Customer Problem Analysis; Erence - Toyota 1KZ-TE Repair Manual

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1 . CUS TO ME R P RO BLE M ANALY S I S
In troubleshooting, the problem symptoms must be confirmed accurately and all preconceptions must be
cleared away in order to give an accurate judgement. To ascertain just what the problem symptoms are, it
is extremely important to ask the customer about the problem and the conditions at the time it occurred.
Important Point in the Problem Analysis:
The following 5 items are important points in the problem analysis. Past problems which are thought to be
unrelated and the repair history, etc. may also help in some cases, so as much information as possible should
be gathered and its relationship with the problem symptoms should be correctly ascertained for reference
in troubleshooting. A customer problem analysis table is provided in the troubleshooting section for each
system for your use.
Important Points in the Customer Problem Analysis
D What ---------- Vehicle model, system name
D When ---------- Date, time, occurrence frequency
D Where ---------- Road conditions
D Under what conditions? ---------- Running conditions, driving conditions, weather conditions
D How did it happen? ---------- Problem symptoms
(Sample) Engine control system check sheet.
CUSTOMER PROBLEM ANALYSIS CHECK
ENGINE CONTROL SYSTEM Check Sheet
Customer's Name
Driver's Name
Data Vehicle
Brought in
License No.
Engine does
not Start
Difficult to
Start
Poor Idling
Poor
Drive ability
Engine Stall
Others
Datas Problem
INTRODUCTION
Engine does not crank
Engine cranks slowly
Other
Incorrect first idle Idling rpm is abnormal
Rough idling Other
Hesitation Back fire
Knocking Other
Soon after starting After accelerator pedal depressed
After accelerator pedal released
Shifting from N to D
Constant Sometimes (
- - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
Inspector's
Name
Model and Model
Year
Frame No.
Engine Model
Odometer Reading
No initial combustion
High (
Muffler explosion (after- - fire)
During A/C operation
Other
times per day/month)
1KZ-TE Pages From Manual
TO MODEL INDEX
IN- -11
km
miles
No complete combustion
rpm) Low ( rpm)
Surging
CONTINUED