Mitsubishi Pajero Pinin. Manual - part 49

 

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Mitsubishi Pajero Pinin. Manual - part 49

 

 

GDI – 

Troubleshooting

13A-62

INSPECTION PROCEDURE 23

Engine-ECU power supply and earth circuit system

Probable cause

The cause is probably a malfunction of the engine-ECU or one of the problems
listed at right.

D

Open circuit or short-circuited harness wire in the
engine-ECU power supply circuit

D

Open circuit or short-circuited harness wire in the
engine-ECU earth circuit

D

Malfunction of the engine-ECU

NG

Repair

OK

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

(2),(3) NG

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

(4) NG

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

(5) NG

NG

Repair

OK

Check the trouble symptoms.

NG

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

NG

Repair

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Check the following connectors:
B-18, C-19

Check the following connector:
A-36

OK

Check the trouble symptoms.

NG

Check the harness wire between the
engine-ECU and ignition switch, and
repair if necessary.

Measure at the engine-ECU connectors
C-18, C-19.

D

Disconnect the connector, and
measure at the harness side.

(1) Voltage between 99 and earth

(Ignition switch: ON)
OK: System voltage

(2) Voltage between 57 and earth

OK: System voltage

(3) Voltage between 47, 59 and

earth (Ignition switch: ON)
OK: System voltage (When ter-

minal 57 is shorted to
earth)

(4) Continuity between 46, 58 and

earth
OK: Continuity

(5) Voltage between 60 and earth

OK: System voltage

(1) NG

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

NG

Repair

INSPECTION PROCEDURE 24

Engine control relay and ignition switch-IG system

Probable cause

When the ignition switch ON signal is input to the engine-ECU, the
engine-ECU turns on the engine control relay.
This causes system voltage to be supplied to the engine-ECU and to the
sensors and actuators.

D

Malfunction of the ignition switch

D

Malfunction of the engine control relay

D

Open circuit or short-circuited harness wire of the
engine control relay circuit

D

Malfunction of the engine-ECU

OK

Check the trouble symptoms.

NG

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

OK

Check the engine-ECU power supply
and earth circuit system. (Refer to
P.13A-62, INSPECTION PROCE-
DURE 23.)

OK

Measure at the engine control relay
connector A-43X.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 3, 4 and earth
OK: System voltage

NG

Check the following connector:
A-36

NG

Repair

Check the engine control relay. (Refer
to P.13A-102.)

NG

Replace

GDI – 

Troubleshooting

13A-63

INSPECTION PROCEDURE 25

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, and the engine-ECU uses this signal to carry out functions
such as fuel injection control during starting.

D

Malfunction of the ignition switch

D

Open circuit or short-circuited harness wire
between ignition switch

D

Malfunction of the engine-ECU

(2) NG

NG

Repair

OK

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

NG

Repair

Replace the engine-ECU.

NG

OK

Check the trouble symptoms.

NG

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

NG

Repair

OK

Check the trouble symptoms.

Check the following connector:
C-27

OK

Check the following connector:
C-18

Measure at the engine-ECU connector
C-18.

D

Disconnect the connector, and
measure at the harness side.

(1) Voltage between 68 and earth

(Ignition switch: START)
OK: System voltage

(2) Continuity between 67 and earth

OK: Continuity

(1) NG

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

GDI – 

Troubleshooting

13A-64

INSPECTION PROCEDURE 26

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.

D

Malfunction of the ignition switch

D

Malfunction of the inhibitor switch

D

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

D

Malfunction of the engine-ECU

OK

Check the trouble symptoms.

(2) NG

NG

Repair

OK

Check the trouble symptoms.

NG

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

(3) NG

NG

Repair

OK

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

NG

Repair

NG

Repair

OK

Replace the engine-ECU.

NG

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

OK

Check the trouble symptoms.

NG

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

NG

Repair

OK

Check the trouble symptoms.

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

OK

Check the following connector:
B-04

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

OK

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

D

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
connector.
OK: System voltage

(1) NG

Check the following connectors:
C-18, C-24, D-02

NG

Repair

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

NG

Replace

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

NG

OK

NG

Replace the engine-ECU.

Repair

GDI – 

Troubleshooting

13A-65

INSPECTION PROCEDURE 27

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.

D

Maladjustment of the accelerator cable

D

Maladjustment of the accelerator pedal position switch

D

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

D

Malfunction of the engine-ECU

NG

Repair

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 (1st channel) connec-
tor C-46.

D

Disconnect the connector, and measure at the harness side.

D

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

D

Continuity between terminal 1 and earth
OK: Continuity

NG

Check the following connectors: C-18, C-19

OK

Check trouble symptom.

NG

Check the harness wire between the engine-ECU and accelerator
pedal position sensor 1 (1st channel).

OK

Check the following connector: C-46

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU.

OK

 

 

 

 

 

 

 

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