Toyota Yaris: Lin Communication System / How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
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Use the following procedure to troubleshoot the LIN communication system.
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*: Use the GTS.
PROCEDURE
1. | VEHICLE BROUGHT TO WORKSHOP |
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2. | CUSTOMER PROBLEM ANALYSIS |
HINT:
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In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
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Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
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The following 5 items are important points for problem analysis:
What | Vehicle model, system name |
When | Date, time, occurrence frequency |
Where | Road conditions |
Under what conditions? | Driving conditions, weather conditions |
How did it happen? | Problem symptoms |
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(a) Measure the auxiliary battery voltage with the ignition switch off.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.
(b) Check the fuses and relays.
(c) Check the connectors and terminals to make sure that there are no abnormalities such as a loose connection or deformation.
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4. | INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* |
(a) Using the GTS, check for CAN communication system DTCs.
Click here
Result | Proceed to |
CAN DTCs are not output | A |
CAN DTCs are output | B |
B |
| GO TO CAN COMMUNICATION SYSTEM |
A |
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5. | INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* |
(a) Using the GTS, check for LIN communication system DTCs.
Click here
Result | Proceed to |
LIN DTCs are not output | A |
LIN DTCs are output | B |
B |
| GO TO DIAGNOSTIC TROUBLE CODE CHART |
A |
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6. | OVERALL ANALYSIS AND TROUBLESHOOTING* |
(a) Terminals of ECU
Click here
(b) Data List / Active Test
Click here
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SYSTEM DESCRIPTION LIN COMMUNICATION SYSTEM DESCRIPTION The LIN communication system is used for communication between the components in the tables below...
TERMINALS OF ECU CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*1 POWER DISTRIBUTION BOX ASSEMBLY *2 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Remove main body ECU (multiplex network body ECU)...
Other information:
DESCRIPTION While the engine is being cranked, current flows from terminal STAR of the certification ECU (smart key ECU assembly) to the clutch start switch assembly and to terminal STA of the ECM (STA signal). WIRING DIAGRAM Refer to DTC P061512. Click here
CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure...
DESCRIPTION If the airflow from the front registers is weak regardless of the blower speed setting displayed on the air conditioning control assembly, the following factors may be the cause. Symptom Factor
Airflow volume is constantly low
Airflow volume sometimes becomes low
ECO mode control of air conditioning system is enabled
Harness or connector
Air conditioning amplifier assembly
Blower motor with fan sub-assembly malfunction
Clogged clean air filter
Clogged No...
Categories
Before refueling, close all the doors, windows, and the liftgate/trunk
lid, and switch the ignition OFF.
To open the fuel-filler lid, pull
the remote fuel-filler lid release.

To remove the fuel-filler cap, turn it counterclockwise.
Attach the removed cap to the
inner side of the fuel-filler lid.
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