Lexus ES: Lost Communication With ECM/PCM "A" (U0100-U0122,U0124,U0126,U1103)
DESCRIPTION
The absorber control ECU receives signals from the ECM, skid control ECU (brake actuator assembly), airbag ECU assembly, steering sensor and engine stop and start ECU* via CAN communication.
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system first.
- *: w/ Stop and Start System
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Memory |
|---|---|---|---|---|---|
| U0100 | Lost Communication With ECM/PCM "A" | While driving at 30 km/h (19 mph) or more, data is not received via CAN communication for 3 seconds or more. |
| Does not come on | Yes |
| U0101 | Lost Communication with TCM | While driving at 30 km/h (19 mph) or more, data is not received via CAN communication for 6 seconds or more. |
| Does not come on | Yes |
| U0122 | Lost Communication With Vehicle Dynamics Control Module | Data is not received from the skid control ECU (brake actuator assembly) via CAN communication for 3 seconds or more. |
| Does not come on | Yes |
| U0124 | Lost Communication with Lateral Acceleration Sensor Module | Data is not received from the airbag ECU assembly via CAN communication for 3 seconds or more. |
| Does not come on | Yes |
| U0126 | Lost Communication with Steering Angle Sensor Module | Data is not received from the steering sensor via CAN communication for 3 seconds or more. |
| Does not come on | Yes |
| U1103 | Lost Communication with Stop and Start Control Module | Data is not received from the engine stop and start ECU via CAN communication for 3 seconds or more. |
| Does not come on | Yes |
CAUTION / NOTICE / HINT
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
-
Before replacing the absorber control ECU, perform all of the following:
-
Symptom simulation.
Click here
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-
DTC inspection.
Click here
-
Techstream inspection.
Click here
- If no malfunctions are found in other areas, replace the absorber control ECU.
-
Symptom simulation.
-
After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.
Click here
PROCEDURE
| 1. | CHECK FOR DTCS |
(a) Clear the DTCs.
Click here
(b) Turn the engine switch off.
(c) Drive the vehicle at a speed of 30 km/h (19 mph) or more for 10 seconds or more.
(d) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| CAN DTCs are not output | A |
| CAN DTCs are output | B |
HINT:
If a CAN communication malfunction DTC and a related sensor malfunction DTC are output at the same time, the CAN communication malfunction must be repaired before troubleshooting the sensor.
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
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Removal
REMOVAL PROCEDURE 1. REMOVE FRONT DOOR SCUFF PLATE LH (for LH Side) Click here 2. REMOVE COWL SIDE TRIM BOARD LH (for LH Side) Click here 3. REMOVE NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBL
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the LIN communication system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
In troubleshooting, confirm that the problem s
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