Lexus ES manuals

Lexus ES: Lost Communication With ECM/PCM "A" (U0100-U0122,U0124,U0126,U1103)

Lexus ES (XZ10) Service Manual / Suspension / Suspension Control / Adaptive Variable Suspension System / 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.
  • ECM
  • CAN communication system
  • Absorber control ECU

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.
  • ECM
  • CAN communication system
  • Absorber control ECU

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.
  • Skid control ECU (brake actuator assembly)
  • CAN communication system
  • Absorber control ECU

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.
  • Airbag ECU assembly
  • CAN communication system
  • Absorber control ECU

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.
  • Steering sensor
  • CAN communication system
  • Absorber control ECU

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.
  • Engine stop and start ECU
  • CAN communication system
  • Absorber control ECU

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

    • DTC inspection.

      Click here

    • Techstream inspection.

      Click here

      • If no malfunctions are found in other areas, replace the absorber control ECU.
  • 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

Chassis > Air suspension > Clear DTCs

(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

Chassis > Air suspension > Trouble Codes

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

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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