Toyota Tundra (2015 year). Manual - part 3
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(a) Adjust, repair or replace the malfunctioning circuit or parts.
9.
CONFIRMATION TEST
(a) After the adjustment, repairs or replacement, confirm that the malfunction no longer exists. If the
malfunction does not reoccur, perform a confirmation test under the same conditions and in the same
environment as when the malfunction occurred the first time.
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2. CUSTOMER PROBLEM ANALYSIS
HINT:
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.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in
some cases.
The following 5 questions are important points in the problem analysis:
What
Vehicle model, system name
When
Date, time, occurrence frequency
Where
Road conditions
Under what conditions?
Running conditions, driving conditions, weather conditions
How did it happen?
Problem symptoms
3. SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system in the TOYOTA TUNDRA has various functions.
The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU memory
whenever a malfunction in the signal circuits to the ECU occurs. In a DTC check, a previous malfunction's
DTC can be checked by a technician during troubleshooting.
Another function is the Input Signal Check, which checks if the signals from various switches are sent to
the ECU correctly.
By using these functions, the problem areas can be narrowed down and troubleshooting is more
effective. Diagnostic functions are incorporated in the following systems in the TOYOTA TUNDRA.
SYSTEM
DTC
CHECK
(NORMAL
MODE)
DTC
CHECK
(CHECK
MODE)
FREEZE
FRAME
DATA
SENSOR
CHECK / TEST
MODE (INPUT
SIGNAL
CHECK)
DATA
LIST
ACTIVE
TEST
CUSTOMIZE
PARAMETER