DTC U0073/86, U0100/85, U0122/83, U0126/84: Control Module Communication Bus OFF; Lost Communication with ECM / PCM "A"; Lost Communication with Vehicle Dynamics Control Module; Lost Communication with Steering Angle Sensor Module: Description
WARNING: This page is about a different car, the 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
- The 4WD control ECU inputs the signals sent from the ECM, skid control ECU, and steering angle sensor via the CAN communication system.
- When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
DTC TROUBLE DETECTION REFERENCE
| DTC No. |
DTC Detecting Condition |
Trouble Area |
| U0073/86 |
- When the following continues for 5 seconds or more:
- Signals from the 4WD control ECU are not received.
- When the following occurs 10 times consecutively:
- A communication malfunction (bus off) occurs one or more times within 0.1 second.
|
- Wire harness (CANL, CANH circuit)
- 4WD control ECU
|
| U0100/85 |
1. When both of the following continue for 2 seconds or more:
- The voltage of the IG1 terminal is 10 V or more.
- At a vehicle speed of 38 mph (60 km/h) or more, communication with the ECM cannot be performed continue for 2 seconds or more.
|
- Wire harness (CANL, CANH circuit)
- 4WD control ECU
- ECM
|
| U0122/83 |
- When both of the following continue for 3 seconds or more:
- The voltage of the IG1 terminal is 10 V or more.
- Communication with the skid control ECU cannot be performed.
|
- Wire harness (CANL, CANH circuit)
- 4WD control ECU
- Skid control ECU
|
| U0126/84 |
- When both of the following continue for 1 second or more:
- The voltage of the IG1 terminal is 10 V or more.
- Communication with the steering angle sensor cannot be performed.
- When both of the following occur 10 times consecutively:
- The voltage of the IG1 terminal is 10 V or more.
- The condition that communication with the steering angle sensor cannot be performed occurs once within 5 seconds.
|
- Wire harness (CANL, CANH circuit)
- 4WD control ECU
- Steering angle sensor
|