Mitsubishi Pajero Pinin. Manual - part 50

 

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Mitsubishi Pajero Pinin. Manual - part 50

 

 

GDI – 

Troubleshooting

13A-66

INSPECTION PROCEDURE 28

Fuel pump (low pressure) system

Probable cause

The engine-ECU turns on the fuel pump relay while the engine is cranking or running,
and supplies power source to the fuel pump (low pressure).

D

Malfunction of the fuel pump relay

D

Malfunction of the fuel pump (low pressure)

D

Open circuit or short-circuited harness wire in the
fuel pump (low pressure) circuit, or poor connector
contact

D

Malfunction of the engine-ECU

Check trouble symptom.

NG

Check the harness wire between the
fuel pump (low pressure) and earth,
and repair if necessary.

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between the
fuel pump relay and engine-ECU, and
repair if necessary.

NG

Repair

OK

NG

Repair

OK

Check the ignition switch. (Refer to
GROUP 54 – Ignition Switch.)

(2) NG

Check the following connector:
D-12

MUT-

II

 Actuator test

07 Fuel pump (Refer to P.13A-76.)

OK

Normal

NG

Check the fuel pump relay. (Refer to
P.13A-102.)

NG

Replace

OK

Measure at fuel pump relay connector
A-41X.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between terminals 3, 4 and
earth
(Ignition switch: ON)
OK: System voltage

NG

Check the following connectors:
C-72, C-74

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between the
fuel pump relay and ignition switch.

OK

Measure at engine-ECU connector
C-17.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between terminal 21 and
earth (Ignition switch: ON)
OK: System voltage

NG

Check the following connector:
A-41X

OK

Measure at engine-ECU connector
C-17.

D

Disconnect the connector, and
measure at the harness side.

D

Short circuit between terminal 21
and earth (Ignition switch: ON)
OK: The fuel pump operates (its

operation sound can be
heard).

OK

Check the following connector:
C-17

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Measure at fuel pump (low pressure)
connector D-17.

D

Disconnect the connector, and
measure at the harness side.

(1) Voltage between terminal 5 and

earth
(Ignition switch: ON)
OK: System voltage

(2) Continuity between 4 and earth

OK: Continuity

(1) NG

Check the following connectors:
C-24<LHD>, C-26<RHD>, D-12

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between the
fuel pump relay and fuel pump (low
pressure), and repair if necessary.

OK

Check the following connector:
D-17

NG

Repair

OK

Check trouble symptom.

NG

Replace the fuel pump (low pressure).

GDI – 

Troubleshooting

13A-67

INSPECTION PROCEDURE 29

EGR valve system

Probable cause

The engine-ECU controls the EGR valve in order to control the amount of
exhaust gas mixed in the intake air.

D

Malfunction of the EGR valve

D

Open circuit or short-circuited harness wire in the
EGR valve circuit

D

Malfunction of the engine-ECU

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine-ECU and EGR valve, and repair
if necessary.

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the following connector:
C-17

NG

Repair

OK

Measure at the engine-ECU connector
C-17.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 5, 6, 32, 34
and earth (Ignition switch: ON)
OK: System voltage

NG

Check the following connectors:
A-60, A-82

NG

Repair

OK

Measure at the EGR valve connector
A-60.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 2, 5 and earth
(Ignition switch: ON)
OK: System voltage

NG

Check the EGR valve. (Refer to
GROUP 17 – Emission Control Sys-
tem.)

NG

Replace

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine control relay and the EGR valve,
and repair if necessary.

Check the following connectors:
A-36, A-82

NG

Repair

GDI – 

Troubleshooting

13A-68

INSPECTION PROCEDURE 30

Purge control solenoid valve system

Probable cause

The engine-ECU controls the purge control solenoid valve in order to control
the purge air coming from the canister.

D

Malfunction of the purge control solenoid valve

D

Open circuit or short-circuited harness wire in the
purge control solenoid valve circuit

D

Malfunction of the engine-ECU

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine-ECU and the purge control sole-
noid valve, and repair if necessary.

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the following connector:
C-17

NG

Repair

OK

Measure at the engine-ECU connector
C-17.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 16 and earth
(Ignition switch: ON)
OK: System voltage

NG

Check the following connector:
A-02

NG

Repair

OK

Measure at the purge control solenoid
valve connector A-02.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 2 and earth
(Ignition switch: ON)
OK: System voltage

NG

Check the purge control solenoid valve.
(Refer to GROUP 17 – On-vehicle Ser-
vice.)

NG

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine control relay and the purge
control solenoid valve, and repair if
necessary.

Check the following connector:
A-36

NG

Repair

Replace

GDI – 

Troubleshooting

13A-69

INSPECTION PROCEDURE 31

Power steering fluid pressure switch system

Probable cause

The power steering fluid pressure switch sends a signal to the engine-ECU according
to power steering load.
Based on this signal, the engine-ECU controls the throttle control servo so that
idle speed increases when the power steering is in operation.

D

Malfunction of the power steering fluid pressure switch

D

Open circuit or short-circuited harness wire in the
power steering fluid pressure switch circuit, or poor
connector contact

D

Malfunction of the engine-ECU

NG

NG

Repair

OK

Replace the engine-ECU.

NG

Repair

Check the power steering fluid pressure switch. (Refer to GROUP
37A – On-vehicle Service.)

NG

Replace

OK

Measure at power steering fluid pressure switch connector A-76.

D

Disconnect the connector, and measure at the harness side.

D

Voltage between terminal 1 and earth
(Ignition switch: ON)
OK: System voltage

NG

Check the following connector: C-18

OK

Check trouble symptom.

Check the harness wire between the engine-ECU and power steer-
ing fluid pressure switch.

NG

Repair

OK

OK

Check the following connector: A-76

Check trouble symptom.

NG

INSPECTION PROCEDURE 32

A/C switch and A/C relay system

Probable cause

If the engine-ECU receives a ‘A/C on’ signal, it operates the throttle control servo
and A/C compressor magnetic clutch so that idle speed increases.

D

Malfunction of the A/C control system

D

Malfunction of the A/C switch

D

Open circuit or short-circuited harness wire in the
A/C switch circuit, or poor connector contact

D

Malfunction of the engine-ECU

NG

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU.

Service the A/C compressor relay. (Refer to GROUP 55 – On-ve-
hicle Service.)

NG

Replace

OK

Measure at engine-ECU connectors C-17, C-19.

D

Disconnect the connector, and measure at the harness side.

D

Voltage between terminals 20, 83 and earth
(Ignition switch: ON)
OK: 0 – 3 V

(A/C switch: OFF)
System voltage
(A/C switch: ON)

D

Connect terminal 20 to earth.
(Ignition switch: ON, A/C switch: ON)
OK: A/C compressor clutch turns on.

OK

Check the following connectors: C-17, C-19

Check the A/C system. (Refer to GROUP 55 – On-vehicle Service.)

 

 

 

 

 

 

 

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