3-43-4
BEFORE BEGINNING TROUBLESHOOTING
It is not appropriate to begin trouble shooting for the 4Y engine on the basis of results only. It can lead to mistaken
corrective action, wasted time, and sometimes to an increase in abnormalities. Therefore, please pay careful
attention to the details surrounding the time when a fault occurs, to be supplied by the customer based on the
following.
Diagnostic Procedure
First, it is necessary to get the "fault history and service history" for the vehicle, and then to gather definite
information about the fault occurrence such as "when", "at what times", "in what places", "during what operations or
actions", and "what happened afterwards".
Also, try to recreate the conditions for the fault occurrence. (a. The fault cannot be recreated, b. The fault can be
recreated: Upon doing what?)
General items
Condition of the defect (Tick the items that apply)
Customer name Date of shipment of vehicle Date of fault occurrence / hour meter
reading
Vehicle model Frame No. Engine No. (punched)
Fuel used
UGasoline ULPG UGasoline/LPG combination (Reference LPG fuel company name: )
Defect phenomena
1. Cannot start a. Does not crank b. Combustion does not start c. Incomplete combustion
2. Does not start well Poor cranking (when cold · when warm · at all times)
3. Poor idle a. Poor idle speed b. Unstable idle speed c. Hunting (Regular fluctuation in idle speed)
4. Engine stalling
a. Directly after startup (when cold · when warm) b. During reduction of speed
c. After reduction of speed d. Without warning e. After engine running rough
f. When steering g. During material handling h. Can be re-started immediately
5. Defective operational status
a. Insufficient power output b. Hesitation
c. Surging (swaying forward and backward during acceleration)
d. Knocking e. Back fire f. After fire
6. Others
a. Excessive fuel consumption b. Excessive oil consumption c. Overheat
d. Water / Oil leakage e. Abnormal noise f. Others ( )
Phenomena at the time of the defect's occurrence
The time when the fault began
to occur
a. Since the vehicle was new b. Recently (From which month and year)
c. After putting in for maintenance
Frequency of occurrence a. Always b. In certain conditions c. Occasionally
Weather
Sunny · Cloudy · Rain ·
Snow · Thunderstorm
Temperature Approximately GC Humidity Approximately %
Temperature conditions Coolant: a. When cool b. When warm Temperature inside engine room: GC
Operation conditions
a. No relation b. When idling c. When revving d. When accelerating
e. When travelling at constant speed f. When reducing speed
g. When travelling uphill
h. During material handling operations When not loaded (when steering · lifting · tilting)
When loaded (Load weight: approx. kg) (when steering · lifting · tilting)
i. Other (when using the inching brake · when steering · other)
Lamps a. Lights constantly b. Lights occasionally c. Does not light
03.book 4 ページ ２００７年２月２２日 木曜日 午後４時４７分
LPG Device for 4Y-E Engine
To Next Page
Need help?
General
