Yaris mk3 2017 model 2NR-FKE issues

[BlackAuris]

Hello and happy New Year!!

A family member just got a used petrol 1.5 Yaris with 2NR-FKE engine and we just noticed two things that got us wondering if they are normal or have to look further about them in next few days.

First of all i used an OBD device to check about everything i would think of as important to know for the vehicle condition when the engine is running.

1. Engine coolant temperature is almost always above 93°C with radiator fan is on all the time when driving in city conditions while outside temperature is below 9°C and a few times it goes above 96°C with radiator fan working in high speed.

2.Battery doesn't seem to be in great condition but the charging doesn't help either because voltage don't go more than 13.3-13.5v while driving

Do you think that it might be an issue with alternator?

Anyone knows if these two issues could be considered as normal or not?

Thanks

 

 

[Cyker]

The alternator's a bit tricky as it's a 'smart' one, and runs at a lower-power mode a lot of the time to reduce load on the engine and supposedly increase mpg.

I forget what conditions they will run at full power, but usually it's if there's more load on the 12v system from e.g. headlights and AC, and under braking.

[flash22]

get the Battery and alternator checked, what's the KM/Mileage, does the top rad hose get hot ? does the temp drop if you put the heater on full hot and full fan

take obd2 voltage readings with a pinch of salt, temperature can also be off, especially if it a lower end scan tool

[BlackAuris]

1 hour ago, flash22 said:

get the battery and alternator checked, what's the KM/Mileage, does the top rad hose get hot ? does the temp drop if you put the heater on full hot and full fan

take obd2 voltage readings with a pinch of salt, temperature can also be off, especially if it a lower end scan tool

But then why is temperature gauge needle on the dashboard a little bit off the middle and the radiator fan kicks in all the time?

 

[CPN]

4 hours ago, flash22 said:

take obd2 voltage readings with a pinch of salt

What makes you say that Bob?

[flash22]

A reading is only as good as the software and calibration

 

as for the op's issue, coolant needs changing, cooling system is air locked/blocked, bad thermostat, a failing/worn water pump, worn aux belt, faulty CTS and/or any combination, alternator output is ecu PWM controlled - load dependent

if it's losing coolant, it's either dropping it or burning it, a pressure test on the coolant system will show it