How does the ECU determine when the vehicle is "cold" for cold start ups?
Honda-Tech Member
Joined: Jan 2004
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From: Charlotte, NC
Re: How does the ECU determine when the vehicle is "cold" for cold start ups? (Beef-Cake)
The coolant temperature sensor reports what it sees, and the ecu follows a curve of temperature vs. fuel correction for various temperature points. The idea is more fuel to warm the car up and not stumble due to cold parts, and it idles the car higher for the same reason.
Joined: Nov 2005
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From: Auckland,NZ, New Zealand
Re: How does the ECU determine when the vehicle is "cold" for cold start ups? (Beef-Cake)
i remember reading something(in HT) about a relay that can stuff up only once its heated due to solder expansion...not sure if thats the case with yours might be worth checking out....sorry no i dont know the name of the relay, something to do with the ignition though...
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Joined: Jan 2003
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Re: How does the ECU determine when the vehicle is "cold" for cold start ups? (Beef-Cake)
It's hard to handle a broad question like this because so many things change over the years. My dad's 1977 Civic didn't even have an ECU.
Depending on what year, there's also the FITV. If your car is old enough to have one of those, it pretty much works by itself without the ECU's help.
But the ECU measures air temperature (IAT sensor) and coolant temperature (ECT sensor).
Depending on what year, there's also the FITV. If your car is old enough to have one of those, it pretty much works by itself without the ECU's help.
But the ECU measures air temperature (IAT sensor) and coolant temperature (ECT sensor).
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