Mitsubishi Pajero Pinin. Manual - part 85

 

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Mitsubishi Pajero Pinin. Manual - part 85

 

 

GDI  – 

Troubleshooting

13A-89

INSPECTION PROCEDURE 26

Ignition switch-ST system <M/T>

Probable cause

The ignition switch-ST outputs a HIGH signal to the engine-ECU while the
engine is cranking.
The engine-ECU uses this signal to carry out functions such as fuel injection
control during starting.



Malfunction of the ignition switch



Open circuit or short-circuited harness wire of the
ignition switch circuit



Malfunction of the engine-ECU

NG

Repair

OK

Check the ignition switch. (Refer to
GROUP 54.)

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Check the following connector:
C-18

NG

Repair

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine-ECU and the ignition switch.

(1) NG

Check the following connector:
C-27

NG

Repair

Check the harness wire between the
engine-ECU connector (terminal
No.91) and the earth, repair it neces-
sary.

(2) NG

Measure at the engine-ECU connector
C-18.



Disconnect the connector, and
measure at the harness side.

(1) Voltage between 68 and earth

(Ignition switch: START)
OK: 8 V or more

(2) Continuity between 67 and earth

OK: Continuity

INSPECTION PROCEDURE 27

Ignition switch-ST and inhibitor switch system <A/T>

Probable cause

The ignition switch-ST outputs a HIGH signal to the engine-ECU while the
engine is cranking, and the engine-ECU uses this signal to carry out functions
such as fuel injection control during starting.
The inhibitor switch inputs the position of the selector lever to the engine-ECU.
The engine-ECU uses this signal to carry out idle speed control.



Malfunction of the ignition switch



Malfunction of the inhibitor switch



Open circuit or short-circuited harness wire
between ignition switch and inhibitor switch



Malfunction of the engine-ECU

GDI  – 

Troubleshooting

13A-90

NG

Repair

OK

Replace the engine-ECU

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

NG

Repair

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine-ECU and the inhibitor switch
connector.

(1) NG

Check the following connectors:
C-18, C-24 <LHD>, C-26 <RHD>,
D-02

NG

Repair

Check the harness wire between the
inhibitor switch connector and the start-
er S terminal, and repair if necessary.

(2) NG

Measure at the inhibitor switch connec-
tor B-04.



Disconnect the connector, and
measure at the harness side.

(1) Voltage between 4 and earth

(Ignition switch: ON)
OK: System voltage

(2) Continuity between 1 and earth

OK: Continuity

(3) Voltage between 4 and earth

(Ignition switch: START)
Disconnect the engine-ECU con-
nector.
OK: System voltage

OK

Check the inhibitor switch (Refer to
GROUP 23 – On-vehicle Service).

NG

Repair

OK

Check the following connectors:
A-83, B-01

NG

Check the trouble symptoms.

NG

Check the following connector:
B-04

Repair

NG

Repair

OK

Check the harness wire between the
engine-ECU and the inhibitor switch.

OK

Check the following connectors:
C-39, D-02

NG

Check the trouble symptoms.

Check the ignition switch (Refer to
GROUP 54.)

OK

Check the harness wire between the
inhibitor switch and the ignition switch
connector.

(3) NG

NG

Replace

NG

Repair

INSPECTION PROCEDURE 28

Accelerator pedal position switch system

Probable cause

The accelerator pedal position switch detects that the accelerator pedal is fully closed,
and sends a signal to the engine-ECU. The engine-ECU controls idle speed, based
on this signal.



Maladjustment of the accelerator cable



Maladjustment of the accelerator pedal position switch



Open circuit or short-circuited harness wire in the
accelerator pedal position switch system, or poor
connector contact



Malfunction of the engine-ECU

NG

Repair

NG

Replace the engine-ECU.

OK

NG

Repair

Check the accelerator pedal position switch. (Refer to P.13A-105*.)

NG

Replace the accelerator pedal position sensor assembly.

OK

Measure at accelerator pedal position sensor connector C-46.



Disconnect the connector, and measure at the harness side.



Voltage between terminal 4 and earth
(Ignition switch: ON)
OK: 4 V or more



Continuity between terminal 5 and earth
OK: Continuity

NG

Check the following connectors: A-36, C-19 

OK

Check trouble symptom.

NG

Check the harness wire between the engine-ECU and accelerator
pedal position sensor.

OK

Check the following connector: C-46

NG

Repair

OK

Check trouble symptom.

NOTE
*:

Refer to the ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE99E1)

GDI  – 

Troubleshooting

13A-91

INSPECTION PROCEDURE 29

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).



Malfunction of the fuel pump relay



Malfunction of the fuel pump (low pressure)



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



Malfunction of the engine-ECU

NG

Replace the fuel pump (low pressure).

OK

Check trouble symptom.

OK

Check the following connector:
D-17

NG

Repair

Check trouble symptom.

NG

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

NG

Repair

OK

(2) NG

Check the following connector:
D-12

OK

Check trouble symptom.

NG

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

(1) NG

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

NG

Repair

NG

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



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

OK

Check trouble symptom.

NG

Replace the engine-ECU.

OK

Check the following connector:
C-17

NG

Repair

OK

Measure at engine-ECU connector
C-17.



Disconnect the connector, and
measure at the harness side.



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

operation sound can be
heard).

Check trouble symptom.

NG

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

NG

Repair

OK

OK

Measure at engine-ECU connector
C-17.



Disconnect the connector, and
measure at the harness side.



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

NG

Check the following connector:
A-41X

NG

Repair

OK

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

OK

Check trouble symptom.

NG

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

NG

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

NG

Repair

OK

Measure at fuel pump relay connector
A-41X.



Disconnect the connector, and
measure at the harness side.



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

NG

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

NG

Replace

MUT-

II

 Actuator test

07 Fuel pump (Refer to P.13A-100.)

OK

Normal

NOTE
*:

Refer to the ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1)

GDI  – 

Troubleshooting

13A-92

INSPECTION PROCEDURE 30

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.



Malfunction of the power steering fluid pressure switch



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



Malfunction of the engine-ECU

NG

Repair

OK

Replace the engine-ECU

NG

NG

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

NG

Repair

OK

Check trouble symptom.

NG

Replace

OK

NG

Check the following connector: C-18

NG

Repair

OK

OK

Check the following connector: A-76

Check trouble symptom.

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

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



Disconnect the connector, and measure at the harness side.



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

INSPECTION PROCEDURE 31

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.



Malfunction of the A/C control system



Malfunction of the A/C switch



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



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.



Disconnect the connector, and measure at the harness side.



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

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



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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