Lexus ES: Control Module Communication Bus "B" Off Bus Off (U007488,...,U015187)
DESCRIPTION
The skid control ECU (brake actuator assembly) communicates with the following ECUs and sensors via CAN communication.
- ECM
- TCM (ECM)
- Yaw rate and acceleration sensor (airbag ECU assembly)
- Steering angle sensor
- Power steering ECU (rack and pinion power steering gear assembly)
- Main body ECU (multiplex network body ECU)
- Airbag ECU assembly
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U007488 | Control Module Communication Bus "B" Off Bus Off | The +BS terminal voltage is between 9.6 and a 16.5 V and a bus OFF state occurs for 0.1 seconds or more. | CAN communication system |
| U010087 | Lost Communication with ECM/PCM "A" Missing Message | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals cannot be sent to the ECM for 2 seconds or more. |
|
| U010187 | Lost Communication with TCM Missing Message | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals cannot be sent to the TCM (ECM) for 2 seconds or more. |
|
| U012587 | Lost Communication With Multi-axis Acceleration Sensor Module Missing Message | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the yaw rate and acceleration sensor (airbag ECU assembly) cannot be received for 1 second or more. |
|
| U012687 | Lost Communication with Steering Angle Sensor Module Missing Message | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the steering angle sensor cannot be received for 1 second or more. |
|
| U013187 | Lost Communication With Power Steering Control Module Missing Message | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the power steering ECU (rack and pinion power steering gear assembly) cannot be received for 2 second or more. |
|
| U014087 | Lost Communication with Body Control Module Missing Message | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, data cannot be received from main body ECU (multiplex network body ECU) continuously for 2 seconds or more. |
|
| U015187 | Lost Communication with Restraints Control Module Missing Message | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the airbag ECU assembly cannot be received for 5 seconds or more. |
|
PROCEDURE
| 1. | CHECK DTC OUTPUT (HEALTH CHECK) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Chassis > Brake/EPB > Clear DTCs(d) Press the DTC clear button.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG).
(g) Enter the following menus: System Select / Health Check.
(h) Check for DTCs.
| Result | Proceed to |
|---|---|
| DTCs for related systems are output together with DTC U007488, U010087, U010187, U012587, U012687, U013187, U014087 or U015187. | A |
| U007488, U010087, U010187, U012587, U012687, U013187, U014087 or U015187 is output. | B |
| DTCs are not output. | C |
| A |  | GO TO DIAGNOSTIC TROUBLE CODE CHART (RELATED SYSTEM) |
| B | | INSPECT CAN COMMUNICATION SYSTEM |
| C | | USE SIMULATION METHOD TO CHECK |
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