Lexus ES: Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087,U016487)
DESCRIPTION
These DTCs are stored when a malfunction occurs in the CAN communication circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U010087 | Lost Communication With ECM/PCM "A" Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in engine system for 1 second or more continuously, 3 seconds or more after engine switch is turned on (IG)* | CAN communication system |
| U012987 | Lost Communication With Brake System Control Module Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in brake system for 1 second or more continuously, 3 seconds or more after engine switch is turned on (IG)* | CAN communication system |
| U014087 | Lost Communication with Body Control Module Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in main body ECU for 3 seconds or more continuously, 3 seconds or more after engine switch is turned on (IG)* | CAN communication system |
| U016487 | Lost Communication with HVAC Control Module Missing Message | Stereo component equalizer assembly detects CAN communication malfunction in the air conditioning system for 25 seconds or more continuously 3 seconds after the engine switch is turned on (IG)* | CAN communication system |
HINT:
*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.
- After engine switch is turned on (ACC) for 3 seconds or more.
- After the battery voltage returns to normal for 3 seconds.
- Before 3 seconds have elapsed after battery voltage has returned to normal.
PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Active Noise Control > Clear DTCs
|
| 2. | CHECK FOR DTC |
(a) Check for DTCs with all of the detection conditions met.
Body Electrical > Active Noise Control > Trouble CodesOK:
No DTCs are output.
HINT:
- If CAN communication system malfunction DTCs are output, they may also be output for other systems.
- If the CAN communication system has been checked and repaired in other systems, the DTC will not be output after rechecking for DTCs.
-
If the DTC is output frequently, duplicate the conditions that cause a malfunction and perform the check again, even though the DTC was not output after rechecking for DTCs.
Click here
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| OK |  | USE SIMULATION METHOD TO CHECK |
| NG | | GO TO CAN COMMUNICATION SYSTEM |
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SEE MORE:
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 suspect
Inspection
INSPECTION PROCEDURE 1. INSPECT TURN SIGNAL SWITCH (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Light Control Switch Tester Connection Condition Specified Condition
*1: w/ Light Control Switch DRL OFF Position
2 (L_OFF) - 12 (EL)
