Toyota Tacoma (2015-2018) Service Manual: Precaution

Toyota Tacoma (2015-2018) Service Manual / Can Communication / Can Communication System / Precaution

PRECAUTION

1. EXPRESSIONS OF IGNITION SWITCH

HINT:

The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.

Expression	Ignition Switch (Position)	Engine Switch (Condition)
Ignition Switch off	LOCK	Off (Lock)
Ignition Switch ACC	ACC	On (ACC)
Ignition Switch ON	ON	On (IG)
Engine Start	START	On (Start)

2. CAN COMMUNICATION SYSTEM TROUBLESHOOTING

(a) 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 3. PRECAUTION FOR STEERING SYSTEM HANDLING

3. PRECAUTION FOR STEERING SYSTEM HANDLING

(a) Be careful when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.

4. PRECAUTION FOR SRS AIRBAG SYSTEM HANDLING

(a) This vehicle is equipped with a Supplemental Restraint System (SRS) which includes parts such as airbags for the driver and front passenger. Failure to carry out service operations in the correct sequence could cause unexpected SRS deployment during servicing and may cause a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read Precaution for SRS.

Click here 5. BUS LINE REPAIR

5. BUS LINE REPAIR

(a) After repairing a bus line with solder, wrap the repaired part with electrical tape.

NOTICE:

The CANL bus line and CANH bus line must be installed together at all times.
When installing, make sure that these lines are twisted, because CAN bus lines are likely to be influenced by electrical noise if the bus lines are not twisted.
Leave approximately 80 mm (3.15 in.) loose in the twisted wires around the connector.
When repairing the CAN bus lines, do not change the length of the lines. (Make sure that the length of the CANH bus line and CANL bus line are the same.)

(b) Do not use bypass wiring between connectors.

Text in Illustration

*a	Bypass Wire

NOTICE:

The ability of the twisted bus lines to resist interference will be lost if bypass wiring is used.
Do not use a twisted pair of wires for bypass wiring.

6. CONNECTOR HANDLING

(a) When checking resistance with a tester, insert the tester probes from the backside (harness side) of the connector.

Text in Illustration

*a	Tester Probe

(b) Use service wires to check the connector if it is impossible to check continuity from the rear of the connector.

Text in Illustration

*a	Service Wire

7. PRECAUTIONS FOR INSPECTING OR REPLACING CAN JUNCTION CONNECTOR

(a) If the CAN junction connector is removed from the vehicle for inspection or replacement, make sure to install the CAN junction connector and all wire harnesses to their original locations with tape and the clamps.

8. PRECAUTIONS WHEN REPLACING A GATEWAY FUNCTION EQUIPPED ECU (SUB BUS MONITOR ECU OR CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) WITH A USED ONE FROM ANOTHER VEHICLE

(a) When a gateway function equipped ECU (main body ECU (multiplex network body ECU) or central gateway ECU (network gateway ECU)) that was previously installed on another vehicle is used as a replacement part, it is necessary to initialize the connection information stored in the ECU.

Click here NOTICE:

NOTICE:

If the connection information stored in a gateway function equipped ECU that was previously installed on another vehicle is different from the actual ECUs and sensors connected to the corresponding bus, communication DTCs will be detected.

HINT:

It is not necessary to perform initialization of a gateway monitoring ECU (sub bus monitoring ECU) when using a sub bus monitoring ECU which was installed to another vehicle with the same sub bus configuration.

9. PRECAUTIONS FOR WHEN GATEWAY FUNCTION EQUIPPED ECU (SUB BUS MONITOR ECU OR CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) DETECTS COMMUNICATION DTCS FOR ECUS NOT CONNECTED TO THE ECU

(a) Refer to Precautions When Replacing a Gateway Function Equipped ECU (Sub Bus Monitor ECU or Central Gateway ECU (Network Gateway ECU)) with a Used One from Another Vehicle and initialize the connection information of the ECU.

(b) Clear the DTCs and check that no DTCs are output.

10. DIFFERENCE BETWEEN GENUINE NAVIGATION RECEIVERS/RADIO AND DISPLAY RECEIVERS AND OPTIONAL NAVIGATION RECEIVERS/RADIO AND DISPLAY RECEIVERS

(a) Some optional navigation receivers/radio and display receivers are available as CAN compatible devices. Be aware that some optional navigation receivers/radio and display receivers do not have the same diagnostic features or characteristics of genuine navigation receivers/radio and display receivers.

NOTICE:

Optional navigation receivers/radio and display receivers receive data from the CAN communication system. However, most optional navigation receivers/radio and display receivers do not send signals to the CAN bus main line.
Optional navigation receivers/radio and display receivers will not be displayed on the "CAN Bus Check" screen of the Techstream.
When checking for DTCs using the Techstream, DTCs for optional navigation receivers/radio and display receivers will not be displayed on the Techstream.

Parts Location

PARTS LOCATION ILLUSTRATION *A for Hydraulic Brake Booster *B for Vacuum Brake Booster *C w/ Toyota Safety Sense P ...

System Diagram

SYSTEM DIAGRAM 1. OVERALL CAN BUS DIAGRAM (a) The CAN communication system is composed of 4 buses. CAN Main Bus Line Terminating Resistor ...

Other materials:

Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. Click here IGNITION SWITCH EXPRESSIONS (a) The type of ignition switch ...

ECM Communication Circuit Malfunction (C1203)
DESCRIPTION The circuit is used to send TRAC and VSC control information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the ECM to the skid control ECU (brake actuator assembly) through the CAN communication system. for 4WD or w/ Rear Diff ...

Voice Guidance does not Function
PROCEDURE 1. CHECK VOICE GUIDANCE SETTING (a) Check that the voice guidance settings are not off. OK: Voice guidance settings are not off. NG CHANGE VOICE GUIDANCE SETTINGS TO ON OK ...