Toyota Tacoma 2015-2018 Service Manual: Yaw Rate Sensor (C1A46)
DESCRIPTION
If the millimeter wave radar sensor assembly receives a yaw rate sensor malfunction signal from the yaw rate sensor (airbag sensor assembly) or yaw rate sensor zero point malfunction signal from the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2, DTC C1A46 will be stored.
- *1: for Hydraulic Brake Booster
- *2: for Vacuum Brake Booster
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C1A46 |
Yaw Rate Sensor |
|
|
- *1: for Hydraulic Brake Booster
- *2: for Vacuum Brake Booster
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
- If the millimeter wave radar sensor assembly has been replaced, be sure
to perform millimeter wave radar sensor assembly adjustment.
Click here
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- The pre-collision system uses the CAN communication system. First, confirm
that there are no malfunctions in the CAN communication system. Refer to
How to Proceed with Troubleshooting.
Click here
PROCEDURE
|
1. |
CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM) |
HINT:
Pre-collision system DTC C1A46 may be stored due to a malfunction in the vehicle stability control system. Therefore, it is necessary to check for and troubleshoot vehicle stability control system DTCs first.
(a) Check for DTCs.
- for Hydraulic Brake Booster: Click here
- for Vacuum Brake Booster: Click here
|
Result |
Proceed to |
|---|---|
|
Vehicle stability control system DTCs are not output |
A |
|
Vehicle stability control system DTCs are output (for Hydraulic brake booster) |
B |
|
Vehicle stability control system DTCs are output (for Vacuum brake booster) |
C |
| B | .gif) |
GO TO VEHICLE STABILITY CONTROL SYSTEM |
| C | |
GO TO VEHICLE STABILITY CONTROL SYSTEM |
|
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|
2. |
CHECK FOR DTCs (PRE-COLLISION SYSTEM) |
(a) Clear the DTCs.
Click here
(b) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A46 is not output |
A |
|
DTC C1A46 is output |
B |
| A | |
USE SIMULATION METHOD TO CHECK |
| B | |
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
Front Radar Sensor Beam Axis Not Adjusted (C1A14)
DESCRIPTION
After installing a new millimeter wave radar sensor assembly, if sensor beam
axis adjustment has not been performed, DTC C1A14 will be stored.
DTC No.
Detection I ...
Vehicle Information Not Obtained (C1A02)
DESCRIPTION
When a new millimeter wave radar sensor assembly is installed, it receives vehicle
specification information from the main body ECU (multiplex network body ECU) and
stores the informa ...
Other materials:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
The ECM of this system is connected to the CAN communication system.
Therefore, before starting troubleshooting, make sure to check that there
is no trouble in the CAN and multiplex communication system.
*: Use the Techstream.
PROCEDURE
...
Removal
REMOVAL
PROCEDURE
1. REMOVE FUEL TANK ASSEMBLY
Click here
2. DISCONNECT FUEL TANK MAIN TUBE SUB-ASSEMBLY
Click here
3. REMOVE FUEL PUMP GAUGE RETAINER
NOTICE:
Before performing these procedures, first cover the connectors and tube joints
of the fuel suction tube with pump and gauge ass ...
Check Bus 3 Line for Short to +B
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no
resistance exists between terminal 6 (CA3H) of the central gateway ECU (network
gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central
gateway ECU (network gateway ECU) and t ...