Toyota Tacoma 2015-2018 Service Manual: Lost Communication With ECM/PCM "A" Missing Message (U010087)

Toyota Tacoma 2015-2018 Service Manual / Rc62f Manual Transmission / Transaxle / Manual Transmission System / Lost Communication With ECM/PCM "A" Missing Message (U010087)

DESCRIPTION

The engine control unit and transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control ECU via CAN communication. If there is a problem in this intercommunication, the ECM stores this DTC.

DTC Code	DTC Detection Condition	Trouble Area	SAE
U010087	Following conditions are met for 1.25 seconds (1 trip detection logic): The ignition switch is ON Battery voltage is 9.5 V or more No communication between engine control unit and transmission control unit	ECM	U0100

CAUTION / NOTICE / HINT

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Check that the battery voltage is 9.5 V or more.
Turn the ignition switch to ON.
Check for DTCs again (See page ).

PROCEDURE

1.	CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U010087)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Check if DTCs are output.

Result

Result	Proceed to
Only DTC U010087 is output	A
DTC U010087 and other DTCs are output	B

REPLACE ECM

GO TO DTC CHART

Diagnostic Trouble Code Chart

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Other materials:

Installation
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Operation Check
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Engine Immobiliser System Malfunction (B2799,B279986)
DESCRIPTION This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communication with the transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the transponder key ECU assembly and ECM is d ...