ODBII reads MIL, but check engine light off

[Harry]

The flash... I have no idea which scares me. I think I'll see about getting it re-flashed with the right code once I have it passed the smog issue. 

 

As far as the boost, I don't have a gauge to monitor it. I'm assuming either the sensor is bad throwing a false high pressure reading, or the waste-gate isn't operating as it should. Is there a simple way to check the Boost pressure. I can run the ODBII scanner live, what setting/sensor am I looking at (if this is know), and what should it be?

 

2003 Dodge Ram 2500 4x4

3rd Gen 5.9 (non-CA model)

Banks Cold Air intake

[AH64ID]

MAP (Manifold Absolute Pressure) shouldn't show much over 37-38.

[Harry]

Thanks man, is 37-38 under load or when I'm in it? Is there idle and load numbers I should be looking at, I'm guessing my numbers or over pressure is during max boost?

[dorkweed]

Something isn't right here...................................

[Mopar1973Man]

Thanks man, is 37-38 under load or when I'm in it? Is there idle and load numbers I should be looking at, I'm guessing my numbers or over pressure is during max boost?

 

Maybe like this...

[AH64ID]

Thanks man, is 37-38 under load or when I'm in it? Is there idle and load numbers I should be looking at, I'm guessing my numbers or over pressure is during max boost?

No way to know, if it's a MAP sensor issue it could be at any load.

Those numbers are WOT. idle should be around 14.7 depending on pressure altitude.

Can Dodge rehash your truck to your specs?

I'd call them and see what they loaded.

[Harry]

Mopar man, I love the Scan Gauge, looking into one of those.

 

As far as Pressure, 14.3 to 14.7 at idle, 37 WOT, and I can't even hitt 37.1. So now it's back to the dealer to see if they can re-flash it back to what my truck calls for. 

 

Maybe, when they are done, the original issue will be cleared... (Big Dreamer)

[AH64ID]

37 is the max reading OBDII will tell you and correlates to approx 22 psi (forgot about that earlier ). 

 

What are you using to read it? 

 

Idle pressure seems correct, assuming you live around 0-500' elevation. 

 

Look into the Ultra Gauge. I have had both and the UG is better and cheaper, IMHO. 

[Harry]

I'm using the Cen-Tech OBD II & CAN Deluxe Scan Tool. This 37 max read is an issue. So the 2 gauge readers will provide accurate and higher readings? May have to get one of them right away to see where I'm really at.

 

In the mean time, I'm trying to start w/ a reflash of proper code and just see if my issues clear. Really hoping the original MIL status thing just don't return.

[AH64ID]

No, anything that is reading obdii data is limited to 37psia.

Something like an edge attitude or smarty touch should work as they read the data like a DRBIII and not OBDII.

Your cheapest option is a boost gauge.