How to Perform Trouble Diagnoses for Quick and Accurate Repair (Cont'd) - DIAGNOSTIC WORKSHEET
EF & EC-236prose procedureGA16DE engine page (header marked GA16DE).
DIAGNOSTIC WORKSHEET
| Specification | Value |
|---|---|
| WHATKEY POINTS | Vehicle & engine model |
| WHENKEY POINTS | Date, Frequencies |
| WHEREKEY POINTS | Road conditions |
| HOWKEY POINTS | Operating conditions, Weather conditions, Symptoms |
WHATKEY POINTS
Vehicle & engine model
WHENKEY POINTS
Date, Frequencies
WHEREKEY POINTS
Road conditions
HOWKEY POINTS
Operating conditions, Weather conditions, Symptoms
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
Diagnostic Worksheet
Customer name MR/MS
ItemModel & Year
Options / FieldsVIN
Engine #
ItemTrans.
Options / FieldsMileage
Incident Date
ItemManuf. Date
Options / FieldsIn Service Date
Symptoms
ItemStartability
Options / FieldsImpossible 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
ItemIdling
Options / FieldsNo fast idle; Unstable; High idle; Low idle; Others [ ]
Symptoms
ItemDriveability
Options / FieldsStumble; Surge; Detonation; Lack of power; Intake backfire; Exhaust backfire; Others [ ]
Symptoms
ItemEngine stall
Options / FieldsAt the time of start; While idling; While accelerating; While decelerating; Just after stopping; While loading
Incident occurrence
Item
Options / FieldsJust after delivery; Recently; In the morning; At night; In the daytime
Frequency
Item
Options / FieldsAll the time; Under certain conditions; Sometimes
Weather conditions
Item
Options / FieldsNot affected
Weather conditions
ItemWeather
Options / FieldsFine; Raining; Snowing; Others [ ]
Weather conditions
ItemTemperature
Options / FieldsHot; Warm; Cool; Cold; Humid ( °F)
Engine conditions
Item
Options / FieldsCold; During warm-up; After warm-up
Engine conditions
ItemEngine speed
Options / Fields0 / 2,000 / 4,000 / 6,000 / 8,000 rpm
Road conditions
Item
Options / FieldsIn town; In suburbs; Highway; Off road (up/down)
Driving conditions
Item
Options / FieldsNot affected; At starting; While idling; At racing; While accelerating; While cruising; While decelerating; While turning (RH/LH)
Driving conditions
ItemVehicle speed
Options / Fields0 / 10 / 20 / 30 / 40 / 50 / 60 MPH
Check engine light
Item
Options / FieldsTurned on; Not turned on