GDI ± Troubleshooting
13A-60
INSPECTION PROCEDURE 20
Fans (radiator fan, A/C condenser fan) are inoperative.
Probable cause
The engine-ECU sends a duty signal to the fan controller according to engine coolant
temperature, vehicle speed, or A/C switch.
The fan controller controls radiator fan and condenser fan speeds, based on this
signal. (The closer the terminal voltage comes to 5 V, the higher the fan speed
becomes.)
D Malfunction of the fan motor relay
D Malfunction of the fan motor
D Malfunction of the fan controller
D Open or short circuit, or poor connector contact
D Malfunction of the engine-ECU
NG
Repair
NG
Repair
NG
Repair
Measure at engine-ECU connector C-17.
D Disconnect the connector, measure at the harness side.
D Voltage between terminal 18 and earth
(Ignition switch: ON)
OK: 4.8 ± 5.2 V (The fan runs at high speed.)
D Earth terminal 21.
(Ignition switch: ON)
OK: The fan stops.
NG
Check the following connector: A-29
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and fan control-
ler.
OK
Check the radiator fan and condenser fan circuit. (Refer to GROUP
14 ± Troubleshooting.)
OK
Check the following connector: C-17
OK
Check trouble symptom.
NG
MUT-II Data list
21 Engine coolant temperature sensor
OK: After the engine has been warmed up, the engine coolant
temperature during idling is identical to the MUT-II reading.
NG
Check the engine coolant temperature sensor system. (Refer to
P.13A-19, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
21.)
OK
Check the thermostat.
NG
Replace
OK
Replace the engine-ECU.
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