Toyota Yaris: Active Torque Split Awd System / Lost Communication with ECM/PCM "A" Missing Message (U010087,U012687,U012987)
DESCRIPTION
The AWD ECU assembly receives signals from the ECM, steering sensor and skid control ECU (brake actuator assembly) via CAN communication.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Memory |
U010087 | Lost Communication with ECM/PCM "A" Missing Message | When the ignition switch is ON, the IG1 terminal voltage is 10 V or more and the vehicle speed is 60 km/h (37 mph) or more, signals cannot be received from the ECM for 1 second or more | -
CAN communication system
-
AWD ECU assembly
-
ECM
| Displayed | Yes |
U012687 | Lost Communication with Steering Angle Sensor Module Missing Message | -
When the following continues:
-
When the IG1 terminal voltage is 10 V or more, communication with the steering sensor is impossible for 1 second or more
-
When the IG1 terminal voltage is 10 V or more, a condition in which communication with the steering sensor is impossible occurs 1 time or more within a 5-second period, and this occurs 10 times within 60 seconds
| -
CAN communication system
-
AWD ECU assembly
-
Steering sensor
| Displayed | Yes |
U012987 | Lost Communication with Brake System Control Module Missing Message | When the IG1 terminal voltage is 10 V or more, communication with the skid control ECU (brake actuator assembly) is impossible for 3 seconds or more | -
CAN communication system
-
AWD ECU assembly
-
Skid control ECU (Brake actuator assembly)
| Displayed | Yes |
PROCEDURE
(a) Check for DTCs.
Click here
Chassis > Four Wheel Drive > Trouble Codes
(b) Record the output DTCs.
HINT:
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
NEXT |
| GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
DESCRIPTION When a malfunction has occurred in the power source circuit, the AWD ECU assembly stores DTC C123A1C. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory C123A1C Supply Voltage Circuit Circuit Voltage Out of Range
At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is less than 9...
DESCRIPTION The AWD ECU assembly is connected to the combination meter assembly via the CAN communication system. If the AWD ECU assembly stores any DTCs which are related to the active torque split AWD system, the warning message is displayed on the multi-information display in the combination meter assembly...
Other information:
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the CXPI communication system.
*: Use the GTS.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT
2. INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage with the ignition switch off...
These lights turn on or flash to notify the user of the system operation
status or a system malfunction.
Master
Warning Light
Brake
System Warning Light
ABS
Warning Light
Charging System Warning Light
Engine
Oil Warning Light
Check
Engine Light
High
Engine Coolant Temperature Warning Light
Automatic Transaxle Warning Light
Power
Steering Malfunction Indicator Light
Air
Bag/Front Seat Belt Pretensioner System Warning Light
LED
Headlight Warning Light
Low
Fuel Warning Light
Check
Fuel Cap Warning Light
Seat
Belt Warning Light (Front seat)
Door-Ajar Warning Light
Low
Washer Fluid Level Warning Light
Tire
Pressure Monitoring System Warning Light
KEY
Warning Light
Low
Speed Pre-Collision System Warning Light
* 1: The light turns on when the ignition is switched on for
an operation check,
and turns off a few seconds later or when the engine is started...
Categories
Stop the vehicle completely.
Manual transaxle:
Shift into neutral and set the parking brake.
Automatic transaxle:
Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is
off.
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