Mitsubishi Pajero Pinin. Manual — part 48
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
GDI –
Troubleshooting
13A-59
From the previous page
OK
MUT-
II
Data list
68 EGR valve (Refer to P.13A-74.)
NG
Check the EGR valve system. (Refer to P.13A-67, INSPECTION
PROCEDURE 29.)
OK
MUT-
II
Actuator test
08 Purge control solenoid valve (Refer to P.13A-76.)
NG
Check purge control solenoid valve system. (Refer to P.13A-68,
INSPECTION PROCEDURE 30.)
OK
Check trouble symptom.
NG
Replace the injector.
Check trouble symptom.
NG
Replace the three-way catalytic converter.
INSPECTION PROCEDURE 19
Low alternator output voltage (approx. 12.3 V)
Probable cause
The cause is probably a malfunction of the alternator or one of the problems
listed at right.
D
Malfunction of the charging system
D
Open circuit between the alternator G terminal
and the engine-ECU
D
Malfunction of the engine-ECU
NG
Repair
OK
Check trouble symptom.
OK
Check the alternator. (Refer to GROUP
16 – Charging System.)
OK
Check the following connectors:
A-86, C-17
Measure at the alternator connector
A-79.
D
Connect the connector. (Use the
test harness MB991519)
D
Voltage between 1 (black clip)
and earth
(Engine: Idling)
(Radiator fan: Not operating)
(Headlamp: OFF
→
ON)
(Stop lamp: OFF
→
ON)
(Rear defogger switch: OFF
→
ON)
OK: Voltage increased by
0.2 – 3.5 V.
NG
Measure at the alternator connector
A-79.
D
Disconnect the connector, and
measure at the harness side.
D
Disconnect the engine-ECU
connector.
D
Continuity between 1 and earth
OK: No continuity
NG
Check the harness wire between
the alternator and the engine-ECU,
and repair if necessary.
Replace the engine-ECU.
NG
Check the harness wire between
the alternator and the engine-ECU.
OK
Repair
NG
GDI –
Troubleshooting
13A-60
INSPECTION PROCEDURE 20
Fans (radiator fan, A/C condenser fan) are inoperative.
Probable cause
The engine-ECU sends a duty signal to the fan controller according to engine coolant
temperature, vehicle speed, or A/C switch.
The fan controller controls radiator fan and condenser fan speeds, based on this
signal. (The closer the terminal voltage comes to 5 V, the higher the fan speed
becomes.)
D
Malfunction of the fan motor relay
D
Malfunction of the fan motor
D
Malfunction of the fan controller
D
Open or short circuit, or poor connector contact
D
Malfunction of the engine-ECU
NG
Repair
NG
Repair
NG
Repair
Measure at engine-ECU connector C-17.
D
Disconnect the connector, measure at the harness side.
D
Voltage between terminal 18 and earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V (The fan runs at high speed.)
D
Earth terminal 21.
(Ignition switch: ON)
OK: The fan stops.
NG
Check the following connector: A-29
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and fan control-
ler.
OK
Check the radiator fan and condenser fan circuit. (Refer to GROUP
14 – Troubleshooting.)
OK
Check the following connector: C-17
OK
Check trouble symptom.
NG
MUT-
II
Data list
21 Engine coolant temperature sensor
OK: After the engine has been warmed up, the engine coolant
temperature during idling is identical to the MUT-
II
reading.
NG
Check the engine coolant temperature sensor system. (Refer to
P.13A-19, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
21.)
OK
Check the thermostat.
NG
Replace
OK
Replace the engine-ECU.
GDI –
Troubleshooting
13A-61
INSPECTION PROCEDURE 21
GDI ECO indicator lamp does not illuminate.
Probable cause
If the GDI ECO indicator lamp does not illuminate after turning switch, the causes
listed in the right column are suspected.
D
Burned-out GDI ECO indicator lamp bulb
D
Open circuit or short-circuited harness wire in the
GDI ECO indicator lamp circuit
D
Malfunction of the engine-ECU
D
Malfunction of the GDI ECO indicator lamp ECU
NG
Repair
OK
NG
NG
Repair
Measure at engine-ECU connector C-17.
D
Disconnect the connector, and measure at the harness side.
D
Earth terminal 14. (Ignition switch: ON)
OK: The GDI ECO indicator lamp illuminates.
OK
Check the following connector: C-17
OK
Check trouble symptom.
NG
Replace the engine-ECU.
OK
Check the relative circuits of GDI ECO indication lamp.
(Refer to GROUP 54A-Troubleshooting.)
Check trouble symptom.
Check the following connectors: C-29, C-55
Check the harness wire between the GDI-ECO Indication lamp-
ECU and engine-ECU.
NG
NG
Repair
INSPECTION PROCEDURE 22
GDI ECO indicator lamp remains illuminated and does not
go off.
Probable cause
If the GDI ECO indicator lamp does not go off during high load operation, the causes
listed in the right column are suspected.
D
Short circuit between the GDI ECO indicator lamp
and engine-ECU
D
Malfunction of the engine-ECU
D
Malfunction of the GDI ECO indicator lamp ECU
Measure at GDI ECO indicator lamp ECU connector C-55.
D
Disconnect the connector, and measure at the harness side.
D
Disconnect the engine-ECU connector.
D
Continuity between terminal 3 and earth
OK: No continuity
NG
Check the harness wire between the GDI ECO indication lamp-
ECU and engine-ECU, and repair if necessary.
OK
Replace the engine-ECU.
Check the relative circuits of GDI ECO indication lamp.
(Refer to GROUP 54A-Troubleshooting.)
OK
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