Toyota Tacoma 2015-2018 Service Manual: Brake System Malfunction (C1A50)
DESCRIPTION
When the pre-collision system is operating, the millimeter wave radar sensor assembly sends brake control signals to the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2.
If the millimeter wave radar sensor assembly receives a vehicle stability control system malfunction signal from the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 via CAN communication, DTC C1A50 will be stored.
- *1: for Hydraulic Brake Booster
- *2: for Vacuum Brake Booster
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C1A50 |
Brake System Malfunction |
While the ignition switch is ON, the millimeter wave radar sensor assembly receives a vehicle stability control system malfunction signal from the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 for 1 second or more. |
|
- *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 C1A50 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.
Click here
|
Result |
Proceed to |
|---|---|
|
Vehicle stability control system DTCs are not output |
A |
|
Vehicle stability control system DTCs are output |
B |
| B | .gif) |
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 C1A50 is not output |
A |
|
DTC C1A50 is output |
B |
| A | |
USE SIMULATION METHOD TO CHECK |
| B | |
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
Front Camera Module Beam Axis Not Adjusted (C1AA9)
DESCRIPTION
If forward recognition camera adjustment has not been performed or did not complete
normally after the forward recognition camera was replaced with a new one, DTC C1AA9
will be stored ...
Other System Malfunction (C1A63)
DESCRIPTION
The millimeter wave radar sensor assembly receives accelerator pedal position
sensor signals from the ECM to determine if the accelerator pedal is being depressed.
If the ECM detects ...
Other materials:
Transponder Key Ecu
Components
COMPONENTS
ILLUSTRATION
Installation
INSTALLATION
PROCEDURE
1. INSTALL TRANSPONDER KEY ECU
(a) Engage the 2 guides to move the transponder key ECU in the direction
of the arrow to install the transponder key ECU.
2. IN ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of the problem symptom.
The potential causes of the symptoms are listed in order of probability
in the "Suspected Area" column of the table. Check each symptom by checking
the suspected areas ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT FUEL INJECTOR ASSEMBLY
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
1 - 2
20°C (68°F)
11.6 ...