CO(H4SO)-11
COOLING
Radiator Sub Fan System
6 CHECK POWER SUPPLY TO SUB FAN RE-
LAY.
1)Turn the ignition switch to ON.
2)Measure the voltage between sub fan relay
terminal and chassis ground.
Connector & terminal
(F27) No. 20 (+) — Chassis ground (
−
−−
−
):
Is the voltage more than 10 V? Go to step 10. Go to step 9.
7 CHECK 20 A FUSE.
1)Remove the 20 A fuse from A/C relay holder.
2)Check the condition of fuse.
Is the fuse blown out? Replace the fuse. Go to step 8.
8 CHECK POWER SUPPLY TO A/C RELAY
HOLDER 20 A FUSE TERMINAL.
Measure the voltage of harness between A/C
relay holder 20 A fuse terminal and chassis
ground.
Connector & terminal
(F27) No. 3 (+) — Chassis ground (
−
−−
−
):
Is the voltage more than 10 V? Repair the open
circuit in harness
between 20 A fuse
and sub fan relay
terminal.
Repair the open
circuit in harness
between main fuse
box connector and
20 A fuse terminal.
9 CHECK FUSE.
1)Turn the ignition switch to OFF.
2)Remove the fuse No. 17 from joint box.
3)Check the condition of fuse.
Is the fuse blown out? Replace the fuse. Repair the open
circuit in harness
between sub fan
relay and ignition
switch.
10 CHECK SUB FAN RELAY.
1)Turn the ignition switch to OFF.
2)Measure the resistance of sub fan relay.
Terminals
No. 17 — No. 18:
Is the resistance more than 1
MΩ?
Go to step 11. Replace the sub
fan relay.
11 CHECK SUB FAN RELAY.
1)Connect the battery to terminals No. 20 and
No. 19 of sub fan relay.
2)Measure the resistance of sub fan relay.
Terminals
No. 17 — No. 18:
Is the resistance less than 1
Ω?
Go to step 12. Replace the sub
fan relay.
12 CHECK HARNESS BETWEEN SUB FAN RE-
LAY TERMINAL AND SUB FAN MOTOR
CONNECTOR.
Measure the resistance of harness between
sub fan motor connector and sub fan relay ter-
minal.
Connector & terminal
(F16) No. 2 — (F27) No. 17:
Is the resistance less than 1
Ω?
Go to step 13. Repair the open
circuit in harness
between sub fan
motor and sub fan
relay connector.
13 CHECK HARNESS BETWEEN SUB FAN RE-
LAY AND ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
sub fan relay connector and ECM connector.
Connector & terminal
With OBD:
(F27) No. 19 — (B134) No. 13:
Without OBD:
(F27) No. 19 — (B134) No. 12:
Is the resistance less than 1
Ω?
Go to step 14. Repair the open
circuit in harness
between sub fan
relay and ECM.
Step Check Yes No
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