Mitsubishi Pajero Pinin. Manual - part 133

 

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Mitsubishi Pajero Pinin. Manual - part 133

 

 

ENGINE COOLING – 

Sealants/Special Tool/Troubleshooting

14-3

SEALANTS

Items

Specified sealant

Remarks

Cylinder block drain plug

3M Nut Locking Part No. 4171 or equivalent

Drying sealant

Water pump

Mitsubishi Genuine Parts No. MD970389 or
equivalent

Semi-drying sealant

Water fitting

equivalent

Water outlet fitting

Water by-pass fitting

SPECIAL TOOL

Tool

Number

Name

Use

A

B

C

D

MB991223
A:

MB991219

B:

MB991220

C:

MB991221

D:

MB991222

Harness set
A:

Test harness

B:

LED harness

C:

LED harness
adapter

D:

probe

Measurement of terminal voltage
A: Connector pin contact pressure inspection
B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester connection

TROUBLESHOOTING

INSPECTION CHART FOR TROUBLE SYMPTOMS

Trouble symptoms

Inspection procedure
No.

Reference page

Radiator fan and condenser fan do not operate. <Vehicles with A/C>
Radiator fan does not operate. <Vehicles without A/C>

1

14-4

Radiator fan and condenser fan do not change speed or stop.
<Vehicles with A/C>
Radiator fan does not change speed or stop. <Vehicles without A/C>

2

14-6

Radiator fan does not operate. <Vehicles with A/C>

3

14-7

Condenser fan does not operate. <Vehicles with A/C>

4

14-7

ENGINE COOLING – 

Troubleshooting

14-4

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

Inspection Procedure 1

Radiator fan and condenser fan do not operate. 
<Vehicles with A/C>

Radiator fan does not operate. <Vehicles without A/C>

Probable cause

The cause could be a malfunction of the fan controller power supply or earth circuit.
The cause could also be a malfunction of the fan controller or the engine-ECU.

D

Malfunction of fusible link

D

Malfunction of fan control relay

D

Malfunction of fan controller

D

Malfunction of engine-ECU

D

Malfunction of wiring harness or connector

<Vehicles with A/C>

NG

Replace

OK

(1) NG

Check the harness wire between fan control relay and fusible
link (7), and repair if necessary.

(2) NG

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

(3) NG

Check the harness wire between fan control relay and body earth,
and repair if necessary.

OK

NG

Repair

OK

NG

Replace

Check the automatic compressor-ECU, and repair if necessary.
(Refer to GROUP 55 – Troubleshooting.)

YES

NO

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

Replace the radiator fan motor and fan controller assembly.

OK

Measure at the engine-ECU connectors C-17.

D

Connect the connector.

D

Pull out the terminal No.18 to disconnect it (Ignition switch: ON)
OK: The radiator fan motor and condenser fan motor operate.

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

OK

Measure at the engine-ECU connectors C-17.

D

Connect the connector.

D

Voltage between 18 and body earth 
(Engine: idling, A/C switch: ON)
OK: 0.7 V or more (When A/C compressor is operating)

NG

Check the harness wire between fan controller and engine-ECU.

OK

(1) NG

Check the harness wire between fan controller and fan control
relay, and repair if necessary.

(2) NG

Check the harness wire between fan controller and body earth,
and repair if necessary.

Measure at the fan controller connector A-29.

D

Disconnect the connector, and measure at the harness side
connector.

(1) Voltage between 3 and body earth (Ignition switch: ON)

OK: System voltage

(2) Continuity between 1 and body earth

OK: Continuity

Measure at the fan control relay connector A-42X.

D

Remove the relay, and measure at the harness side connector.

(1) Voltage between 2 and body earth

OK: System voltage

(2) Voltage between 3 and body earth (Ignition switch: ON)

OK: System voltage

(3) Continuity between 1 and body earth

OK: Continuity

D

Fusible link (7) check

D

Fan control relay check (Refer to P.14-11.)

ENGINE COOLING – 

Troubleshooting

14-5

<Vehicles without A/C>

OK

(1) NG

Check the harness wire between fan control relay and fusible
link (7), and repair if necessary.

(2) NG

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

(3) NG

Check the harness wire between fan control relay and body earth,
and repair if necessary.

OK

(1) NG

Check the harness wire between fan controller and fan control
relay, and repair if necessary.

(2) NG

Check the harness wire between fan controller and body earth,
and repair if necessary.

OK

NG

Repair

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

YES

NO

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

Replace the radiator fan motor and fan controller assembly.

OK

Measure at the engine-ECU connectors C-17.

D

Connect the connector.

D

Pull out the terminal No.18 to disconnect it (Ignition switch: ON).
OK: The radiator fan motor operates.

OK

Measure at the engine-ECU connectors C-17.

D

Connect the connector.

D

Voltage between 18 and body earth (Engine: idling)
OK: 0.7 V or more (When radiator fan is operating)

NG

Check the harness wire between fan controller and engine-ECU.

Measure at the fan controller connector A-29.

D

Disconnect the connector, and measure at the harness side
connector.

(1) Voltage between 3 and body earth (Ignition switch: ON)

OK: System voltage

(2) Continuity between 1 and body earth

OK: Continuity

Measure at the fan control relay connector A-42X.

D

Remove the relay, and measure at the harness side connector.

(1) Voltage between 2 and body earth

OK: System voltage

(2) Voltage between 3 and body earth (Ignition switch: ON)

OK: System voltage

(3) Continuity between 1 and body earth

OK: Continuity

D

Fusible link (7) check

D

Fan control relay check (Refer to P.14-11.)

NG

Replace

ENGINE COOLING – 

Troubleshooting

14-6

Inspection Procedure 2

Radiator fan and condenser fan do not change speed or
stop. <Vehicles with A/C>

Radiator fan does not change speed or stop. 
<Vehicles without A/C>

Probable cause

The fan controller carries out step-free control of the radiator fan motor and the
condenser fan motor speeds using signals transmitted from the engine-ECU.

D

Malfunction of fan control relay

D

Malfunction of fan controller

D

Malfunction of engine-ECU

D

Malfunction of wiring harness or connector

<Vehicles with A/C>

OK

NG

Repair

OK

NG

Replace

Check the automatic compressor-ECU, and repair if necessary.
(Refer to GROUP 55 – Troubleshooting.)

YES

NO

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

Replace the radiator fan motor and fan controller assembly.

OK

Measure at the engine-ECU connectors C-17.

D

Connect the connector.

D

Pull out the terminal No.18 to disconnect it (Ignition switch: ON)
OK: The radiator fan motor and condenser fan motor operate.

D

Connect the terminal No.18 to the body earth (Ignition switch: ON)
OK: The radiator fan motor and condenser fan motor stop.

OK

Fan controller check (Refer to P.14-10.)

NG

Replace the radiator fan motor and fan controller assembly.

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

OK

Measure at the engine-ECU connectors C-17.

D

Connect the connector.

D

Voltage between 18 and body earth
(Engine: idling, engine coolant temperature: 80

_

C or less)

OK: 0 – 0.3 V (Engine: idling, A/C switch: ON)
OK: 0.7 V or more (When A/C compressor is operating)

NG

Check the harness wire between fan controller and engine-ECU.

OK

D

Check the harness wire between fan control relay and engine
control relay.

D

Check the harness wire between fan control relay and body
earth.

D

Check the harness wire between fan control relay and fan
controller.

NG

Repair

Fan control relay check (Refer to P.14-11.)

NG

Replace

 

 

 

 

 

 

 

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