensor LH |
4.9 to 5.1 V |
|
O4-6 (SVC4) - O4-4 (SGD4) |
GR-L - B-R |
Rear occupant classification sensor RH power supply line |
Ignition switch ON, a load applied to rear occupant classification sensor RH |
4.9 to 5.1 V |
|
O4-7 (SIG1) - O4-1 (SGD1) |
G - L |
Front occupant classification sensor LH signal line |
Ignition switch ON, a load applied to front occupant classification sensor LH |
0 to 5.1 V |
|
O4-8 (SIG2) - O4-2 (SGD2) |
R-L - BE |
Front occupant classification sensor RH signal line |
Ignition switch ON, a load applied to front occupant classification sensor RH |
0 to 5.1 V |
|
O4-9 (SIG3) - O4-3 (SGD3) |
R-B - P-G |
Rear occupant classification sensor LH signal line |
Ignition switch ON, a load applied to rear occupant classification sensor LH |
0 to 5.1 V |
|
O4-10 (SIG4) - O4-4 (SGD4) |
L-R - B-R |
Rear occupant classification sensor RH signal line |
Ignition switch ON, a load applied to rear occupant classification sensor RH |
0 to 5.1 V |
- If the result is not as specified, the occupant classification ECU may have a malfunction.
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are lis ...
Driver Side Seat Belt Warning Light does not Operate
DESCRIPTION
When the ignition switch is ON, the airbag sensor assembly transmits front seat
inner belt status signals to the combination meter assembly through CAN. If the
driver seat belt is not ...
Other materials:
Fail-safe Chart
FAIL-SAFE CHART
HINT:
If any of the following auto cancel conditions are detected while the dynamic
radar cruise control system is controlling vehicle speed, the system clears the
stored vehicle speed and cancels control of vehicle speed by the dynamic radar cruise
control system.
Automatic ...
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows values or states of switches,
sensors, actuators and other items to be read without removing any parts. This non-intrusive
inspection can be very useful because intermittent conditions or signals may ...
Components
COMPONENTS
ILLUSTRATION
ILLUSTRATION
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ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
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