ECU module programming guide using FDRS

[rugedraw]

Many people have had issues updating vehicles in the UAE. Not sure why it happens. Is FDRS downloading a manifest file into the USB update for the TCU? I'm guessing it is if it gets as far as saying it is updating and not just indexing. Try testing resetting the GWM.

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[dusk1911]

Many people have had issues updating vehicles in the UAE. Not sure why it happens. Is FDRS downloading a manifest file into the USB update for the TCU? I'm guessing it is if it gets as far as saying it is updating and not just indexing. Try testing resetting the GWM.

All other updates went fine, just did the APIM along with DSP and others. It's just this one. Could it be because all the connectivity features are disabled ? Would a PMI work fine for the TCU ?

 

[Demps]

The 'door open' sequence begins the shutdown procedure, if the door is already open it starts anyway. It's not a 'leave the door open', it's a power down the vehicle and at least open the door. It can be an open and shut type of thing, not leave the door open.

If you turn off the truck with the door closed you'll notice accessory / radio is still alive and the second the door is open it starts the power down operation.

@HammaMan @Cobraman428
Just did marathon FDRS upgrade for BlueCruise 1.4. In the many hours it took to do the numerous modules I didn't shut the door or turn on the engine. I used a Clore PL2320 power supply and did Ignition Off Ignition On when instructed to verify the update.

 

[rugedraw]

All other updates went fine, just did the APIM along with DSP and others. It's just this one. Could it be because all the connectivity features are disabled ? Would a PMI work fine for the TCU ?

Sorry, didn't see this. PMI won't hurt to try, just make sure you select no when FDRS asks if it is the original module.

 

[Lead Foot PowerBoost]

Thanks. Looks like ‘21 PB’s have a significantly different strategy for the PCM. The newest one I’ve seen in the last couple of days is -VKK.

Does this mean the '21s will drive differently than all the later model years? I did notice after doing all the updates last weekend that the motor starts and engages more smoothly when accelerating from a stop than it did before. I'm guessing that's due to the PCM update?

 

[Snakebitten]

Does this mean the '21s will drive differently than all the later model years? I did notice after doing all the updates last weekend that the motor starts and engages more smoothly when accelerating from a stop than it did before. I'm guessing that's due to the PCM update?

On these trucks a PCM update is also a wipe/flush/clearing of a bunch of accumulative data that affects drivability. And depending on which drivetrain you have, that wipe will present itself in a noticeable change in driving characteristics as the engine management logic begins to re-accumulate fresh data.

Transmission shifting is often the most noticeable. And on a Powerboost, it should be noticed that EV mode isn't readily available when/where it has been previously. That by itself can make a Powerboost less indecisive from a standing start.

 

[JEB]

Does this mean the '21s will drive differently than all the later model years? I did notice after doing all the updates last weekend that the motor starts and engages more smoothly when accelerating from a stop than it did before. I'm guessing that's due to the PCM update?

No. The strategy itself shouldn’t cause driving differences across model years. What you’re noticing is a byproduct of updating the PCM itself. Whenever you update that particular module, the adaptive tables (learned shift points, etc.) are automatically reset. It will feel smoother as the PCM relearns your shift points based on your driving habits and repopulates the adaptive tables.

Some people periodically take advantage of this relearning process to correct shifting issues without updating the PCM by using FORScan to reset the adaptive tables directly. It’s a service procedure listed under the PCM.

 

[Tankboy25]

Sorry, didn't see this. PMI won't hurt to try, just make sure you select no when FDRS asks if it is the original module.

Should I try this too for my PCM to force an update? Just tell FDRS it is a new module.

 

[Lead Foot PowerBoost]

Transmission shifting is often the most noticeable. And on a Powerboost, it should be noticed that EV mode isn't readily available when/where it has been previously. That by itself can make a Powerboost less indecisive from a standing start.

I did notice that for about 5 minutes into my test drive after making all the updates. It didn't go into electric mode at all and got me very concerned I made a mistake updating everything. But after 5 minutes it started going into electric mode as per usual and I appear to be getting the same or better mpg since. So it's only the smoothness of the transition from electric to hybrid operation from a standing start that has noticeably improved for me. Though I fear it will revert to its old self after it relearns my habits. Not that its old self was terrible - just a little clunky in the transition.

 

[rugedraw]

Should I try this too for my PCM to force an update? Just tell FDRS it is a new module.

It won't hurt to try. Not sure what is going on in your case.

 

[Tankboy25]

It won't hurt to try. Not sure what is going on in your case.

I did the PMI on the PCU yesterday and it worked!

PCM - Powertrain Control Module
Part number: ML3A-12A650-GNC
Calibration level: ML3A-12A650-GNC
Strategy : ML3A-14C204-UZK

 

[JEB]

I did the PMI on the PCU yesterday and it worked!

PCM - Powertrain Control Module
Part number: ML3A-12A650-GNC
Calibration level: ML3A-12A650-GNC
Strategy : ML3A-14C204-UZK

The strategy looks to be the same as it was before the PMI. Double check to make sure you’ve cleared the FORScan cache and you aren’t using an old profile. Otherwise, you might want to do a network rescan in FDRS to make sure you don’t have a newer PCM update available. The most recent version I’ve seen for a ‘21 Powerboost is -VKK.

 

[Tankboy25]

The strategy looks to be the same as it was before the PMI. Double check to make sure you’ve cleared the FORScan cache and you aren’t using an old profile. Otherwise, you might want to do a network rescan in FDRS to make sure you don’t have a newer PCM update available. The most recent version I’ve seen for a ‘21 Powerboost is -VKK.

It is, hmmmmmm. I just verified in FDRS that no update is offered and confirmed the info in FORScan. Guess this is as far as my PCM goes.

 

[JohnTrigger]

Updated my truck with FDRS again this AM. Last time was about beginning of April when I did all available updates at that time. Today had a TRM, PCM and APIM. All 3 updated fine.

For the APIM: SYNC was 24127, Rev 1270. SYNC now is 25094, Rev 1779.

 

[digitaltrucker]

Updated my truck with FDRS again this AM. Last time was about beginning of April when I did all available updates at that time. Today had a TRM, PCM and APIM. All 3 updated fine.

For the APIM: SYNC was 24127, Rev 1270. SYNC now is 25094, Rev 1779.

I have the tools now to do this, just have been very cautious about taking the step to do it.

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