Toyota Tundra (2015 year). Manual — part 4
A
RESULT
PROCEED TO
DTC is not output
A
DTC is output
B
B
TROUBLESHOOTING OF PROBLEM INDICATED BY
DTC
6.
SYMPTOM CONFIRMATION
Result
RESULT
PROCEED TO
Symptoms exist
A
No symptoms exist
B
If a DTC was displayed in the initial DTC check, the problem may have occurred in a wire harness or connector in
that circuit in the past. Check the wire harness and connectors.
B
SYSTEM NORMAL
A
TROUBLESHOOTING OF EACH PROBLEM SYMPTOM
The problem is still occurring in a place other than the diagnostic circuit (the DTC displayed first is either for a
past problem or a secondary problem).
4. SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no problem symptoms occur. In such a case, a thorough
vehicle or on a vehicle with a warmed-up engine. Vibration, heat or water penetration (moisture) is difficult
to reproduce. The symptom simulation tests below are effective substitutes for the conditions and can be
applied on a stationary vehicle.
Important points in the symptom simulation test:
In the symptom simulation test, the problem symptoms as well as the problem area or parts must be
confirmed. First, narrow down the possible problem circuits according to the symptoms. Then, connect the
tester and carry out the symptom simulation test, judging whether the circuit being tested is defective or
normal. Also, confirm the problem symptoms at the same time. Refer to the problem symptoms table for
each system to narrow down the possible causes.
To reproduce DTCs, it is necessary to satisfy the respective DTC detection conditions.
(a) VIBRATION METHOD:
whether or not the malfunction occurs.
NOTICE:
Applying strong vibration to relays may open them.
(2) CONNECTORS
Slightly shake the connector vertically and horizontally.
(3) WIRE HARNESS
Slightly shake the wire harness vertically and horizontally.
HINT:
(b) HEAT METHOD:
When a malfunction seems to occur when the area in question is heated.
NOTICE:
Do not heat to more than 60°C (140°F). Exceeding this temperature may damage components.
Do not apply heat directly to the parts in the ECU.
(c) WATER SPRINKLING METHOD:
When a malfunction seems to occur on a rainy day or in
high-humidity.
(1) Sprinkle water onto the vehicle and check if the malfunction
occurs.
NOTICE:
If the vehicle has or had a water leakage problem, the leakage
may have damaged the ECU or connections. Look for evidence of
corrosion or short circuits. Proceed with caution during water
tests.
(d) HIGH ELECTRICAL LOAD METHOD:
When a malfunction seems to occur when the electrical load is
excessive.
(1) Turn on the heater blower, headlights, rear window defogger
and all other electrical loads. Check if the malfunction
reoccurs.
5. DIAGNOSTIC TROUBLE CODE CHART
Look for output Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the appropriate section's Diagnostic
Trouble Code Chart. Use the chart to determine the trouble area and the proper inspection procedure. A
DESCRIPTION
DTC Code
Indicates the diagnostic trouble code.
Detection
Item
See Page
Indicates the page where the inspection procedures for each circuit can be found, or where there
are instructions for checks and repairs.
6. PROBLEM SYMPTOMS TABLE
When a "Normal" code is output during a DTC check but the problem is still occurring, use the Problem
Symptoms Table. The suspected areas (circuits or parts) for each problem symptom are in the table. The
In some cases, the problem is not detected by the diagnostic system even though a problem symptom is
DESCRIPTION
Symptom
-
Suspected Area
Indicates the circuit or part which needs to be checked.
See Page
Indicates the page where the flowchart for each circuit is located.
7. CIRCUIT INSPECTION
DESCRIPTION
Circuit Description
Detection Condition,
Trouble Area
Indicates the diagnostic trouble codes, diagnostic trouble code detection conditions,
ITEM
DESCRIPTION
Wiring Diagram
understand the circuit.
Inspection Procedures
Use the inspection procedures to determine if the circuit is normal or abnormal. If
abnormal, use the inspection procedures to determine whether the problem is located
in the sensors, actuators, wire harnesses or ECU.
Inspection Procedure
Connector Illustrations
Connector being checked is connected:
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