Page 784 of 1701
TROUBLEDIAGNOSIS -General Description
Goto
(J.
Adjust ignition timingby
turning distributor.
No
NG
(Go to
@
onnext page.)
OK
CONNECT
CONSULTTOTHE VEHICLE.
Connect "CONSULT" tothe data link
connector forCONSULT andselect
"ENGINE" fromthemenu. Referto
EC-36
DOES ENGINE START?
BEFORE
STARTING
1. Check service records forany recent
repairs thatmay indicate arelated •
problem, orthe current needfor
scheduled maintenance.
2. 9pen engine hoodandcheck thefol.
lowing:
• Harness connectors forimproper con-
nections
• Vacuum hosesforsplits, kinks,or
improper connections
• Wiring forimproper connections,
pinches, orcuts
CHECK IGNITION TIMING.
1. Warm upengine sufficiently.
2. Stop engine anddisconnect throttle
position sensorharness connector.
3. Start engine.
4. Check ignition timingatidle using
timing light.
Ignition liming:
Refer toEC-36.
Basic
Inspection
Precaution:
Perform BasicInspection withoutelectrical or
mechanical loads
applied;
• Headlamp switchisOFF,
• Air conditioner switchisOFF,
• Rear defogger switchisOFF,
• Steering wheelisin the straight-ahead position,etc.
m
\\
~
~ SEF1421
~use box
~-~
vll-JI-
Datalinkconnector~'
EC-65
Page 990 of 1701
TROUBLEDIAGNOSIS -General Descrip_ti_on
1S_R_'
Basic Inspection
Precaution:
Perform BasicInspection withoutelectrical ormechanical loads
applied;
• Headlamp switchisOFF,
• Air conditioner switchisOFF,
• Rear defogger switchisOFF,
• Steering wheelisinthe straight-ahead position,etc.
m
BEFORE STARTING
1. Check service records forany recent •
repairs thatmay indicate arelated
problem, orthe current needfor
scheduled maintenance.
2. Open engine hoodandcheck thefol-
lowing:
• Harness connectors forimproper con-
nections
• Vacuum hosesforsplits, kinks,or
improper connections
• Wiring forimproper connections,
pinches, orcuts
Goto
(I.
No
CONNECT
CONSULTTOTHE VEHICLE.
Connect "CONSULT" tothe data link
connector forCONSULT andselect
"ENGINE" fromthemenu. Referto
EC-254.
DOES ENGINE START?
\\
~
~ SEF1421
START
•
IGN TIMING ADJ.
0
IGNITION TIMINGFEEDBACK
CONTROL WILLBEHELD BY
TOUCHING START
AFTER DOING SO,ADJUST
IGNITION TIMINGWITHA
TIMING LIGHTBYTURNING
THE CAMSHAFT POSITION
SENSOR.
SEF555N
Yes
CHECK IGNITION TIMING.
(ij\
1.Warm upengine sufficiently.
~ 2.Select "IGNTIMING ADJ"in
"WORK SUPPORT" mode.
3. Touch "START".
4. Check ignition timingatidle
using timing light.
Ignition timing:
15°::f:2° BTDC
~ 1Warm upengine sufficiently.
~ 2:
Stop engine anddisconnect
throttle position sensorhar-
ness connector.
3. Start engine.
4. Check ignition timingatidle
using timing light.
Ignition timing:
15°::f:2° BTDC
OK
(Go to
@
onnext page.) Adjust
ignition timingby
turning distributor.
EC-271
Page 1373 of 1701
HOWTOPERFORM EFFICIENT DIAGNOSIS FORANELECTRICAL INCIDENT
Incident Simulation Tests
INTRODUCTION
Sometimes thesymptom isnot present whenthevehicle isbrought infor service.
If
possible, re-create
the conditions presentatthe time ofthe incident. Doingsomay help avoid aNo Trouble FoundDiag-
nosis. Thefollowing sectionillustrates waystosimulate theconditionslenvironment underwhich the
owner experiences anelectrical incident.
The section isbroken intothesixfollowing topics:
• Vehicle vibration
• Heat sensitive
• Freezing
• Water intrusion
• Electrical load
• Cold orhot start up
Get athorough description ofthe incident fromthecustomer. Itis important forsimulating thecondi-
tions ofthe problem.
VEHICLE VIBRATION
The problem mayoccur orbecome worsewhiledriving onarough roadorwhen engine isvibrating
(idle with
AIC
on). Insuch acase, youwillwant tocheck foravibration relatedcondition. Refertothe
illustration below.
Connectors
&
harness
Determine whichconnectors andwiring harness wouldaffecttheelectrical systemyouareinspecting.
Gently
shakeeachconnector andharness whilemonitoring thesystem forthe incident youaretrying
to duplicate. Thistestmay indicate aloose orpoor electrical connection.
Hint
Connectors canbeexposed tomoisture. Itis possible toget athin film ofcorrosion onthe connector
terminals. Avisual inspection maynotreveal thiswithout disconnecting theconnector. Ifthe problem
occurs intermittently, perhapstheproblem iscaused bycorrosion. Itis agood ideatodisconnect, inspect
and clean theterminals onrelated connectors inthe system.
Sensors
&
relays
Gently
applyaslight vibration tosensors andrelays inthe system youareinspecting.
This testmay indicate aloose orpoorly mounted sensororrelay.
•
Vibration test
Bendgently.
GI-19
Tap
gently.
8GI839