Unfortunately, the 1226870 is an oddball one-year one-model ECM that was only used on the 1985 corvette.  It is for a TPI setup with an electronically controlled distributor and features 160 baud ALDL communication for logging.  It is a unique ECM.  There are no other ECMs that are a “plug and play” swap without extensive wiring changes. (see “ECM Conversions” below) The ECM uses a 24 pin 2732 EPROM.  A G2 0.6″ chip adapter (solder/desolder install) can be used to install a 28 pin chip or use any of our OBD1 GM tuning gear.

No other masks from other ECMs can be trivially used.  It uses the $1F mask, which is supported by TunerPro RT.

Hardware Required for Tuning

• G2 Chip adapter and C2 27SF512 chip required to reprogram ECM.  WARNING: This is NOT plug and play!  Desoldering factory chip is required and soldering install for G2 adapter.  (view install)  Order the “Install Service” and send us your ECM if you’re not comfortable with soldering work.
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 and SocketBooster 1.0 required for real time tuning
• APU1 AutoPROM All-in-one device works great (without SocketBooster), taking the place of BURN2, ALDU1+CABL1 and Ostrich2
• APU1 works great for the application and is the recommended hardware in addition to the G2.

Software Required for Tuning

These computers use the $1F mask from the factory.

TunerPro RT + the $1F definitions works for editing and datalogging.  (this is the recommended software.  It is included with the AutoProm)  Additional/alternate definitions available from Gearhead-efi.com

TunerCat OBD1 tuner with the $1F definition works for editing.

WinALDL works for datalogging.

ECM Conversions

(disclaimer: blatant opinion) The 1226870 is not the high point of OBD1 GM engine management.  It is possible to swap to other ECMs which do better.

1227165 (86-89 TPI MAF) swap

1227730 (90-92 TPI MAP) swap

12200411 (99-02 F body) swap

This is one of the first electronically-shifted transmission applications.  Some 1991-93 vehicles came equipped with 4L80E transmissions and 16147060 PCMs.  This is a P4 generation ECM which speaks ALDL at 8192 baud and have removable “memcals.”  This was a one-year PCM which was followed by the 16168625 / 16197427 in later years.

Hardware for Tuning

• G1 Chip adapter and C2 27SF512 chip required to reprogram ECM
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 required for real time tuning
• APU1 AutoPROM All-in-one device works great, taking the place of BURN2, ALDU1+CABL1 and Ostrich2

Software for Tuning

These computers can be kind of tricky.  the $85 mask was the original but it was replaced with $D8.  You’ll need to read the memcal using a HDR1 to determine exactly which mask you have OR download a known starter bin to use from gearhead-efi or other sources.  Be warned: software support for this setup is not anywhere near as complete as the later $0D/$OE masks which followed.

$85 information page on gearhead-efi

$D8 information page on gearhead-efi

TunerPro RT + definitions from gearhead-efi works for editing and datalogging.  (this is the recommended software.  It is included with the AutoProm)

TunerCat OBD1 tuner with the appropriate definition works for editing.

Recommended Hardware to Buy

1. G1 + BURN2 + C2 = most basic
2. G1 + BURN2 + C2 + ALDU1 w/ CABL1 = basic with logging capabilities
3. G1 + APU1 = Chip tune / realtime tune / datalog – full capabilities
4. G1 + APU1 + wideband = full capabilites with wideband logging

The 84-87 Grand National was a unique car available in limited production. These vehicles featured sequential injection, distributorless ignition systems and other groundbreaking features. A combination of unusual and off the shelf ECMs/electronic components make for some unique needs.

These vehicles used two ECMs. 84-85 vehicles came equipped with the 1226459 and 86-87 vehicles came equipped with the 1227148.  These ECMs were used in a very select few other V6 vehicles of this generation with different programming for non-turbo applications.  It is possible to swap the 86-87 computers into the earlier vehicles.  Datalogging is improved with the later computers.

The Grand Nationals have a cult following.  There is a lot of information to be found in general on www.gnttype.org and the chips/ECMs are covered especially here.

Hardware Required for Tuning

• The “early” 84-85 1226459 use the G2 *** 0.6″ *** Chip adapter
• The “late” 86-87 1227148 use the G2 *** 0.45″ *** Chip adapter
• To reprogram the ECM, both adapters accept a 28 pin EPROM like the C2 27SF512 chip.
• WARNING: This is NOT plug and play!  Desoldering factory chip is required and soldering install for G2 adapter.  (view install)  Order the “Install Service” and send us your ECM if you’re not comfortable with soldering work.
• After a chip adapter is installed, our “standard” OBD1 GM tools can be used:
  • BURN2 chip programmer programs chips
  • ALDU1+CABL1 cable allows laptop to log data with appropriate software
  • Ostrich 2 with SocketBooster allows real time tuning while vehicle is running
  • APU1 / AutoProm programs chips, logs data and allows realtime programming in one unit along with optional wideband logging.
  • TunerPro RT can be used with the $1D (84-85) or $31T /1227148Turbo (86-87) definitions for editing and logging

The 1993 Camaro / Corvette LT1 PCM 16159278 is an oddball.  It was not used before or since.  The $DA2 mask was used in Y-body Corvettes and the $DA3 mask was used in F-body Camaro/Firebirds.

