Hyundai r35z-7 Workshop Manual page 209

3. WHEN COOLANT OVERHEAT WARNING LAMP LIGHTS UP(Engine is started)
Before disconnecting the connector, always turn the starting switch OFF.
Before carrying out below procedure, check all the related connectors are properly inserted.
After checking, insert the disconnected connectors again immediately unless otherwise specified.
Check resistance
YES
between water
temp switch and
chassis?
Disconnect CD-9
Does display go
Yes 0~1.1
off when
No =
disconnect CD-9
and CN-167?
Starting switch : ON
Engine : Start
Check resistance
between CN-56
NO
(4) and chassis?
Disconnect CN-56
Yes
No =
CLUSTER
4
CN-56
YES
NO
YES
NO
0~1.1
3
CN-2
CN-8
Cause
Coolant overheat
(110 C 2 C )
or defective temp
switch
Defective temp
detector
Short circuit in
wiring harness
Defective cluster
WATER TEMP SWITCH
CD-9
13
5-26
Remedy
Check engine
cooling system
or replace temp
switch
Repair or replace
the detector
Repair or replace
(After clean)
Replace
C
DETECTOR
7
CN-167
R35Z75TS12