Toyota Sienna Service Manual: Steering Angle Sensor Circuit Malfunction
DTC C1231/31 Steering Angle Sensor Circuit Malfunction
DESCRIPTION
The steering angle sensor signal is sent to the skid control ECU through the CAN communication system.
When there is a malfunction in the communication, it will be detected by the
diagnosis function.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- When U0073/94, U0100/65, U0123/62, U0124/95 or U0126/63 are output accompanied with C1231/ 31, inspect and repair the trouble areas indicated by U0073/94, U0100/65, U0123/62, U0124/95 or U0126/63 first.
- When the speed sensor or the yaw rate sensor has trouble. DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate sensor are output accompanied with other DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate sensor first, and the n inspect and repair the steering angle sensor.
1 INSPECT STEERING ANGLE SENSOR
(a) Remove the steering wheel and the column lower cover.
(b) Disconnect the steering angle sensor connector.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage 
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage 
REPLACE STEERING ANGLE SENSOR
SM Solenoid Circuit
DTC C1225/25 SM Solenoid Circuit
DESCRIPTION
This solenoid turns on when receiving signals the ECU and controls the
pressure acting on the wheel
cylinders to control the braking force.
WIRIN ...
Stuck in Deceleration Sensor
DESCRIPTION
The yaw rate sensor and deceleration sensor signal is sent to the skid
control ECU through the CAN
communication system. When there is a malfunction in the communication, it will
...
Other materials:
Disassembly
HINT:
When the battery is reconnected, the back door is locked and
cannot be opened. Therefore, it is necessary to unlock the
back door using the door control switch or transmitter switch.
1. REMOVE BACK DOOR SCUFF PLATE (See page ET-
18)
2. REMOVE QUARTER TRIM PANEL ASSEMBLY
FRONT LH
3. REM ...
Short in CAN Bus Lines
DESCRIPTION
The CAN bus wires are considered to be shorted when the resistance between
terminals 6 (CANH) and
14 (CANL) of the DLC3 is below 54 Ω.
Symptom
Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3
is below 54 Ω.
...
Power outlets
The power outlet can be used for the following components:
12 V: Accessories that run on less than 10 A
120 V AC: Accessories that use less than 100 W
12 V
Open the cover.
Center panel type A
Center panel type B
Luggage compartment
120 V AC (if equipped)
Open the ...
