Toyota Avalon Service & Repair Manual: Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087)

Toyota Avalon Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Active Noise Control System / Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087)

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

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
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC U010087, U012987 and U014087 are not 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

OK

USE SIMULATION METHOD TO CHECK

NG

GO TO CAN COMMUNICATION SYSTEM

    Terminals Of Ecu

    Amplifier Antenna

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