Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu
TERMINALS OF ECU
1. TERMINALS OF ECU
Text in Illustration
|
*a |
Component without harness connected (Skid Control ECU (Master Cylinder Solenoid)) |
- |
- |
|
Terminal No. (Symbol) |
Terminal Description |
|---|---|
|
S1-1 (GND1) |
Ground |
|
S1-2 (+BM1) |
Power supply for motor |
|
S1-3 (FR+) |
Front wheel speed sensor RH power supply output |
|
S1-4 (FL-) |
Front wheel speed LH signal input |
|
S1-5 (RR+) |
Rear wheel speed sensor RH power supply output |
|
S1-6 (RL-) |
Rear wheel speed LH signal input |
|
S1-7 (STP) |
Stop light switch input |
|
S1-9 (CSW) |
VSC OFF switch input |
|
S1-11 (CANH) |
CAN communication line H |
|
S1-12 (SP1) |
Speed signal output for speedometer |
|
S1-13 (TRM3) |
A-TRAC switch input*1 CRAWL speed selector switch*2 |
|
S1-16 (STPO) |
Stop light operated relay output |
|
S1-17 (FR-) |
Front wheel speed sensor RH input |
|
S1-18 (FL+) |
Front wheel speed sensor LH power supply output |
|
S1-19 (RR-) |
Rear wheel speed sensor RH input |
|
S1-20 (RL+) |
Rear wheel speed sensor LH power supply output |
|
S1-21 (TRM2) |
CRAWL speed selector switch*2 |
|
S1-25 (CANL) |
CAN communication line L |
|
S1-27 (EXI) |
L4 detection switch input |
|
S1-28 (PKB) |
MTS SET switch input |
|
S1-29 (EXI4) |
4WD detection switch input |
|
S1-31 (+BS) |
Power supply for solenoid |
|
S1-32 (GND2) |
Ground |
|
S1-41 (LBL) |
Brake fluid level warning switch input |
|
S1-43 (TRS) |
CRAWL ON/OFF switch*2 |
|
S1-44 (TRM1) |
CRAWL speed selector switch*2 |
|
S1-45 (STP2) |
Stop light switch input |
|
S1-46 (IG1) |
IG1 power supply |
|
S2-1 (IG2) |
IG2 power supply |
|
S2-2 (+BM2) |
Power supply for motor |
|
S2-4 (GND3) |
Ground |
- *1: for Manual Transmission
- *2: for Automatic Transmission
2. TERMINAL INSPECTION
Disconnect the connector and measure the voltage or resistance on the wire harness side.
HINT:
Voltage cannot be measured with the connector connected to the skid control ECU (master cylinder solenoid) as the connector is water resistant.
Text in Illustration
|
*a |
Front view of wire harness connector (Skid Control ECU (Master Cylinder Solenoid)) |
- |
- |
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
S1-1 (GND1) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
S1-2 (+BM1) - Body ground |
B - Body ground |
Power supply for motor from battery |
Always |
11 to 14 V |
|
S1-7 (STP) - Body ground |
SB - Body ground |
Stop light switch input |
Stop light switch off (Brake pedal released) |
Below 1.5 V |
|
Stop light switch on (Brake pedal depressed) |
8 to 14 V |
|||
|
S1-9 (CSW) - Body ground |
GR - Body ground |
VSC OFF switch input |
VSC OFF switch off |
10 kΩ or higher |
|
VSC OFF switch on and hold |
Below 1 Ω |
|||
|
S1-16 (STPO) - Body ground |
B - Body ground |
Stop light operated relay output |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
11 to 14 V |
|||
|
S1-31 (+BS) - Body ground |
R - Body ground |
Power supply for solenoid from battery |
Always |
11 to 14 V |
|
S1-32 (GND2) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
S1-41 (LBL) - Body ground |
V - Body ground |
Brake fluid level warning switch input |
Brake fluid level min. -5 mm |
Below 1 Ω |
|
Brake fluid level max. |
1.9 to 2.1 kΩ |
|||
|
S1-45 (STP2) - Body ground |
L - Body ground |
Stop light switch input |
Stop light switch off (Brake pedal released) |
Below 1.5 V |
|
Stop light switch on (Brake pedal depressed) |
8 to 14 V |
|||
|
S1-46 (IG1) - Body ground |
G - Body ground |
IG1 power supply |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
11 to 14 V |
|||
|
S2-1 (IG2) - Body ground |
BE - Body ground |
IG2 power supply |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
11 to 14 V |
|||
|
S2-2 (+BM2) - Body ground |
B - Body ground |
Power supply for motor from battery |
Always |
11 to 14 V |
|
S2-4 (GND3) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
Test Mode Procedure
TEST MODE PROCEDURE
1. TEST MODE PROCEDURE (for Using Techstream)
HINT:
If the ignition switch is turned from the ON to the ACC or LOCK position
during test mode, DTCs related to the si ...
Diagnosis System
DIAGNOSIS SYSTEM
1. DIAGNOSIS
(a) If the skid control ECU (master cylinder solenoid) detects a malfunction,
the ABS and/or BRAKE warning lights and the slip indicator lights come on in accordance ...
Other materials:
Stop Light Control Relay Malfunction (C1380)
DESCRIPTION
The skid control ECU (brake actuator assembly) inputs the stop light switch signal
and detect the status of the brake operation.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C1380
Stop Light Contro ...
Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) (C1277,...,C1416)
DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code
DTC Detection Condition
Trouble Area
C1277
C1278
Stored only during test mode.
Rear speed sensor RH/LH
Rear speed sensor rotor RH/LH (Rear ax ...
Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMS
HINT:
Inspect the vehicle ECM using check mode. Intermittent problems are easier to
detect with the Techstream when the ECM is in check mode. In check mode, the ECM
uses 1 trip detection logic, which is more sensitive to malfunctions than normal
mode (default) ...
