4. Troubleshooting
4-4
4.2.3
Engine revolutions will drop before rises up to rated pressure
Less than 100psi
(0.69MPa)[6.9bar]
Solenoid valve
opens
Faulty adjustment of
pressure
Re-adjust pressure
Check adjustment of
pressure regulator
Adjustment
Disassemble / clean or
replace
Check needle valve of
pressure regulator
Faulty needle valve or
needle valve seat spring
Faulty unloader
Replace pressure
regulator assembly
Change pressure gauge for
replacement one, and
re-adjust pressure gauge
Faulty pressure gauge
Normal
Adjustment
Replace it
Faulty adjustment
Repair or replace it
Check function of starting
unloader / purge solenoid
valve
[at AUTO IDLE operation]
Trouble of solenoid
valve for starting
unloader / purge
DC 0V
DC 12V
Repair or replace it
Faulty adjustment
Faulty
Less than 100psi
(0.69MPa)[6.9bar]
Solenoid valve closes
Check DCV between
CN1-9 and CN1-7 terminal
of emergency controller
(interior contact Ry2)
Trouble of emergency
controller or intake
negative pressure
sensor
A
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