Hardware for Tuning

• G1 Chip adapter and C2 27SF512 chip required to reprogram ECM
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 required for real time tuning
• APU1 AutoPROM All-in-one device works on some vehicles but many have issues datalogging reliably.  This is NOT recommended for this platform, please buy BURN2/Ostrich2/ALDU1 instead.  Using an ALDU1 in addition to the APU1 solves any issues, if you already have an APU1 on hand.  Temporarily pulling the fuse for the CCM while tuning the ECM may also help.

Software for Tuning

These computers use the $DA2 or DA3 masks from the factory.  The $DA2 mask was used in Y-body Corvettes and the $DA3 mask was used in F-body Camaro/Firebirds.

TunerPro RT + the $DA2 or $DA3 definitions works for editing and datalogging.    (It is included with the AutoProm)

TunerCat OBD1 tuner with the appropriate definition works for editing.

TTS Datamaster with the appropriate definition works for datalogging. (this is the recommended software)

Recommended Hardware to Buy

1. G1 + BURN2 + C2 = most basic
2. G1 + BURN2 + C2 + ALDU1 w/ CABL1 = basic with logging capabilities
3. G1 + BURN2 + C2 + ALDU1 w/ CABL1  + Ostrich2 = Chip tune / realtime tune / datalog – full capabilities

Starting around 1992, GM started putting the newer electronically controlled 4L60E and 4L80E transmissions in their trucks.  Along with the electronically controlled transmissions came new ECMs that speak ALDL at 8192 baud and have removable “memcals” – 16197427, 16196395, 16156930, 16168625.  These ECMs are largely interchangeable – as a rule of thumb, any of the 4 hardware boxes ( 16197427, 16196395, 16156930, 16168625 ) can run any of the 4 main masks ( $0D, $0E, $31 or $E6 ) BUT you will have issues using a V6 memcal for a V8 application or vise versa.  Your memcal MUST be from a vehicle that has the same number of cylinders as the engine you are trying to run.

You can also use these PCMs for standalone transmission controllers.

Hardware for Tuning

• G1 Chip adapter and C2 27SF512 chip required to reprogram ECM
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 required for real time tuning
• APU1 AutoPROM All-in-one device works great, taking the place of BURN2, ALDU1+CABL1 and Ostrich2

Software for Tuning

These computers use the $0D, $0E, $31 or $E6 masks from the factory.  The $0D and $E6 are generally found on 4L60E trucks.  The $31 and $0E are generally found on 4L80E equipped trucks.

TunerPro RT + the $0D, $0E, $31 or $E6 definitions works for editing and datalogging.  (this is the recommended software.  It is included with the AutoProm)

TunerCat OBD1 tuner with the appropriate definition works for editing.

TTS Datamaster with the appropriate definition works for datalogging.

Recommended Hardware to Buy

1. G1 + BURN2 + C2 = most basic
2. G1 + BURN2 + C2 + ALDU1 w/ CABL1 = basic with logging capabilities
3. G1 + APU1 = Chip tune / realtime tune / datalog – full capabilities
4. G1 + APU1 + MTX-L = full capabilites with wideband logging

The 96-97 F and Y bodies use a unique PCM that is an evolution of the 94-95 ECM but requires unique tools.  They are primarily tuned by reflash over the OBD2 diagnostic port, NOT by programming and replacing chips.  (Although this is theoretically possible)  They have both MAF and MAP sensors which are both used for engine control.

Hardware and Software for Tuning

• TunerCat RRTuner OBD2
• TunerCat WinFlash software

The only package capable of tuning these vehicles available from Moates is the TunerCat OBD2 tuner suite with WinFlash and cable.  This package is NOT a complete tuning solution as there is NO DATALOGGING!!!  You will need a 3rd party logging tool, such as EFI Live Scan or a GM Tech2 scan tool, to have a workable tuning solution.  This is *NOT* recommended as a first purchase – it is difficult to use compared to other tools and is aimed at an experienced tuner.

