Mitsubishi FUEL Manual page 225

Code No. P0170 Abnormal fuel system
Range of Check
D Engine: Being learning the air-fuel ratio
Set Conditions
D Ten seconds or more have been passed while the fuel injection amount
compensation value is too low.
or
D Ten seconds or more have been passed while the fuel injection amount
compensation value is too high.
MUT-II Self-Diag Code
Is any diagnosis code other than No.
P0170 output?
NO
Check the air intake from the intake
hose and intake manifold.
OK
Check the exhaust gas leaks from
the exhaust manifold.
OK
Check the throttle body (around the
throttle valve), and clean if
necessary. (Refer to P.13I-98*.)
OK
MUT-II Data list
74 Fuel pressure sensor
(Refer to 13I-98, DATA LIST
REFERENCE TABLE.)
OK
MUT-II Data list
11 Oxygen sensor (front)
12 Air flow sensor
13 Intake air temperature sensor
21 Engine coolant temperature
sensor
25 Barometric pressure sensor
(Refer to P.13I-98, DATA LIST
REFERENCE TABLE.)
Reference
If all the service data is normal, go
to "OK."
If any abnormal service is found, go
to "NG."
OK
Check the oxygen sensor (front)
(Refer to P.13I-126.)
OK
Check the purge control solenoid
valve (Refer to GROUP 17 -
Emission Control.)
OK
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NOTE:
*: Refer to the '99 GALANT Workshop Manual (Pub. No. PWDE9611-A)
GDI -
Troubleshooting
YES
Refer to P.13I-11, INSPECTION
CHART FOR DIAGNOSIS CODES.
NG
Repair
NG
Repair
NG
Cleaning
NG
Check fuel leakage around the fuel
pump (high-pressure) line.
Replace the fuel pump
(high-pressure).
NG
Refer to the Inspection procedure for
the sensor, which is indicated by the
abnormal service data.
(Refer to P.13I-11, INSPECTION
CHART FOR DIAGNOSIS CODES.)
NG
Replace
NG
Replace
Probable cause
D Malfunction of fuel supply system
D Malfunction of oxygen sensor (front)
D Malfunction of intake air temperature sensor
D Malfunction of barometric pressure sensor
D Malfunction of air flow sensor
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/T-ECU <A/T>
NG
OK
13I-31
Repair