Suzuki Cultus 2008 EFI - Radiator Auto Fan now working

pwuser163230494871 (Murtuza Ali Subhan) 2021-12-16 15:04:31 +0500 #1

Salaam Everybody,
I have Suzuki Cultus 2008 EFI. Few months ago my car gasket blown up due to overheated (drive by someone). Actually a pipe was leaked and driver did not noticed and finally gasket blown up. Anyway i have fix it by new gasket, replaced all the pipe. After repairing it has been observed radiator auto fan is not working and temp guage is showing high after 20 to 30 min. I checked with radiator wala who advice your radiator is too weak and need to replaced. I have replaced with new one but problem stills persist. I visited electrician who told to replace temperature switch, thermostat valve and still having problem have to check/repair ECU card. First I had changed temperature switch but nothing. While changed Thermostat Valve it has been noticed it was missing. Finally after changing T-Valve the matter resolved immediately and Radiator Fan working automatically.
2 days ago the problem arise again. I have changed again Temperature Switch and Thermostat Valve again but automatic fan NOT working.
Can someone guide me and advise what is the problem and how to fix issue.
Fan is working on Direct by clipping off.
Thanks to everyone for guidance.
Murtuza
03002291640

Hassan1991 (Electrical Engineer ) 2021-12-16 15:48:29 +0500 #2

Wailaikum Assalam
In cultus ecu controls the fan.
Check the relay of radiator fan located in the engine bay fuse box.
And buy new ect sensor.
Not need to change thermostat again and again. You can bench test it.
You can also bench test ect sensor.
And use a scanning tool to see what temperature ecu is reading.

Massive_One (Massive_One) 2021-12-16 16:10:59 +0500 #3

check with a good electrician who can check if ECU is sending signal to sensor, if yes, then sensor is faulty, if no signal to sensor, then ecu is faulty or maybe faulty fuse in the fusebox. check these things.

t-valve na bhi gari main tab bhi agar engine overheat ho to fan on hona chahiye
lekin ap t valve or temp switch pehle hi change karwa chukay hain to check karwain k switch tak signal kyon nahi pohanch raha

pwuser163230494871 (Murtuza Ali Subhan) 2021-12-18 11:32:53 +0500 #4

Thanks your reply. Electrician had checked relay by direct the fan and remove relay and again fix it. it is working as per him.
ECT Sensor means temperature switch in mechanic language, right?
If yes, he has changed it but still having same problem.
For bench test and scanning, understand have to visit Suzuki Authorised repair centre or something else. Please guide. Thank you again for guidance.

pwuser163230494871 (Murtuza Ali Subhan) 2021-12-18 11:34:58 +0500 #5

Noted with thanks. Can you guide us in karachi where to visit for electrician who can check ECU and ECT sensor. Thanking you

Massive_One (Massive_One) 2021-12-18 12:39:14 +0500 #6

sorry brother, i'm from lahore .

Hassan1991 (Electrical Engineer ) 2021-12-18 12:49:32 +0500 #7

Yes you need obd2 scanner to check the temperature. It will also tells you ecu is giving fan signal to turn on or not.
You can do the bench test. Take the sensor off put it in boiling water monitor the temperature of water and resistance of sensor. Then compare it with manual.

mtahir35 (Muhammad Tahir Shiekh) 2022-01-21 15:02:49 +0500 #8

AOA
how to check ECT sensor of efi Cultus
and the pin configration of the sensor
thanks
Tahir

Hassan1991 (Electrical Engineer ) 2022-01-21 15:48:28 +0500 #9

Wailaikum Assalam
Cultus has 3 wire ECT
One wire goes to temperature gauge, second to ecu and last is ground.
You need multimeter and a digital temperature gauge to bench test the ECT.
Then you can dip it inside the hot water along with digital temperature gauge and compare resistance of ECT with temperature. ( To measure resistance you need to connected on probe to ground pin of sensor and other to either cluster temperature gauge pin of ecu pin ECT).
You can find the resistance values of ECT with respect to temperature in service manual.