GDI ± Troubleshooting
13A-51
INSPECTION PROCEDURE 10
When the engine is hot, it stalls at idling. (Die out)
Probable cause
The cause is probably an improper air/fuel ratio, faulty electronic-controlled throttle
valve system, compression pressure. In addition, if the engine stalls suddenly, another
possible cause might be a poor connector contact.
D Malfunction of the ignition system
D Malfunction of air/fuel ratio control system
D Malfunction of electronic-controlled throttle valve
system
D Malfunction of the throttle body
D Poor connector contact
D Improper compression pressure
D Air stuck in the air intake system
NG
Repair
Have the battery terminals been disconnected recently?
Yes
Warm up the engine, and then let it run at idle for approx. ten
minutes.
No
MUT-II Self-Diag code
Is a diagnosis code displayed?
Yes
Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
MUT-II Data list
79 Throttle position sensor (1st channel) (Refer to P.13A-75.)
NG
Check the throttle position sensor (1st channel) system. (Refer
to P.13A-35, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 79.)
OK
Is it easy to reproduce the engine stall?
No
While carrying out an intermittent malfunction simulation test. (Re-
fer to GROUP 00 ± Points to Note for Intermittent Malfunction.),
check for sudden changes in the following signals.
D Crank angle sensor signal
D Injector drive signal
D Fuel pump (low pressure) drive signal
D Air flow sensor
D Primary ignition signal
D Power supply to the engine-ECU
Yes
MUT-II Data list
26 Accelerator pedal position switch (Refer to P.13A-73.)
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.)
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
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
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
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