Toyota Yaris: Power Steering System / Lost Communication with Steering Angle Sensor Module Missing Message (U012687,U010087,U012987,U014087,U023A87)
DESCRIPTION
The power steering ECU assembly receives signals from the steering sensor, skid control ECU (brake actuator assembly), forward recognition camera, ECM and clearance warning ECU assembly via CAN communication.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
U010087 | Lost Communication With ECM/PCM "A" Missing Message | Lost communication with ECM | -
CAN communication system
-
ECM
| EPS warning light: Does not come on | After normal confirmation | - |
U012687 | Lost Communication with Steering Angle Sensor Module Missing Message | Lost communication with steering sensor | -
CAN communication system
-
Steering sensor
| EPS warning light: Does not come on | After normal confirmation | - |
U012987 | Lost Communication with Brake System Control Module Missing Message | Lost communication with skid control ECU (brake booster with master cylinder assembly) | -
CAN communication system
-
Skid control ECU (Brake booster with master cylinder assembly)(for TMC Made HV Model)
-
Skid control ECU (Brake actuator assembly)(for TMMF Made HV Model)
| EPS warning light: Does not come on | After normal confirmation | - |
U014087 | Lost Communication with Body Control Module Missing Message | Lost communication with main body ECU (multiplex network body ECU) | -
CAN communication system
-
Main body ECU (multiplex network body ECU)
| EPS warning light: Does not come on | After normal confirmation | - |
U023A87 | Lost Communication with Image Processing Module "A" Missing Message | Lost communication with forward recognition camera | -
CAN communication system
-
Forward recognition camera
| EPS warning light: Does not come on | After normal confirmation | w/ Toyota Safety Sense |
PROCEDURE
1. | GO TO CAN COMMUNICATION SYSTEM |
(a) Go to CAN communication system.
Click here
NEXT |
| END |
DESCRIPTION If a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU...
PROCEDURE 1. READ VALUE USING GTS (a) Read the Data List according to the display on the GTS. Chassis > EMPS > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Battery Voltage Drop History Number of times vehicle auxiliary battery voltage dropped Min...
Other information:
PARTS LOCATION ILLUSTRATION
*1 FRONT DOOR LOCK WITH MOTOR ASSEMBLY RH *2 FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH *3 FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH *4 FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH *5 BACK DOOR OPENER SWITCH ASSEMBLY *6 BACK DOOR LOCK ASSEMBLY WITH COURTESY LIGHT SWITCH ILLUSTRATION
*1 MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY *2 DOOR CONTROL SWITCH *3 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *4 POWER DISTRIBUTION BOX ASSEMBLY - ECU-IGR NO...
DESCRIPTION The steering sensor receives the turn signal switch information and controls the turn signal lights. WIRING DIAGRAM
PROCEDURE 1. READ VALUE USING GTS (a) Read the Data List according to the display on the GTS. Chassis > Steering Angle Sensor > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Turn Signal Switch (Right) Turn signal switch (right) signal OFF or ON OFF: Turn signal switch not in right turn position ON: Turn signal switch in right turn position - Turn Signal Switch (Left) Turn signal switch (left) signal OFF or ON OFF: Turn signal switch not in left turn position ON: Turn signal switch in left turn position - Cornering Light/Front Side Illuminate Light Switch Turn signal switch (full turn) signal OFF or ON OFF: Turn signal switch not in left or right turn position ON: Turn signal switch in left or right full turn position - OK: Normal conditions listed above are displayed...
Categories
If a key is left in the vehicle, the functions of the key left in the vehicle
are temporarily suspended to prevent theft of the vehicle.
To restore the functions, press the unlock button on the functions-suspended
key in the vehicle.
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