
MPI –
Troubleshooting
13-30
INSPECTION PROCEDURE 13
The engine stalls when starting the car. (Pass out)
Probable cause
In cases such as the above, the cause is probably misfiring due to a weak spark,
or an inappropriate air/fuel mixture when the accelerator pedal is depressed.
D
Drawing air into intake system
D
Malfunction of the ignition system
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.
No
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Check if air was drawn into the intake system.
Broken intake manifold gasket
Broken or disconnected vacuum hose
Improper operation of the PCV valve
Broken air intake hose
INSPECTION PROCEDURE 14
The engine stalls when decelerating.
Probable cause
In cases such as the above, the cause is probably that the intake air volume is insufficient
due to a defective idle speed control (ISC) servo system.
D
Malfunction of the ISC servo system
No
MUT-
II
Data list
26 Idle position switch (Refer to P.13-XX.)
NG
Check the idle position switch system.
(Refer to P.13-XX, INSPECTION PROCEDURE 26.)
OK
MUT-
II
Data list
14 Throttle position sensor (Refer to P.13-57.)
NG
Check the throttle position sensor system. (Refer to P.13-9, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)
OK
MUT-
II
Data list
45 ISC servo position
D
Is the idle speed control (ISC) servo position drops to 0 – 2
steps when decelerating (engine r/min less than 1,000)?
Yes
Check the vehicle speed sensor system. (Refer to P.13-13, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE 24.)
No
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Clean the throttle valve area.
D
Check and adjust the fixed SAS.
No
MUT-
II
Data list
26 Idle position switch (Refer to P.13-58.)
NG
Check the idle position switch system.
(Refer to P.13-38, INSPECTION PROCEDURE 26.)
No
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.
Were the battery terminals disconnected recently?
Yes
After warming-up, let the engine run at idling for about 10 minutes.