Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 521

13B-40
INSPECTION PROCEDURE 23
Fans (radiator fan, A/C condenser fan) are inoperative.
The fan motor relay is controlled by the power transistor inside the engine-ECU
turning ON and OFF.
Measure at the engine-ECU connector B-28.
Disconnect the connector, and measure at the harness side.
Check the condition of the fans (radiator fan and A/C condenser
fan). (Ignition switch: ON)
OK: Fans are stopped
Voltage between 8 and earth, 21 and earth
(Ignition switch: ON)
OK: System voltage
Connect a jumper wire between 8 and earth
(Ignition switch: ON)
OK: Radiator fan and condenser fan run at high speed.
Connect a jumper wire between 21 and earth
(Ignition swich: ON)
OK: Radiator fan and condenser fan run at low speed.
Check the following connector: B-28
Check the trouble symptoms.
MUT-II Data list
21 Engine coolant temperature sensor
OK: After the engine has warmed up, the engine coolant tempera-
ture durning idling is identical to the MUT-II reading.
Check the thermostat.
Replace the engine-ECU.
MPI –
OK
OK
NG
OK
OK
Troubleshooting
Probable cause
Malfundtion of the fan motor relay
Malfunction of the fan motor
Malfunction of the thermostat
Improper
short-circuited harness wire
Malfunction of the engine-ECU
Yes
Check the radiator fan circuit. (Refer to ELECTRICAL WIRING.)
Check the A/C condenser fan circuit.
(Refer to ELECTRICAL WIRNING.)
NG
Repair
NG
Check the engine coolant temperature sensor system.
(Refer to P.13B-13, INSPECTION PROOCEDURE FOR DIAGNO-
SIS CODE 21.)
NG
Replace
connector contact, open circuit or