Toyota Highlander manuals

Toyota Highlander Service Manual: Symptom confirmation and diagnostic trouble code

HINT: The diagnostic system in the HIGHLANDER has various functions.

Symptom confirmation and diagnostic trouble code


1 DTC CHECK

2 MAKE A NOTE OF DTCS DISPLAYED AND THEN CLEAR THE MEMORY

3 SYMPTOM CONFIRMATION

a Symptoms exist
b No symptoms exist

4 SIMULATION TEST USING THE SYMPTOM SIMULATION METHODS

5 DTC CHECK

a DTC displayed
b No DTC displayed

6 SYMPTOM CONFIRMATION

a No symptoms exist
b Symptoms exist

If a DTC was displayed in the initial DTC check, it indicates that the trouble may have occurred in a wire harness or connector in that circuit in the past. Check the wire harness and connectors (see page 01-36 ).

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).

Customer problem analysis
HINT: In troubleshooting, the problem symptoms must be confirmed accurately. Preconceptions should be discarded in order to give an accurate judgement. To clearly understand what the probl ...

Symptom simulation
HINT: The most difficult case in troubleshooting is when no problem symptoms occur. In such cases, a thorough customer problem analysis must be carried out. A simulation of the same or similar c ...

More about Toyota Highlander:

Front seats
Adjustment procedure Manual seat Seat position adjustment lever Seatback angle adjustment lever Vertical height adjustment lever (drivers side only) Power seat Seat position adjustment switch seatback angle adjustment switch seat cushion (front) angle adj ...

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