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MAFT 2nd Gen wiring for dummies


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#1 mbruneaux

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Posted 06 November 2017 - 04:27 PM

I'm going through the documentation and some very good threads about wiring the 2nd Gen MAFT but would like some clarification from those who know more than I.  I've seen referenced using a Baro sensor but remember reading if a GM MAF was used it wasn't needed. Is this true?

I put this picture together for graphical clarification and would appreciate advise on if it is correct.  Thanks again.


Posted Image

Edited by mbruneaux, 06 November 2017 - 04:29 PM.

Canterbury, CT
1989 Chrysler Conquest TSi (Project Race Car) Build thread http://www.starquest...opic=147910&hl=
2001 Pontiac Grand Prix GTP (Daily Driver)
2003 Chevrolet Suburban 2500 8.1  To tow the two hay burners
1998 BMW 528i 5 Speed because the Suburban gets 10 MPG

Second place is S*** place , eh.  - Stéphane Peterhansel





#2 Turbo Cary

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Posted 07 November 2017 - 10:29 AM

Frequency output goes to the ecu so the ecu still sees a Karman Vortex parameter (factory AFM)

RPM input may require use of a tach adapter. It would be spliced into the ECU RPM input. Ecu still needs an RPM input to turn on fuel pump etc.

TPS signal is spliced.

Wideband should replace factory O2 sensor, have wideband gauge output go to the ECU AND the Maf T. The wideband will be a heated o2 sensor and much more accurate.

#3 mbruneaux

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Posted 10 November 2017 - 11:03 AM

 Turbo Cary, on 07 November 2017 - 10:29 AM, said:

Frequency output goes to the ecu so the ecu still sees a Karman Vortex parameter (factory AFM)

RPM input may require use of a tach adapter. It would be spliced into the ECU RPM input. Ecu still needs an RPM input to turn on fuel pump etc.

TPS signal is spliced.

Wideband should replace factory O2 sensor, have wideband gauge output go to the ECU AND the Maf T. The wideband will be a heated o2 sensor and much more accurate.

Thank you, it makes sense.
Canterbury, CT
1989 Chrysler Conquest TSi (Project Race Car) Build thread http://www.starquest...opic=147910&hl=
2001 Pontiac Grand Prix GTP (Daily Driver)
2003 Chevrolet Suburban 2500 8.1  To tow the two hay burners
1998 BMW 528i 5 Speed because the Suburban gets 10 MPG

Second place is S*** place , eh.  - Stéphane Peterhansel

#4 mbruneaux

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Posted 13 November 2017 - 01:42 PM

View PostTurbo Cary, on 07 November 2017 - 10:29 AM, said:

Frequency output goes to the ecu so the ecu still sees a Karman Vortex parameter (factory AFM)


Which wire to the ECU do I use for Frequency to ECU?  Is it originally from the factory AFS? Is it the White and Black wire going to #2 on the ECU.

Posted Image

Edited by mbruneaux, 13 November 2017 - 02:14 PM.

Canterbury, CT
1989 Chrysler Conquest TSi (Project Race Car) Build thread http://www.starquest...opic=147910&hl=
2001 Pontiac Grand Prix GTP (Daily Driver)
2003 Chevrolet Suburban 2500 8.1  To tow the two hay burners
1998 BMW 528i 5 Speed because the Suburban gets 10 MPG

Second place is S*** place , eh.  - Stéphane Peterhansel

#5 mbruneaux

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Posted 10 April 2018 - 07:30 PM

View Postmbruneaux, on 13 November 2017 - 01:42 PM, said:

Which wire to the ECU do I use for Frequency to ECU?  Is it originally from the factory AFS? Is it the White and Black wire going to #2 on the ECU.

Posted Image

I spliced into the #4 wire.

Finally got it wired and car won't start, going through the gauge monitor I don't see an RPM value.  It stays at 0,  I tapped the white wire from the distributor on the harness side.

Double checked all the wiring but it should start with the RPM and ECU output alone I would think.

Any help is appreciated
Canterbury, CT
1989 Chrysler Conquest TSi (Project Race Car) Build thread http://www.starquest...opic=147910&hl=
2001 Pontiac Grand Prix GTP (Daily Driver)
2003 Chevrolet Suburban 2500 8.1  To tow the two hay burners
1998 BMW 528i 5 Speed because the Suburban gets 10 MPG

Second place is S*** place , eh.  - Stéphane Peterhansel

#6 Turbo Cary

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Posted 13 April 2018 - 03:47 PM

You can't really tap the RPM signal there. You need a tach adapter to properly feed an RPM signal to the unit. I tried the same thing you did and it basically disrupted the signal to the ECU. Remove the rpm wire connection and verify it starts.

#7 mbruneaux

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Posted 13 April 2018 - 04:18 PM

View PostTurbo Cary, on 13 April 2018 - 03:47 PM, said:

You can't really tap the RPM signal there. You need a tach adapter to properly feed an RPM signal to the unit. I tried the same thing you did and it basically disrupted the signal to the ECU. Remove the rpm wire connection and verify it starts.

DIgging through the threads I found the MSD adapter to buy, had to move the car so I went back to the factory MAS and it still won't start, I must have cut something or pulled something out.  I will go through the the manual to find out why it won't start. Cranks and I have fuel pressure but won't fire.
Canterbury, CT
1989 Chrysler Conquest TSi (Project Race Car) Build thread http://www.starquest...opic=147910&hl=
2001 Pontiac Grand Prix GTP (Daily Driver)
2003 Chevrolet Suburban 2500 8.1  To tow the two hay burners
1998 BMW 528i 5 Speed because the Suburban gets 10 MPG

Second place is S*** place , eh.  - Stéphane Peterhansel




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