Mitsubishi Pajero Pinin. Manual - part 121

 

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Mitsubishi Pajero Pinin. Manual - part 121

 

 

MPI <4G9> – 

Troubleshooting

13C-70

OK

Check the trouble symptom.

NG

Replace the fuel pump.

OK

Check the following connector:
D-17

NG

Repair

NG

Check the harness wire between the
fuel pump and earth, and repair if neces-
sary.

Check the trouble symptom.

NG

Repair

OK

(2) NG

Check the following connector:
D-12

NG

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

OK

Check the trouble symptom.

(1) NG

Check the following connectors:
D-17, C-24<LHD>, C-26<RHD>, A-41X

NG

Repair

NG

Measure at fuel pump connector D-17.

D

Disconnect the connector, and
measure at the harness side.

(1) Voltage between terminal 1 and

earth
(Ignition switch: ON)
OK: System voltage

(2) Continuity between 2 and earth

OK: Continuity

NG

Replace the engine-ECU.

OK

Check the trouble symptom.

OK

Check the following connector:
C-87

NG

Repair

OK

Measure at the engine-ECU
connector C-87.

D

Disconnect the connector, and
measure at the harness side.

D

Short circuit between terminal 22
and earth (Ignition switch: ON)
OK: The fuel pump operates (its

operation sound can be
heard).

NG

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

Check the trouble symptom.

NG

Repair

OK

NG

Check the following connector:
C-87, A-41X

OK

Measure at the engine-ECU
connector C-87.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between terminal 22 and
earth (Ignition switch: ON)
OK: System voltage

NG

Repair

OK

Check the ignition switch. (Refer to
GROUP 54 – Ignition Switch and Immo-
bilizer System.)

NG

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

OK

Check the trouble symptom.

NG

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

NG

Repair

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

From the previous page

MPI <4G9> – 

Troubleshooting

13C-71

INSPECTION PROCEDURE 28

Ignition switch-ST system

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.

D

Malfunction of the ignition switch

D

Malfunction of the inhibitor switch <A/T>

D

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

D

Malfunction of the engine-ECU

<M/T>

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Check the following connector:
C-90

NG

Repair

NG

Repair

OK

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

NG

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

OK

Check the trouble symptoms.

NG

Check the following connectors:
C-90, A-86, C-27, C-61

NG

Repair

Measure at the engine-ECU connector
C-90.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 71 and earth
(Ignition switch: START)
OK: 8 V or more

<A/T>

Measure at the inhibitor switch connector B-04.

D

Disconnect the connector, and measure at the harness
side.

D

Voltage between 10 and earth (Ignition switch: START)
OK: System voltage

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

NG

Repair

OK

Check the following connector: C-90

NG

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

NG

Repair

OK

Check the trouble symptoms.

NG

Check the following connectors: A-86, B-01, B-04 C-90

OK

Measure at the engine-ECU connector C-90.

D

Disconnect the connector, and measure at the harness
side.

D

Voltage between 71 and earth
(Selector lever position: P or N)
(Ignition switch: START)
OK: System voltage

NG

Repair

OK

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

NG

Check the harness wire between inhibitor switch and ignition switch.

NG

Repair

OK

Check the trouble symptoms.

NG

Check the following connector: B-04, C-02, C-39, C-61

OK

Check the inhibitor switch

D

Continuity between 9 and 10 
(Refer to GROUP 23 – On-vehicle service.)

NG

Replace

MPI <4G9> – 

Troubleshooting

13C-72

INSPECTION PROCEDURE 29

A/C switch and A/C relay system

Probable cause

When an A/C ON signal is input to the engine-ECU, the engine-ECU carries out
control of the idle speed control (ISC) servo, and also operates the A/C compressor
magnetic clutch.

D

Malfunction of A/C control system

D

Malfunction of A/C switch

D

Improper connector contact, open circuit or
short-circuited harness wire

D

Malfunction of the engine-ECU

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

NG

Replace

OK

Measure at the engine-ECU connector C-87.

D

Disconnect the connector, and measure at the harness side.

D

Voltage between 8 and earth
(Ignition switch: ON)
OK: 0  – 3 V (A/C switch: OFF)

System voltage (A/C switch: ON)

D

Short circuit between 8 and earth
(Ignition switch: ON, A/C switch: ON)
OK: A/C compressor clutch turns on.

NG

Check the A/C system. (Refer to GROUP 55 – Troubleshooting.)

OK

Check the following
connector: 
C-87

NG

Replace

OK

Check the trouble symptom.

NG

Replace the engine-ECU.

INSPECTION PROCEDURE 30

Ignition circuit system

Probable cause

The engine-ECU interrupts the ignition coil primary current by turning the 
power transistor inside the engine-ECU ON and OFF.

D

Malfunction of ignition coil.

D

Malfunction of ignition failure sensor.

D

Improper connector contact, open circuit or
short-circuited harness wire

D

Malfunction of the engine-ECU

OK

To the next page

OK

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

NG

Check the harness wire
between the ignition fail-
ure sensor and ignition
switch connector.

NG

Repair

OK

Check the trouble symptom.

NG

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

NG

Repair

Measure at the ignition failure sensor connector A-90.

D

Disconnect the connector and measure at the harness side.
Voltage between 4 and ground (Ignition switch: ON)
OK: System voltage

OK

OK

Check the ignition failure sensor.
(Refer to GROUP 16 – Ignition
System.)

NG

Replace

Check the ignition coil. (Refer to
GROUP 16 – Ignition System.)

NG

Replace

MPI <4G9> – 

Troubleshooting

13C-73

OK

Replace the ignition failure sensor.

NG

Check the harness wire
between the engine-ECU
and the ignition failure
sensor connector.

NG

Repair

Replace the engine-ECU.

OK

OK

Check the trouble symptom.

NG

Check the following
connectors:
 C-89, 
A-90

NG

Repair

Measure at the engine-ECU connector C-89.

D

Measure with the connector connected.

D

Voltage between 58 and earth
(Engine: Cranking or 3,000 r/min)
OK: 0.3  – 3.0 V

OK

Check the harness wire between the ignition failure sensor and
earth, and repair if necessary.

(2) NG

There is an open or short-circuit the ignition signal output harness
of the ignition failure sensor, so check and repair the harness.

(1) NG

Measure at the ignition failure sensor connector A-90.

D

Disconnect the connector and measure at the harness side.

(1) Voltage between 2 and earth (Ignition switch: ON)

OK: 4 V or more

(2) Continuity between 1 and earth

OK: Continuity

NG

OK

Check the trouble symptom.

OK

Check the following connectors:
A-13, A-14

NG

Repair

(3) NG

Check the harness wire between
the ignition coil connector and
ground, and repair if necessary.

OK

Replace the engine-ECU.

NG

Check the harness wire between
the engine-ECU and ignition coil
connector.

NG

Repair

OK

Check the trouble symptom.

(2) NG

Check the following connector:
C-87, A-90

NG

Repair

NG

Check the harness wire between the
ignition coil and ignition failure sensor
connector, and repair if necessary.

OK

Check the trouble symptom.

(1) NG

Check the following connector:
A-13, A-14, A-90

NG

Repair

OK

Measure at the ignition coil connectors
A-13, A-14.

D

Disconnect the connector, and
measure at the harness side.

(1) Voltage between 1 and earth 

(Ignition switch: ON)
OK: Battery positive voltage

(2) Voltage between 3 and earth 

(Engine: Cranking)
OK: 0.5  – 4.0 V

(3) Continuity between 2 and earth

OK: Continuity

From the previous page

 

 

 

 

 

 

 

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