3 Bar MAP sensor doesn't work with 3 Bar scaling!

[caver]

Whats the voltage out of the map sensor at key on? May be a problem there.

[GMPX]

Howard,

Does this match what you see.....this is from the 3bar sensor I have here # 16040749.

Measured voltage at the MAP sensor, engine not running = 1.54V
Here's the comparison between what the scaler is set to {C6301} and what the MAP value in the scan tool is showing....

94.4 = 39kPa
180 = 68kPa
288 = 99kPa

Cheers,
Ross

[Redline Motorsports]

Ross,

I am going to check out these voltage readings tomorrow. I have a fluke meter hanging out of the back of the MAP sensor harness to pickup the readings. It seemed correct everytime we made a MAP or scaling change. IK was just wondering why it never matched the FS's voltage PID.

One of the posts stated something about creating a new PID to read the raw voltage. How do you do that and has is that different then the current PID that is show in the selectable list?

Finally, is it possible that the way the custom OS is designed that some PIDS don't work as normal??

Thanks for the continuing help!

Howard

[GMPX]

Ross,

I am going to check out these voltage readings tomorrow. I have a fluke meter hanging out of the back of the MAP sensor harness to pickup the readings. It seemed correct everytime we made a MAP or scaling change. IK was just wondering why it never matched the FS's voltage PID.

One of the posts stated something about creating a new PID to read the raw voltage. How do you do that and has is that different then the current PID that is show in the selectable list?

Finally, is it possible that the way the custom OS is designed that some PIDS don't work as normal??

Thanks for the continuing help!

Howard

Hi Howard,

Between the email's and forum posts I get so confused sometimes
Anyway, for others reading this thread one way to confirm what MAP sensor you have is to read the voltage (with a voltmeter) at the terminals of the sensor with the key on, engine not running.
A 1 bar will read about 4.8V or there abouts (depends on alt as well).
A 3 bar will be about 1.5V and a 2bar somewhere in between.
But remember, the PCM MAP scaling calibration will have no effect at all on what a multimeter reads at the MAP terminals.

The voltage PID's were changed in the scantool not long ago, Paul has said they were causing an issue with black box logging (feel free to chime in Paul).

No problem with the help Howard and big thanks to Jesse too, I hope after all this we have all learn something to help in the future.

Cheers,
Ross

[QUICKSILVER2002]

Did the MAP sensor offset (c6302) somehow get changed.

I have a 2bar sensor in my car and the scaler is set to 190.

[Redline Motorsports]

Here is where I stil stand with this issue;

3 Bar Map sensor part # 12223861

Key on (no start) 1.579 volts

2 Bar Map sensor part # 16254539

Key on (no start) 2.290 volts w/scaler set to 194


The Flashscan with the 3 Bar Map reads .830 volts at 55 KPA
The Flashacan with the 2 Bar Map reads 1.030 volts at 51 KPA

The only way the car runs clean is when the scaling is set to 94. This is regardless of which MAP sensor is used. As soon as I scale the MAP to the rerquired values (194 for 2 Bar) and (288 for 3 Bar) that car runs worse. Actually when the scale is set to 288 it runs the worse and as you go to 194 and eventually back to 94 it runs noticably better.

The Flashcan kpa readings also match my kpa readings off my dynos 5 bar map.

WTF is the problem??

Howard

[VetPet]

Howard, I would be very much obliged if you could outline what is missing from the AutoVE tutorial as I'm sure others would also benefit from what you've learnt.

[Redline Motorsports]

Here are a few more things I checked;

2 Bar Map scaled to 194

Dyno map reading was 62 KPA and the Flashscan read 114 KPA

Same Map scaled to 125

Dyno map reading was 60 KPA and the Flashscan read 80 KPA

Same Map scaled at 94

Dyno and Flashscan read the same.

[QUICKSILVER2002]

Here are a few more things I checked;

2 Bar Map scaled to 194

Dyno map reading was 62 KPA and the Flashscan read 114 KPA

Same Map scaled to 125

Dyno map reading was 60 KPA and the Flashscan read 80 KPA

Same Map scaled at 94

Dyno and Flashscan read the same.

This may be a stupid question. But are you 100% sure you wired the new sensor into the correct wires/connector.

Also, what does c6302 read in your file.

[Redline Motorsports]

Not a stupid question. but....I did check it. This was backed up by the volt meter readings that I monitered with a volt meter. Ground, +5 volts, and voltage output!

The {6302} MAP Sensor Offset is set to 10.

For whatever its worth its COS # 02040003.

Howard