CHT functions help
Thread Starter
|
More Turbo
Joined: Nov 2007
Posts: 534
Likes: 8
From: Melbourne Australia
CHT functions help
Dear Ford Truckers,
for a 2003 F250 5.4 petrol,
What ECU functions does the CHT actually effect, and how??
Cold starts?
AirCon functioning??
My recent engine rebuild with TrickFlow heads has no position to install the stock CHT.
Can I run without one?
Can anyone suggest how I might be able to run one?
Thanks in advance!
for a 2003 F250 5.4 petrol,
What ECU functions does the CHT actually effect, and how??
Cold starts?
AirCon functioning??
My recent engine rebuild with TrickFlow heads has no position to install the stock CHT.
Can I run without one?
Can anyone suggest how I might be able to run one?
Thanks in advance!
Thread Starter
|
More Turbo
Joined: Nov 2007
Posts: 534
Likes: 8
From: Melbourne Australia
Moving along, I am using an excellent aftermarket Coolant Temp & Oil Pressure gauge, with colour change at pre-set levels, plus beeping alarms for ultra high reading alarms.
If I want to make the factory ECM happy, what do I need to feed instead of the sensor to give me a "middle of the dash temp gauge" reading??
Resistor for a set Ohms? other????
If I want to make the factory ECM happy, what do I need to feed instead of the sensor to give me a "middle of the dash temp gauge" reading??
Resistor for a set Ohms? other????
Thread Starter
|
More Turbo
Joined: Nov 2007
Posts: 534
Likes: 8
From: Melbourne Australia
OK....UPDATE
After researchining on the interwebs, it seems that at 90degreesC, the ECU expects to see 2780 Ohms at the CHT sensor.
After a trip to the electronics store, I had a resistor in line instead of the sensor.
I used my OBD2 App to clear codes - only the one for the CHT sensor - and CEL went out, and AirCon started working again!!!!
OBD2 App showed Coolant Temp as 90 degreesC, as per the Ohmage of the resistor.
Dash "Gauge" is still showing zero, regardless of the actual temp of the engine.
Any ideas?
After researchining on the interwebs, it seems that at 90degreesC, the ECU expects to see 2780 Ohms at the CHT sensor.
After a trip to the electronics store, I had a resistor in line instead of the sensor.
I used my OBD2 App to clear codes - only the one for the CHT sensor - and CEL went out, and AirCon started working again!!!!
OBD2 App showed Coolant Temp as 90 degreesC, as per the Ohmage of the resistor.
Dash "Gauge" is still showing zero, regardless of the actual temp of the engine.
Any ideas?
Cargo Master
Joined: Dec 2015
Posts: 2,920
Likes: 515
OK....UPDATE
After researchining on the interwebs, it seems that at 90degreesC, the ECU expects to see 2780 Ohms at the CHT sensor.
After a trip to the electronics store, I had a resistor in line instead of the sensor.
I used my OBD2 App to clear codes - only the one for the CHT sensor - and CEL went out, and AirCon started working again!!!!
OBD2 App showed Coolant Temp as 90 degreesC, as per the Ohmage of the resistor.
Dash "Gauge" is still showing zero, regardless of the actual temp of the engine.
Any ideas?
After researchining on the interwebs, it seems that at 90degreesC, the ECU expects to see 2780 Ohms at the CHT sensor.
After a trip to the electronics store, I had a resistor in line instead of the sensor.
I used my OBD2 App to clear codes - only the one for the CHT sensor - and CEL went out, and AirCon started working again!!!!
OBD2 App showed Coolant Temp as 90 degreesC, as per the Ohmage of the resistor.
Dash "Gauge" is still showing zero, regardless of the actual temp of the engine.
Any ideas?
Thread Starter
|
More Turbo
Joined: Nov 2007
Posts: 534
Likes: 8
From: Melbourne Australia
I have aftermarket TrickFlow heads.
They have NO PLACE for a CHT.
To add to the challenge, my engine guy threw out the original CHT sensor.....
I am trying to run without any CHT. It stops A/C blowing, and it reached 42 degrees C here in Melbourne Australia last week.
Instead of the CHT, I have looped a 2750Ohm resistor beteen the 2 wires from the wiring loom to "tell" the ECU that we have 90 degrees C head temp.....
Doing this had got the A/C working again - and I can see "90 degreesC" on my OBD2 App.
Now the only part not working is the actual dash gauge.
They have NO PLACE for a CHT.
To add to the challenge, my engine guy threw out the original CHT sensor.....
I am trying to run without any CHT. It stops A/C blowing, and it reached 42 degrees C here in Melbourne Australia last week.
Instead of the CHT, I have looped a 2750Ohm resistor beteen the 2 wires from the wiring loom to "tell" the ECU that we have 90 degrees C head temp.....
Doing this had got the A/C working again - and I can see "90 degreesC" on my OBD2 App.
Now the only part not working is the actual dash gauge.
Cargo Master
Joined: Dec 2015
Posts: 2,920
Likes: 515
I have aftermarket TrickFlow heads.
They have NO PLACE for a CHT.
To add to the challenge, my engine guy threw out the original CHT sensor.....
I am trying to run without any CHT. It stops A/C blowing, and it reached 42 degrees C here in Melbourne Australia last week.
Instead of the CHT, I have looped a 2750Ohm resistor beteen the 2 wires from the wiring loom to "tell" the ECU that we have 90 degrees C head temp.....
Doing this had got the A/C working again - and I can see "90 degreesC" on my OBD2 App.
Now the only part not working is the actual dash gauge.
They have NO PLACE for a CHT.
To add to the challenge, my engine guy threw out the original CHT sensor.....
I am trying to run without any CHT. It stops A/C blowing, and it reached 42 degrees C here in Melbourne Australia last week.
Instead of the CHT, I have looped a 2750Ohm resistor beteen the 2 wires from the wiring loom to "tell" the ECU that we have 90 degrees C head temp.....
Doing this had got the A/C working again - and I can see "90 degreesC" on my OBD2 App.
Now the only part not working is the actual dash gauge.
@projectSHO89 any thoughts?
edit: I guess you could take your output wire and ground it -- see if the gauge does anything
Thread
Thread Starter
Forum
Replies
Last Post
123cherry123bob
Engine Swaps
0
Dec 3, 2017 01:23 PM
