$6E WBo2 AFR Patch-Report Missing MAT and Add MAF Voltage

These instructions apply to any $6E BIN with the WBo2 AFR patch (ARAP, APYP, etc.). Thanks to MikeT88IROC350 at ThirdGen.org for testing these changes.

When reporting of WBo2 AFR was added, reporting of the following items was eliminated:

• Engine Run Time (ERT)
• MAT

These instructions reinstate that reporting. In addition, they provide reporting of MAF Sensor Voltage.

********** IMPORTANT NOTE **********
Before making any changes, be sure to save your current BIN and ADX files.

Hex values referenced below:

00 19 = MSB of ERT
00 1A = LSB of ERT
00 F3 = MAF Sensor A/D Counts
01 70 = WBo2 Sensor A/D Counts

There are 3 reporting options, each of which requires changes to the ADX and BIN (see “Reporting Option Table” below):

Option 1: Report MAF Voltage and MAT, replacing ERT.
Option 2: Re-enable reporting of ERT and replace PROM ID with MAF Voltage and MAT.
Option 3: Re-enable reporting of ERT and replace Total Fuel Delivered with MAF Voltage and MAT
Note that Total Fuel Delivered is not reported in any available ADX.

Required ADX Changes Regardless of Reporting Option

To Report MAT

After the WBo2 patch, the only remaining MAT-related variable is “Scaled” MAT A/D. It is “scaled” (adjusted) for use in Table lookups requiring MAT. In order to report MAT, a Scaled MAT to MAT *F relationship was created (see “Scaled MAT Table” below).
Changes:

• Create a Scaled MAT A/D to MAT *F Lookup Table using the values in the “Scaled MAT Table”.
• Edit the existing ADX Value “Manifold Air Temperature (MAT)”:

- Change the Packet Offset from 29dec to 28dec to obtain Scaled MAT A/D. This Scaled value will be used to access the Scaled MAT Table to report MAT *F.
- On the Conversion Tab, change the Lookup Table selection to point to the Scaled MAT A/D to MAT *F Lookup Table.

To Report MAF Voltage

Add a new ADX Value to report MAF Volts:

Title: MAF Voltage
Units Display: Volts DC
Packet Offset: See Reporting Options Table below for desired reporting Option
Source Data Size: 8 Bit
Conversion Equation: X * 0.019608 to convert the A/D Counts to voltage
Output Format: Floating Point
Output Digits: 2

If desired, an ADX Value could also be added to report MAF Sensor A/D Counts. Just Duplicate the above, but use a Conversion Equation of “X” with Output Digits =0’.

After the above ADX changes, the Table below provides the BIN changes and the additional ADX changes required to report according to the desired Option.

Reporting Option Table
Attachment 17483

Scaled MAT Table
Attachment 17484