Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Toyota vehicle intrusion protection system / How to proceed with troubleshooting
Toyota Corolla (E120): How to proceed with troubleshooting
Troubleshoot in accordance with the procedure on the following pages.
1 Vehicle brought to workshop
2 Customer problem analysis check and symptom check
- Without applicable symptoms, proceed to ”a”.
- with applicable symptoms, proceed to ”b”.
3 Symptom simulation
4 Problem symptoms table
- Without applicable symptoms, proceed to ”a”.
- with applicable symptoms, proceed to ”b”.
5 Circuit inspection and part inspection
6 Perform troubleshooting in the following method, depending on malfunction symptom
- Terminals of ecu (seepage 05–703)
- on–vehicle inspection
7 Adjustment, repair or replacement
8 Confirmation test
End
Customer problem analysis check
Location
Other materials:
Circuit description
The vapor pressure sensor and the vsv for the canister closed valve (ccv) are
used to detect abnormalities
in the evaporative emission control system. The ecm decides whether there is an
abnormality in the evaporative
emission control system based on the vapor pressure sensor signal.
Dtc p0 ...
Sound quality is bad in all modes (volume is too low)
Wiring diagram
Inspection procedure
1 Adjust sound quality
Adjust the sound quality.
Operate the radio receiver assy to adjust the sound quality.
Standard: malfunction disappear.
2 Compare it with another car of same model
Compare it with another vehicle of the same mo ...
Symptom confirmation and diagnostic trouble code
Hint:
the diagnostic system in corolla has various functions. The first
function is the diagnostic trouble
code (dtc) check, in which a malfunction in the signal circuits to the ecu
is stored in code form in
the ecu memory. Another function is the input signal check, which checks if
...