MPI <4G9> -
Troubleshooting
13A-142
INSPECTION PROCEDURE 19
Surge
Probable cause
Defective ignition system, abnormal air-fuel ratio, etc. are suspected.
D
Malfunction of the ignition system
D
Malfunction of air-fuel ratio control system
D
Malfunction of the EGR control solenoid valve system
OK
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Check the EGR control system.
OK
Check the fuel pressure. (Refer to P.13A-78*.)
OK
1. Inspect the intake of
air into the air intake
system
D
Broken intake
manifold gasket
D
Broken vacuum
hose
D
PCV valve does
not operate.
D
Broken air intake
hose
2. Check the injector for
clog.
NG
Check the fuel pressure.
(Refer to P.13A-78*.)
OK
MUT-
II
Data list
11 Oxygen sensor
OK:
Changes between 0 - 400 mV and 600 - 1,000 mV during
idling
NG
Check the oxygen sensor (front) system. (Refer to P.13A-103, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)
OK
MUT-
II
Data list
11 Oxygen sensor
OK:
Changes between 600 - 1,000 mV during sudden racing
NG
Check the oxygen sensor (rear) system. (Refer to P.13A-106, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)
OK
MUT-
II
Data list
59 Oxygen sensor (rear)
D
Transmission: 2nd gear <M/T>, L range <A/T>
D
Driving with throttle widely open
OK:
600 - 1,000 mV
NG
Check the EGR control solenoid valve system.
(Refer to P.13A-117, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0403.)
OK
MUT-
II
Actuator test
10 EGR control solenoid valve (Refer to P.13A-158.)
NG
Check the throttle position sensor system. (Refer to P.13A-100,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0120.)
OK
MUT-
II
Data list
14 Throttle position sensor (Refer to P.13A-154.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13A-98, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE P0115.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13A-154.)
NG
Check the barometric pressure sensor system. (Refer to P.13A-94.
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0105.)
OK
MUT-
II
Data list
25 Barometric pressure sensor (Refer to P.13A-155.)
NG
Check the intake air temperature sensor system. (Refer to P.13A-96,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0110.)
OK
MUT-
II
Data list
13 Intake air temperature sensor (Refer to P.13A-153.)
NG
Check that the crank angle sensor is installed properly.
OK
Check the ignition timing.
(Refer to GROUP 11A - On-vehicle Service.)
NG
Check theinjector system. (Refer to P.13A-110, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203, P0204.)
No
Check the injectors for operation sound.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13A-90, INSPECTION CHART FOR DIAGNOSIS
CODES.
NOTE:
*: Refer to the ’96 COLT/LANCER Workshop Manual (Pub. No. PWME9511).