MAP readings KOEO?
- Thread starter Turbo1dr
- Start date
JSM
Active member
Re: MAP readings KOEO?
Uh NO.
4.5volts would be full signal. 1 bar well you would be correct. 2 bar atmos should be about 2.5 volts, 3 bar is (1/3 * 5 volts) or 1.67 volts.
Uh NO.
4.5volts would be full signal. 1 bar well you would be correct. 2 bar atmos should be about 2.5 volts, 3 bar is (1/3 * 5 volts) or 1.67 volts.
Re: MAP readings KOEO?
BTW, this trunk was a stolen/recovery that had a campershell, regular S-10 wheels and hardly looked like a Syclone when the customer bought it. There's no telling what the number of the ECM/CalPack/Chip is actually in the truck. I'll have to do more investigating...
BTW, this trunk was a stolen/recovery that had a campershell, regular S-10 wheels and hardly looked like a Syclone when the customer bought it. There's no telling what the number of the ECM/CalPack/Chip is actually in the truck. I'll have to do more investigating...
turbodig
Active member
Re: MAP readings KOEO?
What you're seeing is a bug... the stock baro routines don't always work correctly.
Pull ECMB, and re-try the key-on sequence... eventually you'll get it to read in the 97-100 area.
Basically, the ECM is looking for ignition voltage to be in a 4-9v range, which is only supposed to happen as you're turning on the key- ie, voltage is "coming up" to full system voltage.
The downer is that the same thing happens on key off. If the motor is running as key off is done, it can actually pull a bit of vacuum as the motor is still spinning.
The 54.x value is actually a default that gets used when the routine gets confused.
I've been working on this part of the code for quite some time, but I still don't have it quite correct.
Furthermore, I don't really trust the readings of the sensor when the voltage is less than full, so I'm not sure the key-on is entirely valid.
*EDIT* - rereading this again - You're saying *MAP* is at 54.x at key on? That would again point to a default, a dead MAP condition.
Alternatively, if you had a 3 bar sensor plugged into a truck with a 2 bar chip, you might see numbers like that.
What you're seeing is a bug... the stock baro routines don't always work correctly.
Pull ECMB, and re-try the key-on sequence... eventually you'll get it to read in the 97-100 area.
Basically, the ECM is looking for ignition voltage to be in a 4-9v range, which is only supposed to happen as you're turning on the key- ie, voltage is "coming up" to full system voltage.
The downer is that the same thing happens on key off. If the motor is running as key off is done, it can actually pull a bit of vacuum as the motor is still spinning.
The 54.x value is actually a default that gets used when the routine gets confused.
I've been working on this part of the code for quite some time, but I still don't have it quite correct.
Furthermore, I don't really trust the readings of the sensor when the voltage is less than full, so I'm not sure the key-on is entirely valid.
*EDIT* - rereading this again - You're saying *MAP* is at 54.x at key on? That would again point to a default, a dead MAP condition.
Alternatively, if you had a 3 bar sensor plugged into a truck with a 2 bar chip, you might see numbers like that.