TROUBLEDIAGNOSIS -General Description
KEY POINTS
WHAT .....Vehicle &engine model
WHEN Date,Frequencies
WHERE Roadconditions
HOW Operatingconditions,
Weather conditions,
Symptoms
SEF907L
WORKSHEET SAMPLE
Diagnostic
Worksheet
There aremany operating conditions thatlead tothe malfunc-
tion ofengine components. Agood grasp ofsuch conditions can
make troubleshooting fasterandmore accurate.
In general, eachcustomer feelsdifferently aboutaproblem. It
is important tofully understand thesymptoms orconditions for
a customer complaint.
Utilize adiagnostic worksheet liketheone shown belowin
order toorganize allthe information fortroubleshooting.
•
Customer name
MR/MS Model
&
Year
.
VIN
Engine
#
Trans. Mileage
Incident Date Manu!.Date InService Date
o
Impossible tostart
o
No combustion
o
Partial combustion
o
Startability
o
Partial combustion affectedbythrottle position
LJ Partial combustion NOTaffected bythrottle position
o
Possible buthard tostart
o
Others [
1
o
Idling
o
No fast idle
o
Unstable
o
High idle
o
Low idle
o
Others [
1
Symptoms
o
Stumble
o
Surge
o
Knock
o
Lack ofpower
o
Driveability
i.J
Intake backfire
o
Exhaust backfire
o
Others [
1
o
At the lime ofstart
o
While idling
[.J
Engine stall
o
While accelerating
o
While decelerating
o
Just after stopping
o
While loading
Incident occurrence
o
Just after delivery
o
Recently
o
Inthe morning
o
At night
o
Inthe daytime
Frequency
o
All the time
o
Under certain conditions
o
Sometimes
Weather conditions
o
Not affected
Weather
o
Fine DRaining
o
Snowing
o
Others [
1
Temperature
o
Hot
o
Warm
o
Cool
o
Cold
o
Humid OF
o
Cold
o
During warm-up
o
After warm-up
Engine conditions
Enginespeed
I
I
I
I
I
I
I
I
I
0 2,000 4,000
6,000 8,000
rpm
Road conditions
o
Intown
o
Insuburbs
o
Highway
o
Off road (up/down)
o
Not affected
o
At starting
o
While idling
o
At racing
o
While accelerating
o
While cruising
Driving conditions
o
While decelerating
o
While turning (RH/LH)
Vehicle speed
I
,
I
I
I III
I
I
I
II
0 10 20 30
40
5060
MPH
Malfunction indicatorlamp
o
Turned on
o
Not turned on
EC-61
TROUBLEDIAGNOSIS -General Description
KEY POINTS
WHAT .....
Vehicle &engine model
WHEN
Date,Frequencies
WHERE Roadconditions
HOW Operatingconditions,
Weather conditions,
Symptoms
SEF907L
WORKSHEET SAMPLE Diagnostic
Worksheet
There aremany operating conditions thatlead tothe malfunc-
tion ofengine components. Agood grasp ofsuch conditions can
make troubleshooting fasterandmore accurate.
In
general, eachcustomer feelsdifferently aboutaproblem. It
is important tofully understand thesymptoms orconditions for
a customer complaint.
Utilize adiagnostic worksheet liketheone shown belowin
order toorganize allthe information fortroubleshooting.
