i have a 2002 z-28. i have a diablo-sport predator tune in the car right now. my car had a code for a knock sensor. i replaced the knock sensor and cleared the code. after that the tuner and the car would not work together. i cant change anything about the tune. nothing will upload. i called diablo-sport and they said take it to a dealer and have them re-set the computer back to stock settings, get a receipt, and send it back to us and well re-set it for you. the dealer said the computer is locked and they cant do anything with it. do i need a new computer? right now the performance tune is in it and everything seems to be ok, but later on i am going to be getting a dyno tune. i have already bought another computer and it has the same numbers on it. any help would be appreciated. thanks.

 

I am suprised the dealer could not help you. We can help you out. If you just want it set back to stock, we can do it for $50 bucks shipped to your door.

 

Then you need to talk to the Hand-Held Programmer company, again.

The only way the PCM could have locked, the way I read it, is after using the HHP?

Try a BCM re-set first.

 

the same thing has happened to me twice now minus the hand held tuner. Both times two shops and 2 different dealers could not read/connect to my car with tech 2, hp tuners, or ls1 edit... im currently chasing down the problem also

 

what is a bcm re-set? the dealers that i went to said they couldnt do anything to it. i think right before i am ready for a dyno tune ill put the new computer in, have a dealer re-set to stock and my vin, and just say the hell with the diablosport. i dont think the tunes are that good anyway. anyone else?

 

ss4luck, would you let me know if you find out the problem and ill do the same. thanks.

 

be careful with this one i just went through my second PCM cuz i didnt find the problem with the first one

 

well i was lookin through my shop manual with the tech at the race shop today and we've figured there is no communication between the red and blue board.... eerr at least thats in his terms.

Im assuming it means there are to PCM boards that arent in sync. which is pry why my PCM thought it had 2400 miles on it when the car should have 65000... blah a weekend of wiring diagrams here i come

 

Try this procedure,

It was originally "written" for the Holden cars so ignore VX,VU etc and also the actual fuse numbers will not be compatable I would think:-

BCM RESET

1: REMOVE THE FUSE FROM UNDER THE (DASH DRIVERS SIDE) ENGINE CONTROL BCM FUSE #14 (10AMP FUSE)

2: TURN THE KEY TO THE POSITION JUST BEFORE THE "ACCESSORIES."

3: AN ERROR MESSAGE ON THE DASH WILL LIGHT UP AFTER ABOUT 10 SECONDS

4: TURN THE OFF KEY & REMOVE.

5: REPLACE FUSE

6: RESTART ENGINE & TAKE FOR A QUICK DRIVE.

BEWARE NOT TO START THE ENGINE WITH THE BCM FUSE OUT.

DISCONNECTING THE BATTERY WILL NOT RESET THE BCM BECAUSE YOU NEED TO DISCHARGE THE CAPS.

================================================== =====

PCM Reset
Revised on the 26/01/2002

PCM reset Proceduce

Motor at operating temperature a MUST

1.Turn ignition ON

2. Model VT Remove PCM/BCM fuse number 4 which is F31
Note: for VX,VU ,V2 remove fuse F29 10amp Eng Cont/BCM

3.Wait 20 seconds for the Car to chime to you.

4. Turn ignition OFF.

5.Model VT Replace PCM/BCM fuse 4 which is F31
Note: for VX,VU ,V2 remove fuse F29 10amp Eng Cont/BCM

6. Go to the Idle Learn Procedure.

CLEARING THE DTCS

To clear a current diagnostic trouble code from the memory of the PCM, the PCM power feed must be disconnected
for at least ten (20) seconds, or the Tech 2 scan tool must be used. The battery power feed can be disconnected
by:
• Disconnecting the negative battery terminal
• Removing the Fuse F31 in the engine compartment fuse/relay panel.


CLEARING THE DTC HISTORY CODE
The Tech 2 scan tool is the only tool capable of clearing the DTC history code. Disconnecting the battery will not
erase DTC history. The Tech 2 scan tool sends a special message to the PCM to erase the DTCs.

