Mitsubishi Pajero Pinin 1999 - Page 130

GDI ± Troubleshooting
13A-58
INSPECTION PROCEDURE 18
Too high CO and HC concentration when idling
Probable cause
The cause is probably an incorrect air/fuel ratio D Malfunction of air/fuel ratio control system
D Deterioration of the catalyst
MUT-II Self-Diag code
Is a diagnosis code displayed?
Yes
Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Check ignition timing. (Refer to GROUP 11A ± Engine Adjustment.)
NG
Check that the crank angle sensor and timing belt cover are proper-
ly installed.
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
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.)
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).
OK
Replace the oxygen sensor.
Check trouble symptom.
NG
NG
Measure fuel high-pressure between the fuel pump (high pressure)
and injector. (Refer to P.13A-97.)
NG
Repair
OK
Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.
Caution
Never touch the connector terminal as approx. 100 V is applied to the injector, or you are seriously injured.
(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.
NG
Replace the ignition coil.
OK
Check all the following items:
D Spark plug
D EGR system
D Compression pressure
D Clogged fuel filter or line
OK
To the next page
OK
MUT-II Data list
11 Oxygen sensor
OK: 600 ± 1,000 mV when the engine is suddenly raced