Toyota Tacoma (2015-2018) Service Manual: Diameter of the Tire is not Uniform (C1337)
DESCRIPTION
The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from the speed sensors. These signals are used for recognizing whether all 4 wheels are operating properly. Therefore, all wheel signals must indicate the same speed.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C1337 |
Diameter of the Tire is not Uniform |
The following occurs in 3 consecutive trips: At a vehicle speed of 20 km/h (12 mph) or more, there is a difference of 20% or more in the average speed between the front wheels and rear wheels for 20 seconds or more. |
|
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform zero point
calibration and store system information (See page
.gif)
).
PROCEDURE
|
1. |
CHECK DTC |
(a) Check if any DTCs relating to the speed sensor circuit are output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC is not output |
A |
|
DTC is output |
B |
| B | .gif) |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
.gif)
|
2. |
CHECK TIRE SIZE |
(a) Check the tire size and condition of all 4 wheels.
OK:
All 4 tires are the same size and in the same condition.
| NG | |
REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME SIZE AND IN THE SAME CONDITION |
|
|
3. |
RECONFIRM DTC |
(a) Clear the DTC (See page
).
(b) Turn the ignition switch off.
(c) Perform the following 3 times:
Turn the ignition switch to ON and start the engine, drive the vehicle at a speed of 30 km/h (19 mph) or more for at least 30 seconds, and then stop the vehicle and turn the ignition switch off.
(d) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC is output |
A |
|
DTC is not output |
B |
| A | |
REPLACE BRAKE ACTUATOR ASSEMBLY |
| B | |
USE SIMULATION METHOD TO CHECK |
Steering Angle Sensor Zero Point Malfunction (C1290)
DESCRIPTION
The skid control ECU (brake actuator assembly) acquires steering angle sensor
zero point every time the ignition switch is turned ON and the vehicle is driven
at 35 km/h (22 mph) or m ...
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
...
Other materials:
Front Right Seat Heat Sensor Circuit (B14C0)
DESCRIPTION
Output to the front seat cushion heater assembly RH temperature sensor stops
if one of the following occurs: 1) the temperature sensor is open or shorted; or
2) the temperature sensor is damaged and its output value does not change.
DTC Code
DTC Detection Cond ...
Reassembly
REASSEMBLY
CAUTION / NOTICE / HINT
HINT:
Perform "Inspection After Repairs" after replacing the cylinder head sub-assembly
or cylinder head LH (See page ).
PROCEDURE
1. INSTALL SPARK PLUG TUBE
NOTICE:
When using a new cylinder head, the spark plug tubes must be replaced.
...
Steering Angle Sensor Communication Stop Mode
DESCRIPTION
Detection Item
Symptom
Trouble Area
Steering Angle Sensor Communication Stop Mode
Either condition is met:
Communication stop for "Spiral cable (Steering Angle Sensor)"
is indicated on the "C ...
