Tacoma 4WD L4-2.7L (3RZ-FE) (2004)
Customer Problem Analysis Check
(Sample) Engine control system check sheet
Symptom Confirmation and Diagnostic Trouble Code Check
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE CHECK
The diagnostic system in the TOYOTA TACOMA fulfills various functions. The first function is the Diagnostic Trouble Code Check in which a
malfunction in the signal circuits to the ECU is stored in code in the ECU memory at the time of occurrence, to be output by the technician during
troubleshooting. Another function is the Input Signal Check which checks if the signals from various switches are sent to the ECU correctly. By using
these check functions, the problem areas can be narrowed down quickly and troubleshooting can be performed effectively. Diagnostic functions are
incorporated in the following systems in the TOYOTA TACOMA.