Toyota Tacoma 2015-2018 Service Manual: Acceleration Sensor Power Supply Voltage Malfunction (C1381)
DESCRIPTION
The skid control ECU (master cylinder solenoid) receives signals from the yaw rate and acceleration (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).
If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTCs U0123 (yaw rate sensor communication trouble) and U0124 (acceleration sensor communication trouble) are stored.
These DTCs are also output when calibration has not been completed.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1381 |
At a vehicle speed of more than 3 km/h (2 mph), the acceleration sensor power source malfunction signal is received for 10 seconds or more. |
|
WIRING DIAGRAM
Refer to DTCs C1232, C1243 and C1245 (See page
.gif)
).
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the yaw rate and acceleration sensor (airbag sensor assembly),
perform calibration (See page
).
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs (See page
).
|
Result |
Proceed to |
|---|---|
|
CAN DTC is not output |
A |
|
CAN DTC is output |
B |
| B | .gif) |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (IG2, E1, E2 TERMINAL) |
(a) Disconnect the yaw rate and acceleration sensor (airbag sensor assembly) connector.
|
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
.png)
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A21-25 (E1) - Body ground |
Always |
Below 1 Ω |
|
A21-26 (E2) - Body ground |
Always |
Below 1 Ω |
|
*a |
Front view of wire harness connector (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly)) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
RECONFIRM DTC |
(a) Reconnect the yaw rate and acceleration sensor (airbag sensor assembly) connector.
(b) Clear the DTCs (See page
).
(c) Start the engine.
(d) Perform a road test.
(e) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1381 is not output |
A |
|
DTC C1381 is output |
B |
| A | |
USE SIMULATION METHOD TO CHECK |
| B | |
REPLACE AIRBAG SENSOR ASSEMBLY |
Downhill Assist Control Switch Malfunction (Test Mode DTC) (C1379)
DESCRIPTION
DTC C1379 is cleared when the crawl control switch sends a crawl control operation
signal or when test mode ends.
DTC Code
DTC Detection Condition
Trou ...
Open or Short in Front Speed Sensor RH Circuit (C1405,C1406)
DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code
DTC Detection Condition
Trouble Area
C1405
C1406
Either condition is ...
Other materials:
CD Sound Skips
PROCEDURE
1.
CHECK CD
(a) Check that the CD is not deformed or cracked.
OK:
No deformation or cracks on the CD
NG
CD IS FAULTY
OK
...
Speaker Circuit
DESCRIPTION
If there is a short in a speaker circuit, the radio and display receiver
assembly detects it and stops output to the speakers.
Thus sound cannot be heard from the speakers even if there is no malfunction
in the radio and display receiver assembly or speakers.
If a ...
Installation
INSTALLATION
PROCEDURE
1. INSTALL HYDRAULIC BRAKE BOOSTER
(a) Install a new brake booster gasket onto the hydraulic brake booster.
(b) Install the hydraulic brake booster with the 4 nuts.
Torque:
14 N·m {145 kgf·cm, 10 ft·lbf}
(c) Using a union nut wrench, connect the 4 brake l ...