GDI ± Troubleshooting
13A-55
INSPECTION PROCEDURE 13
Hesitation, sag, stumble, poor acceleration or surge
Probable cause
The cause is probably a malfunction of the ignition system, electronic-controlled
throttle valve system, compression pressure, etc.
D Malfunction of the ignition system
D Malfunction of the air/fuel ratio control system
D Malfunction of the electronic-controlled throttle valve
system
D Improper compression pressure
D Air stuck in the air intake system
MUT-II Self-Diag code
Is a diagnosis code displayed?
Yes
Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.
NO
NG
Check the accelerator pedal position switch. (Refer to P.13A-65,
INSPECTION PROCEDURE 27.)
OK
MUT-II Data list
13 Intake air temperature sensor (Refer to P.13A-71.)
NG
Check the intake air temperature sensor. (Refer to P.13A-17, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 13.)
OK
MUT-II Data list
25 Barometric pressure sensor (Refer to P.13A-73.)
NG
Check the barometric pressure sensor. (Refer to P.13A-23, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 25.)
OK
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13A-72.)
NG
Check the engine coolant temperature sensor. (Refer to P.13A-19,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 21.)
OK
MUT-II Data list
79 Throttle position sensor (1st channel) (Refer to P.13A-75.)
NG
Check the throttle valve position feedback system. (Refer to
P.13A-38, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
99.)
OK
MUT-II Data list
11 Oxygen sensor
OK: 0 ± 400 mV and 600 ± 1,000 mV alternates when the
engine is idling (wait for four minutes after the engine
started).
NG
Measure fuel high-pressure between the fuel pump (high pressure)
and injector. (Refer to P.13A-97.)
OK
MUT-II Data list
11 Oxygen sensor
OK: 600 ± 1,000 mV when the engine is suddenly raced
NG
Check the oxygen sensor system. (Refer to P.13A-15, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE 11.)
OK
Check that air is sucked in the air intake system.
D Broken intake manifold gasket
D Damaged vacuum hose
D Damaged air intake hose
OK
MUT-II Data list
68 EGR valve (Refer to P.13A-74.)
NG
Check the EGR valve system. (Refer to P.13A-67, INSPECTION
PROCEDURE 29.)
OK
MUT-II Actuator test
08 Purge control solenoid valve (Refer to P.13A-76.)
NG
Check the purge control solenoid valve. (Refer to P.13A-68, IN-
SPECTION PROCEDURE 30.)
OK
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MUT-II Data list
26 Accelerator pedal position switch (Refer to P.13A-73.)
Check ignition timing. (Refer to GROUP 11A ± Engine Adjustment.)
Check that the crank angle sensor and timing belt cover are
properly installed.
NG
OK
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