Toyota Tacoma (2015-2018) Service Manual: 4WD Control ECU Communication Stop Mode

Toyota Tacoma (2015-2018) Service Manual / Can Communication / Can Communication System / 4WD Control ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
4WD Control ECU Communication Stop Mode	Either condition is met: Communication stop for "Four Wheel Drive Control" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication system DTCs (DTCs that start with U) that correspond to "4WD Control ECU Communication Stop Mode" in "DTC Combination Table" are output. Click here	4 wheel drive control ECU branch line or connector Power source circuit of 4 wheel drive control ECU 4 wheel drive control ECU ground circuit 4 wheel drive control ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
Click here
Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
Click here
Some parts must be initialized and set when replacing or removing and installing parts.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	CHECK FOR OPEN IN CAN BUS LINES (4 WHEEL DRIVE CONTROL ECU BRANCH LINE)

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the 4 wheel drive control ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F13-20 (CANH) - F13-40 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Text in Illustration

*a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (4 WHEEL DRIVE CONTROL ECU)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the 4 wheel drive control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F12-10 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F13-21 (+B) - Body ground	Always	11 to 14 V
F12-4 (IG) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

REPLACE 4 WHEEL DRIVE CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Combination Meter ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Combination Meter ECU Communication Stop Mode Either condition is met: Commu ...

Blind Spot Monitor Sensor Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Blind Spot Monitor Sensor Communication Stop Mode Either Condition is met: C ...

Other materials:

Charging Failure
PROCEDURE 1. CHECK GENERATOR PULLEY WITH CLUTCH (ON-VEHICLE INSPECTION) (a) Start the engine and visually check if the fan of the generator rotor assembly located inside the generator assembly is operating. OK: The fan of the generator rotor assembly is operati ...

Installation
INSTALLATION CAUTION / NOTICE / HINT CAUTION: Wear protective gloves. Sharp areas on the parts may injure your hands. HINT: Use the same procedure for both the RH and LH sides. The procedure described below is for the LH side. PROCEDURE 1. INSTALL FRONT SEAT AIRBAG ASSEMBLY ...

System Description
SYSTEM DESCRIPTION 1. WIRELESS DOOR LOCK CONTROL SYSTEM The wireless door lock control system can be used to lock and unlock all doors from a distance. The system is controlled by an electrical key transmitter sub-assembly which sends radio waves to the door control receiver. The certification ...