Lexus NX: Lost Communication With TCM (U0101,U0122,U0124,U0126,U0293)
DESCRIPTION
The absorber control ECU receives signals from the skid control ECU (brake booster with master cylinder assembly), steering sensor, airbag ECU assembly (built into acceleration sensor), ECM and hybrid vehicle control ECU via CAN communication.
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system first.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate |
|---|---|---|---|---|
| U0101 | Lost Communication With TCM | While driving at 30 km/h (19 mph), CAN communication from the ECM stops for 6 seconds or more. |
| Does not come on |
| U0122 | Lost Communication with Vehicle Dynamics Control Module | CAN communication from the skid control ECU (brake booster with master cylinder assembly) stops for 3 seconds or more. |
| Does not come on |
| U0124 | Lost Communication with Lateral Acceleration Sensor Module | CAN communication from the airbag ECU assembly (built into acceleration sensor) stops for 3 seconds or more. |
| Does not come on |
| U0126 | Lost Communication with Steering Angle Sensor Module | CAN communication from the steering sensor stops for 3 seconds or more. |
| Does not come on |
| U0293 | Lost Communication with Hybrid Vehicle Control System | While driving at 30 km/h (19 mph), CAN communication from the hybrid vehicle control ECU stops for 3 seconds or more. |
| Does not come on |
CAUTION / NOTICE / HINT
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
-
If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.
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-
Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation ; 2) DTC inspection ; and 3) Techstream inspection (ECU Data List or Active Test ). If no malfunctions are found in other areas, replace the absorber control ECU.
-
When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.
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PROCEDURE
| 1. | CHECK FOR DTC |
(a) Clear the DTCs.
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(b) Turn the power 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.
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| Result | Proceed to |
|---|---|
| CAN DTC is not output | A |
| CAN DTC is 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 malfunction DTC.
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
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Components
COMPONENTS ILLUSTRATION *1 ACCELERATION SENSOR *2 COWL SIDE TRIM BOARD LH *3 DOOR SCUFF PLATE ASSEMBLY LH *4 GLOVE COMPARTMENT DOOR ASSEMBLY *5 NO. 1 INSTRUMENT PANEL UNDER C
Removal
REMOVAL PROCEDURE 1. REMOVE DOOR SCUFF PLATE ASSEMBLY LH Click here 2. REMOVE COWL SIDE TRIM BOARD LH Click here 3. REMOVE NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY Click here 4. REMOVE GL
SEE MORE:
Reassembly
REASSEMBLY CAUTION / NOTICE / HINT NOTICE:
When using a vise, place aluminum plates between the part and vise.
When using a vise, do not overtighten it.
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. INSTALL OUTBOARD
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area"column of the table. Check each symptom by checking the suspected a
