Trouble Diagnoses - How to Perform Trouble Diagnoses for Quick and Accurate Repair (Cont'd) - Diagnostic Worksheet
EF & EC-35prose procedureHow to Perform Trouble Diagnoses for Quick and Accurate Repair (Cont'd)
DIAGNOSTIC WORKSHEET
NOTE
There are many kinds of operating conditions that lead to malfunctions on engine components.
A good grasp of such conditions can make trouble-shooting faster and more accurate.
In general, feelings for a problem depend on each customer. It is important to fully understand the symptoms or under what conditions a customer complains.
Make good use of a diagnostic worksheet such as the one shown below in order to utilize all the complaints for trouble-shooting.
Worksheet sample
Customer name MR/MS
Value
Model & Year
Value
VIN
Value
Engine #
Value
Trans.
Value
Mileage
Value
Incident Date
Value
Manuf. Date
Value
In Service Date
Value
Symptoms - Startability
ValueImpossible to start / No combustion / Partial combustion / Partial combustion affected by throttle position / Partial combustion NOT affected by throttle position / Possible but hard to start / Others
Symptoms - Idling
ValueNo fast idle / Unstable / High idle / Low idle / Others
Symptoms - Driveability
ValueStumble / Surge / Detonation / Lack of power / Intake backfire / Exhaust backfire / Others
Symptoms - Engine stall
ValueAt the time of start / While idling / While accelerating / While decelerating / Just after stopping / While loading
Incident occurrence
ValueJust after delivery / Recently / In the morning / At night / In the daytime
Frequency
ValueAll the time / Under certain conditions / Sometimes
Weather conditions - Weather
ValueNot affected / Fine / Raining / Snowing / Others
Weather conditions - Temperature
ValueHot / Warm / Cool / Cold / Humid (deg.F)
Engine conditions
ValueCold / During warm-up / After warm-up / Engine speed 0, 2,000, 4,000, 6,000, 8,000 rpm
Road conditions
ValueIn town / In suburbs / Highway / Off road (up/down)
Driving conditions
ValueNot affected / At starting / While idling / At racing / While accelerating / While cruising / While decelerating / While turning (RH/LH) / Vehicle speed 0, 10, 20, 30, 40, 50, 60 mph
Check engine light
ValueTurned on / Not turned on