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