Isuzu 4HL1 Workshop Manual page 48

1A-46 Engine Control System
Engine Control System Diagnostic Chart
Customer
Driver
Vehicle acceptance
date
Registration No.
No engine start
Poor startability
Instable idling
Poor driveability
Engine stall
Vibration at idling
Data observed at fault occurrence
Fault generation frequency
Weather
Temperature
Place
Engine temperature
Driving conditions
Check Engine lamp
DTC
Fault history
No cranking
Long cranking (6 seconds or more)
Others
Incorrect idle speed (idle speed enters into
typical range after warm-up)
Rough idling (idle speed deviates from
the typical range after warm-up)
Surging
Unusual sound
Immediately after engine startup
At operation of A/C
At gear shifting
Engine has transverse vibration and body has vertical vibration (engine's vertical vibration is weaker than body's
vibration)
Always Occasionally (cycles:
Others
Clear Cloudy
30 C or above
Highway
Rough road
Cold Warm-up
Startup
Driving
A/C SW ON/OFF
ON
Past
Present
Date (year/month/day)
Date (year/month/day)
Inspector:
Vehicle model and model
year
Vehicle ID
Engine model
Engine ID
Engine type
Odometer reading
No initial combustion
Unusual idle speed
Others
Knocking Extensive black/white smoke
Others
At release of accelerator pedal
Immediately after engine oil replacement
Others
Rainy Snowy
20-30 C 10-15 C
Suburban area Urban area
Others
After warm-up Coolant temperature
Immediately after startup (
Steady-speed driving Acceleration
Others
Occasionally ON
Incomplete initial combustion
High ( rpm)
Engine vibration
times/month) Once
Combined/
others
0 C or below ( C)
Uphill slope Downhill slope
C Oil temperature
minutes) Idling Racing
Deceleration
OFF
km
Low ( rpm)
C
LNW21AXF000701-X