Mitsubishi Pajero Pinin. Manual — part 119
MPI <4G9> –
Troubleshooting
13C-62
OK
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Check the compression pressure.
D
Check the fuel filter or fuel line for clogging.
D
Broken air intake hose
D
Clogged air cleaner
OK
Check the fuel pressure. (Refer to P.13C-98.)
OK
1. Inspect the intake of
air into the air intake
system
D
Broken intake
manifold gasket
D
Broken vacuum
hose
D
PCV valve does
not operate.
D
Broken air intake
hose
2. Check the injector for
clog.
NG
Check the fuel pressure.
(Refer to P.13C-98.)
OK
MUT-
II
Data list
11 Oxygen sensor
OK: Changes between 0 – 400 mV and 600 – 1,000 mV
during idling
From the previous page
MPI <4G9> –
Troubleshooting
13C-63
INSPECTION PROCEDURE 19
Surge
Probable cause
Defective ignition system, abnormal air-fuel ratio, etc. are suspected.
D
Malfunction of the ignition system
D
Malfunction of air-fuel ratio control system
D
Malfunction of the EGR control solenoid valve system
OK
Check the following items.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Check the EGR control system.
OK
Check the fuel pressure. (Refer to P.13C-98.)
OK
1. Inspect the intake of
air into the air intake
system
D
Broken intake
manifold gasket
D
Broken vacuum
hose
D
PCV valve does
not operate.
D
Broken air intake
hose
2. Check the injector for
clog.
NG
Check the fuel pressure.
(Refer to P.13C-98.)
OK
MUT-
II
Data list
11 Oxygen sensor
OK: Changes between 0 – 400 mV and 600 – 1,000 mV
during idling
NG
Check the oxygen sensor (front) system. (Refer to P.13C-25, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)
OK
MUT-
II
Data list
11 Oxygen sensor
OK: Changes between 600 – 1,000 mV during sudden racing
NG
Check the oxygen sensor (rear) system. (Refer to P.13C-27, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)
OK
MUT-
II
Data list
59 Oxygen sensor (rear)
D
Transmission: 2nd gear <M/T>, L range <A/T>
D
Driving with throttle widely open
OK: 600 – 1,000 mV
NG
Check the EGR control solenoid valve system.
(Refer to P.13C-36, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0403.)
OK
MUT-
II
Actuator test
10 EGR control solenoid valve (Refer to P.13C-79.)
NG
Check the throttle position sensor system. (Refer to P.13C-22,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0120.)
OK
MUT-
II
Data list
14 Throttle position sensor (Refer to P.13C-75.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13C-20, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13C-75.)
NG
Check the barometric pressure sensor system. (Refer to P.13C-16.
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0105.)
OK
MUT-
II
Data list
25 Barometric pressure sensor (Refer to P.13C-76.)
NG
Check the intake air temperature sensor system. (Refer to
P.13C-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0110.)
OK
MUT-
II
Data list
13 Intake air temperature sensor (Refer to P.13C-74.)
NG
Check that the crank angle sensor is installed properly.
OK
Check the ignition timing.
(Refer to GROUP 11C – On-vehicle Service.)
NG
Check the injector system. (Refer to P.13C-32, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203, P0204.)
No
Check the injectors for operation sound.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13C-12, INSPECTION CHART FOR DIAGNOSIS
CODES.
MPI <4G9> –
Troubleshooting
13C-64
INSPECTION PROCEDURE 20
Knocking
Probable cause
In cases as the above, the cause is probably that the detonation control is defective
or the heat value of the spark plug is inappropriate.
D
Defective detonation sensor
D
Inappropriate heat value of the spark plug
Yes
Check the following items.
D
Spark plugs
D
Check if foreign materials (water, alcohol, etc.) got into fuel.
No
Check the detonation sensor system. (Refer to P.13C-33, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE P0325.)
No
Does knocking occur when driving with the sensor disconnected?
At this time, use the MUT-
II
to check if the timing is retarded
compared to when the detonation sensor connector is connected.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13C-12, INSPECTION CHART FOR DIAGNOSIS
CODES.
INSPECTION PROCEDURE 21
Dieseling
Probable cause
Fuel leakage from injectors is suspected.
D
Fuel leakage from injectors
Check the injectors for fuel leakage.
MPI <4G9> –
Troubleshooting
13C-65
INSPECTION PROCEDURE 22
Too high CO and HC concentration when idling
Probable cause
Abnormal air-fuel ratio is suspected.
D
Malfunction of the air-fuel ratio control system
D
Deteriorated catalyst
NG
Replace the catalytic converter.
Check the trouble symptom.
OK
NG
Check the following items.
D
Check the injectors for operation sound.
D
Check the injectors for fuel leakage.
D
Check the ignition coil, spark plugs, spark plug cables.
D
Check the compression pressure.
D
Check the positive crankcase ventilation system.
D
Check the purge control system.
D
Check the EGR control system.
NG
Check the fuel pressure. (Refer to P.13C-98.)
Check the trouble symptom.
OK
Replace the oxygen sensor.
OK
MUT-
II
Data list
11 Oxygen sensor
OK: Repeat 0 – 400 mV and 600 – 1,000 mV alternately
when idling.
NG
Check the oxygen sensor (front) system. (Refer to P.13C-25, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)
OK
MUT-
II
Data list
11 Oxygen sensor
OK: 600 – 1,000 mV when racing suddenly.
NG
Check the oxygen sensor (rear) system. (Refer to P.13C-27, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)
OK
MUT-
II
Data list
59 Oxygen sensor (rear)
D
Transmission: 2nd gear <M/T>, L range <A/T>
D
Driving with throttle widely open
OK: 600 – 1,000 mV
NG
Check the barometric pressure sensor system. (Refer to P.13C-16,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0105.)
OK
MUT-
II
Data list
25 Barometric pressure sensor (Refer to P.13C-76.)
NG
Check the intake air temperature sensor system. (Refer to
P.13C-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0110.)
OK
MUT-
II
Data list
13 Intake air temperature sensor (Refer to P.13C-74.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13C-20, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor. (Refer to P.13C-75.)
NG
Check that the crank angle sensor is installed properly.
No
Check the ignition timing.
(Refer to GROUP 11B – On-vehicle Service.)
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13C-12, INSPECTION CHART FOR DIAGNOSIS
CODES.
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