Toyota Tacoma (2015-2018) Service Manual: Lost Communication With ECM/PCM "A" Missing Message (U010087,U010487,U012287)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2gr-fks) / Lost Communication With ECM/PCM "A" Missing Message (U010087,U010487,U012287)

DESCRIPTION

The ECM communicates with each sensor and ECU via CAN communication.

If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL
U010087	Lost Communication With ECM/PCM "A" Missing Message	While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, the ECM continuously receives a communication cut-off signal from the skid control ECU (master cylinder solenoid)1 or skid control ECU (brake actuator assembly)2 for approximately 1 second or more.	CAN communication system ECM Skid control ECU (master cylinder solenoid)1 Skid control ECU (brake actuator assembly)2	Does not come on
U010487	Lost Communication with Cruise Control Module Missing Message	When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication error between the millimeter wave radar sensor assembly and ECM is detected for 1 second or more.	CAN communication system ECM Millimeter wave radar sensor assembly	Does not come on
U012287	Lost Communication with Vehicle Dynamics Control Module Missing Message	When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (master cylinder solenoid)1 or skid control ECU (brake actuator assembly)2 and the ECM is detected for approximately 2.6 seconds or more.	CAN communication system ECM Skid control ECU (master cylinder solenoid)1 Skid control ECU (brake actuator assembly)2	Does not come on

*1: for Hydraulic Brake Booster
*2: for Vacuum Brake Booster

PROCEDURE

1.	CHECK FOR DTCs

(a) Clear the DTCs.

Click here (b) Perform the following procedure.

(b) Perform the following procedure.

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

Turn the ignition switch to ON.
Turn the dynamic radar cruise control system on using the cruise control main switch.
Drive the vehicle at 36 km/h (22 mph) or more for 5 seconds or more.

Click here

Result	Proceed to
DTC U010087, U010487 and U012287 are not output	A
DTC U010087, U010487 or U012287 is output	B

USE SIMULATION METHOD TO CHECK

GO TO CAN COMMUNICATION SYSTEM

Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)

DESCRIPTION The millimeter wave radar sensor assembly and ECM communicate with each sensor and ECU via CAN communication. If any malfunction is detected in a CAN communication circuit, one or more ...

Brake System (P157800)

DESCRIPTION This DTC is stored when a malfunction is detected in the vehicle stability control system. DTC No. Detection Item DTC Detection Condition Tr ...

Other materials:

Transmission Fluid Temperature Sensor "B" Circuit Short to Battery or Open (P274015)
DESCRIPTION The No. 2 ATF temperature sensor is installed in the transmission valve body assembly. If the ECM detects an abnormally high ATF temperature near this sensor, it illuminates the warning indicator. HINT: The temperature of ATF easily rises when towing, climbing hills, in traffic, ...

Replacement
REPLACEMENT PROCEDURE 1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM (a) Start up the engine. (b) Turn the A/C switch to ON. (c) Operate the cooler compressor with an engine speed of approximately 1,000 rpm for 5 to 6 minutes to circulate the refrigerant and collect the compressor oil rem ...

Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART If a DTC is displayed during the DTC check, check the circuit listed for the DTC in the table below (refer to the appropriate page). HINT: When the SRS warning light remains on and the normal system code is output, a decrease in the source voltage is li ...