CO(H4SO)-8
COOLING
Radiator Main Fan System
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. 1 (+) — Chassis ground (
−
−−
−
):
Is the voltage more than 10 V? Repair the open
circuit in harness
between 20 A fuse
and main 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. 18 from joint box.
3)Check the condition of fuse.
Is the fuse blown out? Replace the fuse. Repair the open
circuit in harness
between main fan
relay and ignition
switch.
10 CHECK MAIN FAN RELAY.
1)Turn the ignition switch to OFF.
2)Remove the main fan relay.
3)Measure the resistance of main fan relay.
Terminal
No. 26 — No. 25:
Is the resistance more than 1
MΩ?
Go to step 11. Replace the main
fan relay.
11 CHECK MAIN FAN RELAY.
1)Connect the battery to terminals No. 27 and
No. 28 of main fan relay.
2)Measure the resistance of main fan relay.
Terminal
No. 26 — No. 25:
Is the resistance less than 1
Ω?
Go to step 12. Replace the main
fan relay.
12 CHECK HARNESS BETWEEN MAIN FAN
RELAY TERMINAL AND MAIN FAN MOTOR
CONNECTOR.
Measure the resistance of harness between
main fan motor connector and main fan relay
terminal.
Connector & terminal
(F17) No. 2 — (F27) No. 25:
Is the resistance less than 1
Ω?
Go to step 13. Repair the open
circuit in harness
between main fan
motor connector
and main fan relay
terminal.
13 CHECK HARNESS BETWEEN MAIN FAN
RELAY AND ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
main fan relay connector and ECM connector.
Connector & terminal
With OBD:
(F27) No. 27 — (B134) No. 14:
Without OBD:
(F27) No. 27 — (B134) No. 3:
Is the resistance less than 1
Ω?
Go to step 14. Repair the open
circuit in harness
between main fan
relay and ECM.
14 CHECK POOR CONTACT.
Check poor contact in connector between main
fan and ECM.
Is there poor contact in con-
nector between main fan motor
and ECM?
Repair the poor
contact connector.
Verify the DTC.
Repair the trouble
cause. <Ref. to
EN(H4SO)(diag)-
39, Read Diagnos-
tic Trouble Code
(DTC).>, <Ref. to
EN(H4SOw/
oOBD)(diag)-24,
Read Diagnostic
Trouble Code
(DTC).>
Step Check Yes No
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