19-4 19-4 Electrical System Troubleshooting TROUBLESHOOTING BEFORE BEGINNING TROUBLESHOOTING FOR THE 4Y-E ENGINE It is extremely risky to begin troubleshooting 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, ask the customer about detailed information on conditions around the time a problem occurred, based on the following.
Diagnostic Procedure First, it is necessary to be informed of the "fault history and service history" for the vehicle, and then to gather definite information about the fault occurence such as "when", "at what times", "in what places", "during what operations or actions", "what happened afterwards", and “frequency of occurrence”. Also, try to recreate the conditions for the fault occurence. (a. Recreation impossible b. Recreation possible: in what condition?) General items Condition of the defect (Tick the items that apply) Section 19 Customer name Date of delivery Date fault occurred / hour meter reading Vehicle model Frame No. Engine No.
(punched) Fuel type F Gasoline F LPG F Gasoline - LPG combination (Note 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 speed) 4. Engine stalling a. Immediately after start-up (when cold - when warm) b. During deceleration c. After deceleration d. Without sign e. After the engine has been running rough f. When steering g. When handling materials h. Can be re-started immediately 5. Defect operational status a. Insufficient power output b.
Hesitation c. Surging (swaying forward and backward during acceleration) d. Knocking e. Backfiring f. After firing 6. Other a. Excessive fuel consumption b. Excessive oil consumption c. Overheating d. Water or oil leaks e. Abnormal noise f. Other ( ) Environment 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 around the following date (month and year): ) c. After being serviced Frequency of occurence a. Always b. Under certain conditions c. Sometimes Weather Sunny - cloudy - rain - snow - thunderstorm Temperature Approximately °C Humidity Approximately % Temperature conditions Coolant: a. When cool b.
When warm Temperature inside engine room: °C Operation conditions a. No relation b. When idling c. When revving d. When accelerating e. When traveling at constant speed f. When decelerating g. When climbing a slope h. During material handling operations When not loaded (when steering - when lifting - when tilting) When loaded (load: appox. kg) (when steering - when lifting - when tilting) i. Other (when using the inching brake - when steering - other) Lamps a. Lights constantly b. Lights occaisonally c. Does not light