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Toyota Corolla Repair Manual: Symptom confirmation and diagnostic trouble code

Toyota Corolla Repair Manual / Introduction / How to troubleshoot ecu controlled systems / Symptom confirmation and diagnostic trouble code

Hint

:

System

Diagnostic trouble code check

Input signal check (sensor check)

Diagnostic test mode (active test)

Sfi system check mode)

(With check mode)

Abs with ebd system    
Electronic controlled automatic transaxle [ect] check mode)

(With check mode)

   
Supplemental restraint system      
Cruise control system      

1 Dtc check

2 Making a note and clear the dtcs

2 Making a note and clear the dtcs

3 Symptom confirmation

3 Symptom confirmation

Problem symptoms exist Problem symptoms exist
No problem symptoms exist No problem symptoms exist

A go to step 5

B

4 Simulation test using the symptom simulation methods

5 Dtc check

5 Dtc check

Dtc displayed Dtc displayed
Normal code displayed Normal code displayed

A troubleshooting of problem indicated by dtc

B

6 Symptom confirmation

No problem symptoms exist No problem symptoms exist
Problem symptoms exist Problem symptoms exist

If a dtc is displayed in the initial dtc check, it indicates that a trouble may have occurred in a wire harness or connector in that circuit in the past, therefore check the wire harness and connectors .

A system normal

B

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 it is a secondary problem).

Customer problem analysis
Hint: in troubleshooting, the problem symptoms must be confirmed accurately, meaning that all preconceptions must be set aside in order to make an accurate judgement. To ascertain what the ...

Symptom simulation
Hint: the most difficult case in troubleshooting is when no symptoms occurs. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and envi ...

Other materials:

Chassis
Onvehicle inspection 1. Inspect steering linkage  check the steering wheel freeplay .  check the steering linkage for looseness or damage.  Check that the tie rod ends do not have excessive play.  Check that the dust seals and boots are not damaged.  Check ...

Onvehicle inspection
1. Check battery electrolyte level Check the electrolyte quantity of each cell (maintenancefree battery).  If under the lower level, replace the battery (or add distilled water if possible) and check the charging system.  check the electrolyte quantity of each cell (e ...

Air outlets
■ Location of air outlets The air outlets and air volume changes according to the selected airflow mode. : Some models ■ Adjusting the position of and opening and closing the air outlets ► Front center outlets Direct air flow to the left or right, up or down. ► Fro ...

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