Engine Electrical System

Diagnostic trouble code: P0506 “Idle speed lower than nominal idle speed”
Item
No.
Operation procedure
Inspection
results
Follow-up
procedure
1
Connect the diagnostic tester and adaptor,
and turn the ignition switch to “OFF”
position.
Proceed to next
step.
Yes
Proceed to next
step.
2
Verify that the adjusting screw of throttle,
accelerator pedal stay and working
condition of throttle are in good condition.
No
Carry out
necessary
Overhaul.
Yes
Proceed to next
step.
3
Verify that the working condition of idle
speed regulator is correct.
No
Carry out
necessary
Overhaul.
Yes
Carry out
necessary
Overhaul.
4
A. Verify that there is under pressure in the
fuel supplying system;
B. Verify that there is blockage in the fuel
injector;
C. Verify that there is blockage in the
exhaust system.
No
Refer to diagnosis
help.
E-49
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