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
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст