Toyota Tacoma (2015-2018) Service Manual: Problem Symptoms Table

Toyota Tacoma (2015-2018) Service Manual / Can Communication / Can Communication System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
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.
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Result List of How to Proceed with Troubleshooting

Symptom	Suspected Area	Link
The result of "How to Proceed with Troubleshooting" is "Open in Bus 2 Main Bus Line".	Open in Bus 2 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 2 Lines".	Short in Bus 2 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 2 Line".	Short to +B in Bus 2 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 2 Line".	Short to GND in Bus 2 Line
The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 2 Branch Line".	Open in One Side of Bus 2 Branch Line
The result of "How to Proceed with Troubleshooting" is "Open in Bus 3 Main Bus Line".	Open in Bus 3 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 3 Lines".	Short in Bus 3 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 3 Line".	Short to +B in Bus 3 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 3 Line".	Short to GND in Bus 3 Line
The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 3 Branch Line".	Open in One Side of Bus 3 Branch Line
The result of "How to Proceed with Troubleshooting" is "Open in Bus 5 Main Bus Line".	Open in Bus 5 Main Bus Line
The result of "How to Proceed with Troubleshooting" is "Short in Bus 5 Lines".	Short in Bus 5 Lines
The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 5 Line".	Short to +B in Bus 5 Line
The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 5 Line".	Short to GND in Bus 5 Line
The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 5 Branch Line".	Open in One Side of Bus 5 Branch Line

HINT:

Refer to How to Proceed with Troubleshooting for the Bus Check procedure.
The suspected communication stop area can be determined based on the ECU or sensor that was not displayed in CAN Bus Check and by referring to the following table.

Communication Stop Mode Table

Symptom	Suspected Area	Link
Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the Techstream.	Skid Control ECU Communication Stop Mode
Communication stop for "Clearance Warning (Clearance Sonar)" is indicated on the "Communication Bus Check" screen of the Techstream.*1	Clearance Warning ECU Communication Stop Mode
Communication stop for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check" screen of the Techstream.	Air Conditioner Amplifier Communication Stop Mode
Communication stop for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check" screen of the Techstream.	Steering Angle Sensor Communication Stop Mode
Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the Techstream.	ECM Communication Stop Mode
Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the Techstream.	Main Body ECU Communication Stop Mode
Communication stop for "Combination Meter" is indicated on the "Communication Bus Check" screen of the Techstream.	Combination Meter ECU Communication Stop Mode
Communication stop for "Certification (Smart)" is indicated on the "Communication Bus Check" screen of the Techstream.*2	Certification ECU Communication Stop Mode
Communication stop for "Airbag" is indicated on the "Communication Bus Check" screen of the Techstream.	Center Airbag Sensor Communication Stop Mode
Communication stop for "Four Wheel Drive Control" is indicated on the "Communication Bus Check" screen of the Techstream.*3	4WD Control ECU Communication Stop Mode
Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the Techstream.*4	Radio Receiver Assembly Communication Stop Mode
Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the Techstream.*5	Navigation Receiver Assembly Communication Stop Mode
Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the Techstream.*6	Blind Spot Monitor Sensor Communication Stop Mode
Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the Techstream.*7	Millimeter Wave Radar Sensor Communication Stop Mode
Communication stop for "Front Camera Module" is indicated on the "Communication Bus Check" screen of the Techstream.*7	Front Camera Module Communication Stop Mode
Communication stop for "Tire Pressure2" is indicated on the "Communication Bus Check" screen of the Techstream.*8	Tire Pressure Monitor ECU Communication Stop Mode

*1: w/ Intuitive Parking Assist System
*2: w/ Smart Key System
*3: for 4WD
*4: for Radio and Display Type
*5: for Navigation Receiver Type
*6: w/ Blind Spot Monitor System
*7: w/ Toyota Safety Sense P
*8: w/ Tire Pressure Warning System and Tire Inflation Pressure Display Function

DTC Combination Table

Symptom	Suspected Area	Link
Although CAN communication is currently normal, ECUs connected to the bus 2, bus 3 and bus 5 store CAN communication DTCs.	The probable part for which communication is interrupted can be determined using DTC Combination Table and comparing the DTCs output from ECUs connected to the CAN communication system.

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 ...

System Description

SYSTEM DESCRIPTION 1. BRIEF DESCRIPTION (a) The Controller Area Network (CAN) is a serial data communication system for real time application. It is a vehicle multiplex communication system which ...

Other materials:

Rear Left Center Sensor Malfunction (C1AE7)
DESCRIPTION The No. 1 ultrasonic sensor (rear center sensor LH) is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 1 ultrasonic sensor (rear center sensor LH). If the No. 1 ultrasonic sensor (rear center sensor LH) has an open circuit or other ma ...

Transponder Chip Malfunction (B2793,B2794,B2797,B2798)
DESCRIPTION DTC B2793 is stored when a malfunction is found in the key during key code registration or a key code is not registered normally. Replace the key if key code registration cannot be performed normally and this DTC is output. DTC B2794 is stored when a key with an i ...

Removal
REMOVAL CAUTION / NOTICE / HINT HINT: If the bumper is damaged, there is a possibility that the installation area of the blind spot monitor sensor may be deformed and the blind spot monitor system may not operate correctly, so visually inspect the blind spot monitor sensor installation area ...