MPI <4G6> -
Troubleshooting
13A-27
Code No. P0170 Abnormal fuel system Probable cause
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.
D
Incorrect fuel pressure
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>
Replace the engine-ECU
<M/T> or engine-A/T-ECU
<A/T>.
OK
Replace the volume air
flow sensor.
Yes
Replace the engine-ECU
<M/T> or engine-A/T-ECU
<A/T>.
OK
Yes
Replace the volume air
flow sensor.
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.
MUT-
II
Data list
12 Volume air flow sensor
(Refer to P.13A-75.)
D
Does the tester indi-
cate less than the
standard value?
OK
No
Less than zero
MUT-
II
Data list
12 Volume air flow sensor
(Refer to P.13A-75.)
D
Does the tester indi-
cate more than the
standard value?
NG
Repair
OK
MUT-
II
Data list
81 Long-term fuel compensation (Refer to P.13A-75.)
D
Is fuel trim more or less than zero?
More than
zero
Check if air was drawn into
the intake system.
OK
Check the fuel pressure (Refer to P.13A-85*.)
OK
Check the harness wire between the engine-ECU <M/T> or
engine-A/T
-ECU
<A/T>
and
the
injector
connector
.
NG
Repair
OK
Check the following connectors:
C-34
<M/T>,
C-177
<A/T>,
B-02,
B-03,
B-05,
B-36
NG
Repair
OK
Check the injector (Refer to P.13A-93*.)
NG
Replace
OK
MUT-
II
Data list
25 Barometric pressure sensor (Refer to P.13A-75.)
NG
Check the barometric pressure sensor system. (Refer to P.13A-12,
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
CODE P0105.)
OK
MUT-
II
Data list
13 Intake air temperature sensor (Refer to P.13A-75.)
NG
Check the intake air temperaturesensor system. (Refer to P.13A-14,
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
CODE P0110.)
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13A-75.)
NG
Check the engine coolant temperature sensor system. (Refer to
P.13A-16, INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE P0115.)
D
Check for fuel leaks
from injector.
D
Check for entry of
foreign matter (water,
kerosene,etc.) into the
fuel.
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
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