Ford Corsar Repair Manual page 280

TROUBLE DIAGNOSES
/
KA24EI
How to Perform Trouble Diagnoses for Quick and Accurale Repair (Cont'd)
KEY POINTS
WHAT
.....
Vehicle& engine model
WHEN
.....
Date, Frequencies
WHERE
.....
Road conditions
H W
.....
Operating conditions,
Weather conditions,
Symptoms
DIAGNOSTIC WORKSHEET
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
p i d e n t Date
Customer name MRlMS
Engine
#
Manuf. Date
In Service Date
Model & Year
Trans.
I
1
I
I
lmpossible to start
No combustion Cl Partial combustion
VIN
Mileage
Symptoms
L
I
Incident occurrence
Idling
Startability
No fast idle U Unstable High idle
D Low idle
Others [
1
Partial combustion affected by throttle position
Cl Partial combustion NOT affected by throttle position
Cl Possible but hard to start Others [
1
1
I
Stumble Surge C l Detonation Lack of power
I
Engine stall
I
While accelerating While decelerating
Driveability
I
I
Just after stopping While loading
Intake backfire,
Exhaust backfire
Others [
1
At the time of start While idling
Just after delivery Recently
Cl In the morning
D At night
In the daytime
Frequency
Weather conditions
Engine conditions
All the time Under certain conditions Sometimes
D Note effected
-
Weather
,
Temperature
R
+p-
Cl Cold During warm-up
D After warm-up
I
Fine Raining Snowing Others [
l
Hot Warm Cool
U Cold U Humid "F
Engine speed
,
1
I
I
1
I
I
I
0 2 .OOO
4.000 6,000 8,000 rom
I
Road conditions
Driving conditions
\
In town Oln suburbs
5
Highway Cl Off road (upldown)
Not affected
Cl At starting U While idling O At racing
While accelerating
'
U While cruising
While decelerating ! l While turning (RHILH)
Vehiclespeedj
,
I I
,
I
l
.
I
J
0 2 0 4 0 6 0 8 0 1 0 0 120KPH
P -
ECM light Turned on Not turned on
I
h