T-406
S-4 [Engine output shortage]
Symptom
The engine output is below the target value, the output remains unchanged and the responsiveness
is poor even when the accelerator pedal is pressed.
Assumed cause
and action to be
taken
Cause Diagnostic method and action to be taken
1 Fuel or oil abnormality
• Check to ensure that fuel is filled.
• Check to ensure that specified fuel and oil are used.
• Check the fuel for any sign of freezing. If frozen, replace it with
a low temperature-withstanding fuel.
• Check the fuel for any water inclusion.
2 Fault in fuel piping and filter
• Check fuel line for any air inclusion.
• Check fuel filter for any clogging.
• Check to make sure the fuel pump is running.
3 Intake system fault
• Check air cleaner for any clogging.
• Check air intake piping for any fault.
4 Fault in exhaust system
• Check the exhaust system including muffler and exhaust pipe
for any abnormality.
5 Electrical wiring fault • Check engine and fuel circuit.
6 Hydraulic unit fault
• Check to ensure that hydraulic pump functions properly and
there is no abnormality that may cause engine overload.
[Additional information]
When engine stalls:
• Since the fuel injection unit may be faulty, execute an engine stall diagnosis.
Probability of output loss due to overheat:
• When engine coolant temperature is 95 ℃ or less, output decrease due to fuel flow rate limitation may be
the case.
Probability of output shortage because of a highland operation:
• In the case of a highland operation at an altitude of 2000 m or more, output decrease due to fuel flow rate
limitation may be the case.
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