GENERAL INTRODUCTION (ENGINE)
GN01–15
SYMPTOM SIMULATION
EN00106013200003
HINT
The most difficult case in troubleshooting is when no problem symp-
toms occur. In such a case, a thorough problem analysis must be car-
ried out. A simulation of the same or similar conditions and
environment in which the problem occurred in the customer's vehicle
should be carried out. No matter how much skill or experience a tech-
nician has, troubleshooting without confirming the problem symp-
toms will lead to important repairs being overlooked and mistakes or
delays.
For example:
With a problem that only occurs when the engine is cold or as a result
of vibration caused by the road during driving, the problem can never
be determined if the symptoms are being checked on a stationary
vehicle or a vehicle with a warmed-up engine. Vibration, heat or water
penetration (moisture) is difficult to reproduce. The symptom simula-
tion tests below are effective substitutes for the conditions and can
be applied on a stationary vehicle. Important points in the symptom
simulation test: In the symptom simulation test, the problem symp-
toms as well as the problem area or parts must be confirmed. First,
narrow down the possible problem circuits according to the symp-
toms. Then, connect the tester and carry out the symptom simulation
test, judging whether the circuit being tested is defective or normal.
Also, confirm the problem symptoms at the same time. Refer to the
problem symptoms table for each system to narrow down the possi-
ble causes.
1.
VIBRATION METHOD: When malfunction seems to occur as a
result of vibration.
(1)
PART AND SENSOR
Apply slight vibration with a finger to the part of the sensor suspected
to be the cause of the problem, and check whether or not the malfunc-
tion occurs.
NOTICE
Applying strong vibration to relays may open relays
(2)
CONNECTORS
Slightly shake the connector vertically and horizontally.
(3)
WIRE HARNESS
Slightly shake the wire harness vertically and horizontally.
HINT
The connector joint and fulcrum of the vibration are the major areas
that should be checked thoroughly.
2.
HEAT METHOD: When a malfunction seems to occur when the
area in question is heated.
(1)
Heat the component that is the possible cause of the malfunction with
a hair dryer or similar device. Check if the malfunction occurs.
NOTICE
•
Do not heat to more than 60
C (140
F). Exceeding this tempera-
ture may damage components.
•
Do not apply heat directly to the parts in the ECU.
Vibrate slightly
Vibrate
slightly
Shake slightly
SHTS001060100027
Содержание J08E-VC
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