Alternatives / Discussion

It will cost about $900 to get into the TunerCat OBD2 package.  There are worthwhile alternatives:

• Convert to a 94-95 ECM that is well-supported by TunerCATS OBD1.  This will require an ALDU1+CABL2 combo, TunerCATS OBD1 tuner ($69.95) with a single definition file ($EE – $19.95) **OR** TunerCats WinFLash and TunerPro RT with the $EE definition, along with a new 94-95 ECM.  This may involve minor wiring changes.  Arguably the most simple and straightforward option.  Preserves all engine sensors, distributor, etc.  This option will work for LTx engines ONLY.  96-97 Vortecs must use another option.
• Convert to a 98+ ECM that is well-supported by EFI Live.  This will involve more substantial wiring changes and a supported 98+ ECM.  This will involve a 24x reluctor conversion kit. (See here for more information.)  This is *NOT EASY OR SIMPLE* but arguably provides the best solution because quality, trusted LSx electronics replace many problematic parts on the earlier engines such as replacing  the Optispark system with coil-near-plug as found on the LSx.

The 94-95 F and Y bodies are a dramatically different breed of PCM compared to earlier models used by GM.  They are primarily tuned by reflash using the ALDL protocol over the diagnostic port, NOT by programming and replacing chips.  (Although this is possible – they feature two 28F512 PLCC EPROMs)  They speak ALDL for datalogging at 8192 baud.  They are MAP sensor based.

BEWARE: these vehicles came with both the rectangular OBD1 style ALDL connectors AND the D-shaped “OBD2” connector, depending on their build date.  Make sure you check to see which connector your car has before ordering.  ( pictures )

BEWARE: these ECUs are notorious for “bricking,” or being killed by a bad flash program.  Please ensure that there is adequate battery voltage at all times.  It is a good idea to put a charger on the vehicle while programming as a drop in voltage for one second (fan kicking on, headlights, turn signals, subwoofer, etc.) can be enough to kill the ECM.  We do NOT rebuild bricked ECUs!

Hardware for Tuning

• ALDU1 with CABL1 or CABL2 depending on build date to reprogram ECM and log data
• APU1 AutoPROM with CABL1 or CABL2 All-in-one device works in pass through mode.  Advanced features of the APU1 including emulation and wideband datalogging are not trivially possible on this platform.
• It is a good idea to use a 12V battery charger, available elsewhere.

Software for Tuning

These computers use the $EE mask.

TunerPro RT + the $EE definitions works for editing bins and datalogging.  TunerPro can log data.  TunerPro can edit bins.  TunerPro CANNOT read or flash ECMs.

TunerCat OBD1 Tuner with the $EE Definition works for editing bins.  TunerCat OBD1 Tuner can read and flash ECMs and edit bins but not log data.

TunerCat DataCat (Formerly TTS Datamaster) works for logging data but cannot read, flash or edit.

TunerCat WinFlash can be used for the actual work of flashing and reading ECMs but will not log or edit.

Madtuner.com offer an alternative flash program which can be used for the actual work of flashing and reading ECMs but will not log or edit.

There is also another $EE hack site that provides improved XDFs to work with TunerPro.

So… There is NOT a single software package that does everything you need.  There are choices and you will need a combination of software packages to be able to read, program, edit and log.

The 86 throttle body injection (TBI) system was the beginning of GM’s transition from carburetors to fuel injection.  This is the first of the “classic” speed-density computers which featured a MAP sensor for airflow metering.  This fundamental airflow model was used largely unaltered in later designs.  P3 generation ECM, 160 baud ALDL communication, 24 pin chip module with 27C32 UV-Erase EPROM.

This ECM was used into the mid-90s in manual transmission equipped vehicles.  It was replaced with newer hardware when the 4l60e and 4L80e electronically-controlled transmissions were introduced.

Hardware Required for Tuning

• G2 Chip adapter and C2 27SF512 chip required to reprogram ECM.
• WARNING: This is NOT plug and play!  Desoldering factory chip is required and soldering install for G2 adapter.  (view install)  Order the “Install Service” and send us your ECM if you’re not comfortable with soldering work.
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 and SocketBooster 1.0 required for real time tuning
• APU1 AutoPROM All-in-one device works great, taking the place of BURN2, ALDU1+CABL1 and Ostrich2
• APU1 works great for the application and is the recommended hardware in addition to the G2.

Software Required for Tuning

These computers use the $42 mask from the factory.

TunerPro RT + the $42 definitions works for editing and datalogging.  (this is the recommended software.  It is included with the AutoProm)

TunerCat OBD1 tuner with the $42 definition works for editing.

WinALDL works for datalogging.

The 91-93 Syclone trucks and Typhoon SUVs were a unique low-production vehicle that featured a powerful turbocharged 4.3L V6 engine.  They use the 1227749 ECM, which is most similar to the 1227730 used in the 90-92 TPI V8s.  These vehicles were equipped with a 2 bar MAP sensor from the factory along with hardware for controlling an intercooler pump and boost control solenoid.  There is no transmission shift control on these ECMs.  8192 baud datalogging, P4 generation ECM with memcal.

