Mitsubishi Eclipse 1990 Service Manual page 595

INSPECTION PROCEDURE 22
Too high CO and HC concentration when idling
[Comment]
Abnormal air-fuel ratio is suspected.
SCAN TOOL
Are diagnostic trouble codes output
NO
Check the ignition timing.
(Refer to GROUP On-vehicle Service.)
Check the ignition timing.
(Refer to GROUP 11 On-vehicle Service.)
OK
SCAN TOOL Data list
21 Engine coolant temperature sensor.
(Refer to
OK
SCAN TOOL Data list
13 Intake air temperature sensor (Refer to
OK
SCAN TOOL Data list
25 Barometric pressure sensor (Refer to
OK
SCAN TOOL Data list
59 Heated oxygen sensor (rear) (Refer to
Transaxle gear
ranae
Driving with the throttle wide open
OK:
OK
SCAN TOOL Data list
Heated oxygen sensor (front) (Refer to
OK: 1,000 when racing suddenly
OK
SCAN TOOL Data list
11 Heated oxygen sensor (front) (Refer to
O K : and
alternately when idling.
NG
Check the fuel pressure. (Refer to
Check the following items.
Check the injectors for operation sound.
Check the injectors for fuel leakage.
Check the ignition coil, spark plugs, spark plug cables.
Check the compression pressure.
Check the positive crankcase ventilation system.
Check the evaporative emission control system.
Check the system.
Check trouble symptom.
Replace the three-way
ENGINE (TURBO)
AND ENGINE>
YES
NG
Engine (Turbo)>
Engine>
NG
NG
NG
NG
converter.
TSB Revision
Troubleshooting
Malfunction of the
Refer to INSPECTION CHART FOR DIAGNOSTIC
TROUBLE CODES.
Check that the crankshaft position sensor and
installed
Check the engine coolant temperature
INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODES
Check the intake air temperature
INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE
Check the pressure circuit malfunction.
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
Check the oxygen sensor circuit malfunction (bank
to INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE
Check the oxygen sensor circuit malfunction (bank 1 sensor 1).
INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE
ratio
belt
malfunction. (Refer to
(Refer to
sensor 2). (Refer
I