Toyota 1 MZ–FE Manual page 397

EG2–397
1MZ–FE ENGINE – HOW TO PROCEED WITH TROUBLESHOOTING
(6) SETTING CHECK MODE DIAGNOSIS
(7) PROBLEM SYMPTOM CONFIRMATION
If the engine does not start, first carry out steps (10) and (12) while referring to the diagnostic trouble
codes confirmed in step (4) .
(8) SYMPTOM SIMULATION
To find the trouble more quickly, set the diagnosis check to check mode and confirm the problem
symptoms with the higher sensing ability of the ECM. If the trouble does not reappear, use the
symptom simulation method to make sure the trouble can be reproduced.
(9) DIAGNOSTIC TROUBLE CODE CHECK IN CHECK MODE
Check the diagnostic trouble code in check mode. If a malfunction code is output, proceed to step
(11) of the Diagnostic Trouble Code Chart. If a malfunction code is not output, proceed to step (10)
Basic Inspection.
(10) BASIC INSPECTION
Carry out basic inspection such as the spark check and fuel pressure check, etc.
(11) DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed, inspect the circuit indicated by the chart for each code.
(12) MATRIX CHART OF PROBLEM SYMPTOMS
If a diagnostic trouble code is not displayed in the diagnosis in check mode, troubleshoot according
to the inspection order in the Matrix Chart of Problem Symptoms.
(13) CIRCUIT INSPECTION
Determine if the malfunction is in the sensor, actuator, wire harness, connector or the ECM.
(14) PARTS INSPECTION
When the Matrix Chart of Problem Symptoms instructs you to check the parts, refer to the parts
inspection section in this manual.
(15) CHECK FOR INTERMITTENT PROBLEMS
By checking for intermittent problems, you can isolate the place where momentary interruptions or
momentary shorts are occurring due to poor contacts.
(16) ADJUSTMENT, REPAIR
After you locate the cause of the problem, follow the inspection and replacement procedures in this
manual and adjust or repair as necessary.
(17) CONFIRMATION TEST
After completing adjustment or repairs, confirm not only that the malfunction is eliminated, but also
test drive the vehicle, to make sure the entire Engine Control System is operating normally.