MPI <4G9> -
Troubleshooting
13A-138
INSPECTION PROCEDURE 15
Hesitation, sag or stumble
Probable cause
In cases such as the above, the cause is probably that ignition system, air/fuel mixture
or compression pressure is defective.
D
Malfunction of the ignition system
D
Malfunction of air-fuel ratio control system
D
Malfunction of the fuel supply system
D
Malfunction of the EGR control solenoid valve system
D
Poor compression
NG
Check the throttle position sensor system. (Refer to P.13A-100,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0120.)
To the next page
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.)
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.
OK