•
Customer name
MR/MS Model
&
Year VIN
Engine
#
Trans. Mileage
Incident Date Manuf.Date InService Date
o
Impossible tostart
o
No combustion
o
Partial combustion
o
Startability
o
Partial combustion affectedbythrottle position
o
Partial combustion NOTaffected bythrottle position
o
Possible buthard tostart
o
Others [
]
o
No fast idle
o
Unstable
o
High idle
o
Low idle
[J
Idling
o
Others [
]
Symptoms
[J
Stumble
o
Surge
o
Knock
o
Lack ofpower
o
Driveability
o
Intake backfire
o
Exhaust backfire
o
Others [
]
o
At the time ofstart
o
While idling
o
Engine stall
o
While accelerating
o
While decelerating
o
Just after stopping
o
While loading
Incident occurrence
o
Just after delivery
o
Recently
o
Inthe morning
o
At night
o
Inthe daytime
Frequency
o
All the time
o
Under certain conditions
o
Sometimes
Weather conditions
o
Not affected
Weather
o
Fine DRaining
o
Snowing
o
Others [
]
Temperature
o
Hot
o
Warm
o
Cool
o
Cold
o
Humid
of
o
Cold
o
During warm-up
o
After warm-up
Engine conditions
Enginespeed
I
I
I
I
I
I
I
I
I
0 2,000 4,000
6,000 8,000rpm
Road conditions
o
Intown
o
Insuburbs
o
Highway
o
Off road (up/down)
o
Not affected
o
At starting
o
While idling
o
At racing
o
While accelerating
o
While cruising
Driving conditions
o
While decelerating
o
While turning (RH/LH)
Vehicle speed
I
I
I
I
I
I
II
I
I
I
II
0 10 20 3040
5060
MPH
Malfunction indicatorlamp
o
Turned on
o
Not turned on
EC-267
PERIODICMAINTENANCE (ForEurope)
Engine andEmission ControlService
Abbreviations: I
=
Inspect andcorrect orreplace asnecessary,
R
MAINTENANCE OPERATION
MAINTENANCEINTERVAL
60 90
(36) (54)
Perform
eitheratnumber ofkilometers (miles)
or months, whichever comesfirst. km
x1,000
(Miles x1,000)
Months
Replace,
30
(18)
12 24
36120
(72) 48
Reference
page
•
Underhood andunder vehicle
GA
CD
Engine anti-freeze cootant(Ethylene glycolbase)(LLC)
SeeNOTE (1)
RMA-19
MA-38
Cooling system
I
I
I
I
MA-21 MA-40
Fuel lines
I
I
MA-22
MA-40
Air cleaner filter(Viscous papertype)*
RRMA-23 MA-41
Intake
&
exhaust valveclearance
SeeNOTE (2) EM-41
-
w
Drive
belts
SeeNOTE (3) I
I
I
MA-17,18
-
z
Ci
Fuel
filter* RMA-22
-
z
w
Spark plugs
SeeNOTE (4)
RR
RRMA-25
-
w
z
Ignition wires'
IMA-26
:::;
-
0
(fJ
PCVfilter* RRMA-26
-
<{
Cl
Vapor lines(Hoses, connections, etc.)
SeeNOTE (5) IIMA-26
-
(Heated) oxygensensor'
I
IMA-27
-
Fuel filter
RR
-
MA-41
--,w
wz
Nozzles SeeNOTE (6)
-
MA-43
(fJ-
wCl
-z
EM-120,
Ow
Timing beltsforcamshalt andinjection pump Replaceevery90,000 km(54,000 miles)
-
124
'. Except forSwedish models
NOTE: (1)Replace atthe first 90,000 km(54,000 miles)or60 months, thenevery 60,000 km(36,000 miles)or24 months, which-
ever comes first.
(2)
If
valve noise Increases, checkvalveclearance.
(3) After 60,000 km(36,000 miles)or24 months, inspectevery30,000 km(18,000 miles)or12 months, whichever comes
first.
(4) For Swedish models,performalmileage intervalonly.
(5) For Swedish models,inspectalthe first 90,000 km(54,000 miles),andthen every 60,000 km(36,000 miles)or24
months, whichever comesfirst.
(6)
If
engine powerdecreases, blacksmoke isemitted orengine noiseincreases, checkand,ifnecessary, adjustthe
fuel injection nozzle'sstartingpressure andthefuel spray pattern.
*
Maintenance itemswith
"*"
should beperformed morefrequently accordingto"Maintenance UnderSevere Driv-
ing Conditions".
MA-11