Hardware for Tuning

• G1 Chip adapter and C2 27SF512 chip required to reprogram ECM
• G3 Chip adapter, C3 29F040 chip and Ex remote for multi-position chip for multiple tunes
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 required for real time tuning
• APU1 AutoPROM All-in-one device has complications with datalogging.  The APU1 is NOT recommended for the 1227749 ECM!!!  The combination of Ostrich, ALDU1+CABL1 and BURN2 is recommended.

Software for Tuning

These computers use the $58 mask supporting 2 Bar MAP sensors from the factory.  Numerous modifications were available to enable the use of a 3 bar MAP sensor including the “Ultimate Chip” and Code59.

TunerPro RT + the $58 or Code59 definitions works for editing and datalogging.  (this is the recommended software.)

TunerCat OBD1 tuner with the $58 definition works for editing.

TTS Datamaster with the $58 definition works for datalogging.

Custom ROMs may package their own definitions and require specific software support.

Recommended Purchase

G1 + C2 + BURN2 + Ostrich2 + ALDU1 w/CABL1 + Innovate MTX-L + TunerPro RT

The 86-89 F and Y bodies were among the first EFI computers used by GM that featured a Mass Air Flow sensor (MAF) for air metering.  P4 generation ECM, 160 or 8192 baud ALDL communication (depends on code mask), “memcal” with 27C128 EPROM.  Many of these ECMs feature a cold-start injector.  They can drive up to 8 injectors and a single coil with distributor.  There is no transmission shift control on these ECMs. The 1227165 and 16198259 ECMs can be used interchangeably.

Hardware for Tuning

• G1 Chip adapter and C2 27SF512 chip required to reprogram ECM
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 required for real time tuning
• APU1 AutoPROM All-in-one device programs chips, logs data and allows realtime tuning

Software for Tuning

These computers use different masks depending on the application.  $32, $32B and $6E are the most common masks.

TunerPro RT + the $32, $32B and $6E definitions works for editing and datalogging. (included with APU1)

TunerCat OBD1 tuner with the $32, $32B and $6E definitions works for editing. (we do not sell, available elsewhere)

TTS Datamaster with the $32, $32B and $6E  definitions works for datalogging. (we do not sell, available elsewhere)

Logging a Wideband Without an APU1

One of our customers, Fred, was kind enough to email us with this information.  There is a modified bin available to allow logging a wideband with just an ALDU1 instead of requiring the analog inputs on the APU1.  This uses the MAT input to the ECM.  You can read more on thirdgen.org (and a thread on code patches to log 0-5V inputs)

Recommended Purchase

G1 + C2 + APU1 + Wideband

Platform Notes

While $32, $32B and $6E masks are found on these ECMs, it is highly recommended to start tuning with the $6E mask regardless of which mask the ECM/memcal originally used.  Using a chip with the $6E mask will override whatever was present from the factory.  The $6E mask does not use the 9th cold start injector and most importantly, speaks at “high speed” 8192 baud for logging, which is a HUGE improvement over the 160 baud logging used by the $32/32B masks.  Stock bins for various engines (305, 350, etc.) are available for download at the Gearhead-efi $6E information page.

One of the common things that comes up is the idle change with logging on $6E.  It is hard-coded but can be poked with, just like anything.  This thread on thirdgen.org explains what you can do.

The 90-92 Firebird and Camaro were the first of the P4 generation computers which featured a MAP sensor and speed-density for airflow metering.  These fundamental airflow models were used largely unaltered in later designs.  P4 generation ECM, 8192 baud ALDL communication, “memcal” with 27C256 EPROM.

Hardware Required for Tuning

• G1 Chip adapter and C2 27SF512 chip required to reprogram ECM
• BURN2 Chip Programmer programs 27SF512 chips
• ALDU1 with CABL1 required for datalogging
• Ostrich2 required for real time tuning
• APU1 AutoPROM All-in-one device works great, taking the place of BURN2, ALDU1+CABL1 and Ostrich2

Software Required for Tuning

These computers use the $8D mask from the factory.  There is a “Super $8D” mod that adds extra features beyond the stock $8D code.  It is also possible (and recommended) to run Code59 on the 1227730 for forced-induction applications.

TunerPro RT + the $8D, Super$8D or Code59 definitions works for editing and datalogging.  (this is the recommended software.  It is included with the AutoProm)

TunerCat OBD1 tuner with the $8D definition works for editing.

TTS Datamaster with the $8D definition works for datalogging.

Recommended Purchases

Do it all: APU1 + G1 + a wideband ( LC1 MZTX-L LM2 single channel)

Just burn chips/reprogram: BURN2 + G1 + C2

Just log: ALDU1+CABL1