Mitsubishi FUEL Manual page 126

13A-126
Code No. P0173 Abnormal fuel system (Bank 2)
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 Data list
13 Intake air temperature sensor (Refer to P.13A-176.)
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13A-176.)
MUT-II Data list
25 Barometric pressure sensor (Refer to P.13A-176.)
Check the left bank side injector (Refer to P.13A-197*.)
Check the following connectors:
B-03, B-36, B-44, C-168
Check the harness wire between the engine-ECU and the injector
connector.
Check the fuel pressure (Refer to P.13A-189*.)
MUT-II Data list
83 Long-term fuel compensation (Refer to P.13A-176.)
D Is fuel trim more or less than zero?
Less than zero
No
MUT-II Data list
12 Volume air flow sensor
(Refer to P.13A-176.)
D Does the tester indi-
cate more than the
standard value?
Yes
Replace the volume air
flow sensor.
NOTE:
*: Refer to the '97 GALANT Workshop Manual (Pub. No. PWDE9611)
MPI <6A1> -
OK
OK
OK
OK
OK
OK
OK
D Check for fuel leaks
from injector.
D Check for entry of
foreign matter (water,
kerosene, etc.) into the
fuel.
OK
Replace the engine-ECU.
Troubleshooting
Probable cause
D Incorrect fuel pressure
D Malfunction of fuel supply system
D Malfunction of left bank 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
NG
Check the intake air temperature sensor system. (Refer to
P.13A-105, INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE P0110.)
NG
Check the engine coolant temperature sensor system. (Refer to
P.13A-106, INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE P0115.)
NG
Check the barometric pressure sensor system. (Refer to P.13A-103,
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
CODE P0105.)
NG
Replace
NG
Repair
NG
Repair
More than
zero
Check if air was drawn into
the intake system.
OK
MUT-II Data list
12 Volume air flow sensor
(Refer to P.13A-176.)
D Does the tester indi-
cate less than the
standard value?
Yes
Replace the volume air
flow sensor.
NG
Repair
No
D Check for clogging of
the injector.
D Check for clogging of
the fuel filter and fuel
line.
D Check the fuel pump
(insufficient discharge
rate.)
D Check for exhaust
leaks (oxygen sensor
installation section,
cracks in exhaust
manifold, cracks in
front pipe, etc.).
D Check for entry of
foreign matter (water,
kerosene, etc.) into the
fuel.
OK
Replace the engine-ECU.