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Toyota Tundra (2015 year). Manual - part 4

RESULT

PROCEED TO

DTC is not output

DTC is output

TROUBLESHOOTING OF PROBLEM INDICATED BY

DTC

SYMPTOM CONFIRMATION

Result

RESULT

PROCEED TO

Symptoms exist

No symptoms exist

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.

SYSTEM NORMAL

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.

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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