16196395 PCM

[zero-E]

Hello, new to this forum as far as joining. Been checking it out for a while though.
Bought a 1994 c1500 about 3 years ago from someone who totally screwed this thing up took me a long time to get this thing back so it will run again, but Im missing one thing I need to get it running properly.

The MAT (manifold air temp) sensor and wiring is missing and my OBD tester says the air temp is -40F, and of course it runs very rich. The last part of the puzzle.

Was hoping someone would have the pinout for the PCM that shows the MAT input and output (2 wires) . Ive literally searched for this online for quite a while and cannot find what I need. think I'll just run new wires from the back of the PCM to the sensor. Tired of searching for cut off wires (there has been a few).

The 427 is the same PCM as I understand but i can't find that one either.

The previous owner should not be allowed to touch any sharp tools in my opinion, he had the spark advance unhooked, 454 high output injectors etc etc etc on and on

 

[df2x4]

Welcome!

Have you checked the '94 factory service manuals? You can download them here for free. I know my '97 manuals have complete PCM pinouts.

https://www.gmt400.com/threads/88-95-service-manuals.43575/

 

[1997]

this site should help you out ....

1994 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS With A/T)

GM 4.3L, 5.0L, 5.8L Index of Articles

troubleshootmyvehicle.com

simpler to decipher, imo, than GM manual

 

[PlayingWithTBI]

The MAT (manifold air temp) sensor and wiring is missing and my OBD tester says the air temp is -40F, and of course it runs very rich. The last part of the puzzle.

Was hoping someone would have the pinout for the PCM that shows the MAT input and output (2 wires) . Ive literally searched for this online for quite a while and cannot find what I need

Here's some documentation on both PCMs scroll down to the schematics. I don't remember a TBI using an MAT, are you sure that's what your looking for instead of a CTS (Coolant Temp Sensor) or maybe an IAT (Intake Air Temp) sensor? Just because a scanner shows that doesn't mean it's germane to your particular application, HTH

16196395 PCM Information $OE

16196395 PCM Information $OE This PCM was used in 1994 C/K Truck, Van, 5.7L & 7.4L (HD) 4L80E Auto Trans or Manual Trans. Also the 16197427 came in these trucks as well and it will run $31, $OD, $OE, $E6 mask.

www.gearhead-efi.com

16197427 PCM Information $0D

16197427 PCM Information $0DThis PCM was used in 1994 - 1995 C/K Truck, Van, S-10, 4.3L, 5.7L & 7.4L The 16197427 came in many trucks and can run $31, $0D, $0E, $E6 mask. Click Here for thread on changing a 1227747 ECM to 16197427 PCM Pin by Pin! Click Here for long thread discussing...

www.gearhead-efi.com

 

[zero-E]

Here's some documentation on both PCMs scroll down to the schematics. I don't remember a TBI using an MAT, are you sure that's what your looking for instead of a CTS (Coolant Temp Sensor) or maybe an IAT (Intake Air Temp) sensor? Just because a scanner shows that doesn't mean it's germane to your particular application, HTH

16196395 PCM Information $OE

16196395 PCM Information $OE This PCM was used in 1994 C/K Truck, Van, 5.7L & 7.4L (HD) 4L80E Auto Trans or Manual Trans. Also the 16197427 came in these trucks as well and it will run $31, $OD, $OE, $E6 mask.

www.gearhead-efi.com

16197427 PCM Information $0D

16197427 PCM Information $0DThis PCM was used in 1994 - 1995 C/K Truck, Van, S-10, 4.3L, 5.7L & 7.4L The 16197427 came in many trucks and can run $31, $0D, $0E, $E6 mask. Click Here for thread on changing a 1227747 ECM to 16197427 PCM Pin by Pin! Click Here for long thread discussing...

www.gearhead-efi.com

Yes it is the IAT, sorry thought GM called it MAT everything else checks out coolant temp, knock sensor ,and all (he had that unhooked too) just shows me air temp -40F thanks for the welcome
that site, which I joined several years ago says they deleted them due to copyright.

 

[PlayingWithTBI]

just shows me air temp -40F thanks for the welcome

No problem. Don't worry about the IAT your PCM probably doesn't use one.

 

[zero-E]

this site should help you out ....

1994 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS With A/T)

GM 4.3L, 5.0L, 5.8L Index of Articles

troubleshootmyvehicle.com

simpler to decipher, imo, than GM manual

Thanks for the link, but it don't show anything for IAT or MAT

 

[zero-E]

Welcome!

Have you checked the '94 factory service manuals? You can download them here for free. I know my '97 manuals have complete PCM pinouts.

https://www.gmt400.com/threads/88-95-service-manuals.43575/

Thanks for that. still looking through that many many pages

No problem. Don't worry about the IAT your PCM probably doesn't use one.

I think it needs that for cold weather starting and as an indicator for fuel mixture

 

[1998_K1500_Sub]

No problem. Don't worry about the IAT your PCM probably doesn't use one.

Agreed, I suspect it doesn't use one.

I had two 1995 S10s both with 4.3L VIN Z TBI and neither had IAT. One engine used the 16197427 in the cab, the other engine used a "pre-OBDII" ECU under the hood.

I had a 1995 S10 Blazer with 4.3L VIN W CPFI (central point fuel injection) and it DID have an IAT. It used the 16197427 ECU in the cab.

So there's one example of a single model year w/ the same engine (except their intake / fuel inj / cam) where different configurations had / did not have the IAT.

 

[PlayingWithTBI]

I think it needs that for cold weather starting and as an indicator for fuel mixture

No, the PCM will pull timing based on how hot the IAT gets, it won't do anything if it's cold. Your CTS does that.

I had a 1995 S10 Blazer with 4.3L VIN W CPFI (central point fuel injection) and it DID have an IAT.

Probably because it was a Vortec, not a TBI?