Mitsubishi Pajero Pinin 1999 - Page 198

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.)