crank relearn??

[2004gmc]

my buddy got a tuned pcm for his 5.3 and he wants me to do a relearn on his but i cant find any info on how to do with the v2?

[joecar]

First warm up engine to operating temp...

then with vehicle parked and engine running at idle:
- connect scantool (click green connect button),
- goto DVT tab,
- select controller,
- click Activate,
- goto Learning subtab,
- click CASE Relearn (see next line),
- open throttle to increase RPM above 4000, you must do this within 10 seconds (see next line),
- when you get the stumble/misfire (it will be quite notcieable) immediately release throttle,
- let engine spindown to idle,
- after reaching idle, turn off engine and wait 20 seconds,
- while waiting 20 seconds, you can click Deactivate.

You may possibly have to have brake applied and/or parking brake applied during this.

Only one CASE relearn can be done per ignition cycle.

[2004gmc]

thanx joecar

[odd boy]

is it applicable for E38 ecu's?

[GAMEOVER]

Yes, same procedure...:D

[Frost]

the parking brake must be set. swaps that don't have it need to have the input set.

[madmax4499]

how? if you dont have a park brake input

[Taz]

The GM manual will instruct you to apply the brakes for the duration of the CKP learn procedure. Generally, this means keeping your foot on the brake pedal.

Your signature indicates an 0411 PCM - not sure what OS you are running - brake input with a truck OS is C1 pin 33.

The PCM receives 12 volts (10 amp circuit) when the brakes are NOT applied - normally closed switch. When the brakes are applied, this circuit opens and the PCM no longer receives power.

If you are not using a brake switch in your vehicle, a simple switch may be wired for the purpose of the CKP learn procedure. Once you have this switch set up check to see if DTC 0719 or 0724 (brake switch related) are in the PCM memory (these will not turn on the MIL). Clear these codes if present.

When warming up the engine prior to the CKP learn procedure make sure there is power going to the PCM brake input. When brake input is required, simply turn off this switch - the CKP learn procedure should then run.


Regards,
Taz

[slows10]

Depending on your o/s, An easy quick way to do this is just ground C1-32 and C1-34. See what you have in these pin locations at the ecm. Either way ground these to pins to a ground on the chassis or engine and run the test procedure. When you are done un ground the wires and it should have completed the relearn.

[Taz]

Depending on your o/s ... just ground C1-32 and C1-34 ...

Depending on the OS, doing the above may send a signal to the PCM indicating that the transmission is in Park / Neutral ... you will still require a brake input.


Regards,
Taz

[slows10]

Right everything depends on os and transmission and brake switch. Different pins need grounding depending on if it is a manual or auto.He is probably thinking parking brake and not the footbrake. He also needs to know what his setup is regarding c1 32 and c1 34

[slows10]

He may be running a manual trans file.

[slows10]

Also we are talking foot brake and not park brake correct? There is no input for the parking brake is there? That is what they were talking about a few posts up

[Taz]

Also we are talking foot brake and not park brake correct? There is no input for the parking brake is there?

Yes sir ... you are correct ... PCM does not monitor the parking brake (emergency brake). PCM does monitor the "foot brake" pedal switch in both auto & manual trans OS, and clutch pedal switch in manual OS.


Regards,
Taz

[madmax4499]

02020003 os, it is a th-400 car, the tune is from a 4l60 car with the trans stuff shut off. the tcc is not hooked up, the P/N wire is grounded.

when i try the case, it tells me "no reply"

[Taz]

02020003 os ....

That is a COS ... what was the original OS the COS is based on ? What year and model vehicle was the original OS from ?

Camaros use a very simple P/N switch ... trucks use a more complex switch. Also, brake pedal switch input pin varies by OS / application.


Regards,
Taz

[slows10]

Your pcm may be looking for a clutch pedal switch

[madmax4499]

12212156 2002 pontiac t/a 5.7 4l60e the harness is from PSI

[Taz]

That OS / vehicle uses a simple P/N switch ... grounding PCM C1 (Blue) pin 34 (orange / black wire) will indicate Park / Neutral to the PCM.

The brake input (12 volt 10 amp circuit - described previously) for that OS is PCM C1 pin 33 (purple wire). The tune was from an A4 - so no clutch switch input is required.

With these PCM inputs properly configured, no relevant DTCs stored in the PCM, the CKP learn routine should run.



Regards,
Taz

[madmax4499]

thank you i will report back.

[Boost]

Just a note, on stock cars the a/c needs to be off and brake pedal held, recently on a silly Aveo I had to rev 3-4 times (that never happened before in years) it works good but I will try soon with my FlashScan since I never have. Good info!

[gareth12]

Sorry to dig up an old thread, Im trying to do this with a vz ss 6.0 e38 ecu thats in a nissan silvia, it doesn't work, i assume because the brake is not hooked to the ECU.

Been struggling to find ECU pinouts to trick the ecu into thinking the brake is on, seem to only be able to find US e38 stuff and i understant the pinouts are different. Can anyone assist?

[Taz]

E38 brake input is J1 (Black) pin 9. This circuit receives 12 volts when the brakes are applied, and is interrupted when the brakes are not applied (opposite logic of the earlier Gen 3 PCMs). You can use a simple switch for the CKP Learn procedure - just make sure you cycle the switch a couple of times prior to mimicking the "brake applied" signal during the relearn.

[gareth12]

Great thanks! Dont supose you have a full pinout i can get hold off? There are a bunch of other things like speedo that i need to get working

[Taz]

If you are looking for a zero cost option - then a Google search will provide many options (just from unknown sources). If you prefer a trusted source - like Alldata or ACDelco - then these charge a nominal fee.

[gareth12]

Cant seem to get the right one on the google searched. All good, thanks

[Tinbender59]

When I select CASE it will not stay selected, is that normal??

[Tinbender59]

Now i get "no reply, try again". What does that mean?

[Tinbender59]

After some research ill prove my wiring, the cab is a 2001, under hood is 1999 wiring,. May have a disconnect somewhere?

[joecar]

Some thing is going wrong... when you click CASE it should pop up telling you to rev engine to 4000+ rpm and to release throttle when engine stumbles...

[Tinbender59]

Ok, I've fixed the neutral safety switch, feed 12 volts to th correct pin for brake feed. Changed tune, still will not let me do crank relearn. What is the scan tool looking for, I'll start there??

[Tinbender59]

How do the guys running a stand alone harness get this done?

[1FastBrick]

Vehicle needs to be within a certain temp range. Must be in Park, and see Foot applied on the brake signal. No DTC's pending.

That's all I can recall at the moment.

[Dcon]

An old thread, but very relevant. Trying to do a crank relearn with no luck. LS1B 2001 Camaro manual tune Operating System 12202088 on a 24x conversion Ramjet 350 . I have both the Brake and clutch switches. C1 32 Normally Closed to ground, C1 33 NC to 12v. Using Ver 8 Scan and Tune, with a V3 device. Thinking about trying Ver 7.5 Scan if that will even work with my V3. It starts, but runs rough. Throwing P0200 injector codes, P0480/P0481 fan codes along with the P1336 CKP relearn code. Clear them before relearn, still nothing. I think ill try grounding C1 34 to fake park/neutral even though it is a manual tune. Any thoughts or suggestions??? Thanks!

[joecar]

I'll have to look at the GM service manual to see all the required conditions.

[Dcon]

I'll have to look at the GM service manual to see all the required conditions.

That would be great. I have tried all I could think of. made sure there were no current faults, foot brake on, clutch in, grounding C1 34 P/N. still no go. I just set it to No MIL for now to deal with later. P0327 KS is kicking my ass now!