IGNITION CYCLE DEFAULT
If the ignition is cycled (OFF and ON) 50 times without a particular fault resetting, that DTC will be cleared from the
PCM memory and the ignition cycle counter in the PCM will reset to zero. This is another way to clear any code, but not all, but might help you out.



Then follow the idle learn procedures

Idle Learn Procedure

Anytime the power-train control module (PCM) or the battery is disconnected, the PCM loses power.
by removing F31, or the PCM is reprogrammed, the PCM's learned idle position is lost.

Perform the following procedure in order to return the learned idle to the correct position:-

Automatic Transmission

1. Turn OFF the ignition.
2.Restore the PCM battery feed if removed, or replace fuse 4 which is F31.
3.Turn OFF the A/C controls.
4. Set the parking brake and block the drive wheels.
5.Start the engine.
6.Ensure that the engine coolant temperature is more than 80 Degrees.( Check in Mode Up button).
7.Shift the transmission into Drive.
8.Allow the engine to idle for 5 minutes.
9.Shift the transmission into Park.
10.Allow the engine to idle for 5 minutes.
11.Turn OFF the engine for 30 seconds.

Manual Transmission

1.Turn OFF the ignition
2.Restore the PCM battery feed if removed, or replace Fuse 4 which is F31.
3.Turn OFF the A/C controls.
4.Set the parking brake and block the drive wheels.
5.Place the transmission in Neutral.
6.Start the engine.
7.Ensure that the engine coolant temperature is more than 80 Degrees.( Check in Mode Up button).
8.Allow the engine to idle for 5 minutes.
9.Turn OFF the engine for 30 seconds.

 

thank-you i will do the bcm reset. but i cant drive it because the roads are still a little dirty/salty up here in ny.

 

i tried to do the bcm re-set like posted above but there is no engine control bcm fuse in the dash fuse panel or under the hood or anything that is like that that i could see. does anyone know how to do a bcm re-set for a 2002 z-28 6-speed? thanks.

 

Fuse Block--I/P Fuse Application Fuse
Rating
Description

1 - STOP/HAZARD
20A
Hazard flasher module
Stop lamp switch

2 - TURN B/U
20A
Backup lamp switch
Daytime running lamps (DRL) control module
Park/Neutral position (PNP) switch
Turn signal flasher module

3 - STG WHL CNTRL
1A
Steering wheel controls

4 - RADIO ACCY
25A
Audio amplifier
Radio power antenna
Remote playback device - CD player

5 - TAIL LPS
20A
Daytime running lamps (DRL) control module
Headlamp switch

6 - HVAC
20A
HVAC control assembly

7 - PWR ACCY
15A
Instrument panel cluster (IPC)
Outside rearview mirror switch
Radio
Rear compartment lid release relay
Theft deterrent relay
Shock sensor

8 - COURTESY
20A
Body control module (BCM)

9 - GAUGES
10A
Body control module (BCM)
Daytime running lamps (DRL) control module
Second gear start switch(V6 VIN K) (Chevrolet w/o NW9)
Traction control switch
Instrument panel cluster (IPC)
Stop lamp switch

10 - AIR BAG
15A
Inflatable restraint sensing and diagnostic module (SDM)

11 - CIGAR/ACCY
25A
Accessory power outlet
Cigar lighter
Data link connector (DLC)

12 - DEFOG/SEATS
30A
Seat assembly - driver
HVAC control assembly
Seat assembly - passenger

13 - STG WHL CNTRL
1A
Steering wheel controls

14 - WIPER/WASH
25A
Windshield wiper motor
Windshield wiper/washer switch

15 - WINDOWS
30A
Folding top relay (with ETA)
Folding top switch
Window control module
Fog lamp relay - rear (Export)
Window switch - driver
Window switch - front passenger

16 - IP DIMMER
5A
Ashtray lamp
Courtesy lamp - left door
Courtesy lamp - Right door
Fog lamp switch
Folding top switch
Headlamp switch
HVAC control assembly
Instrument panel cluster (IPC)
PRNDL lamp
Radio
Fog lamp switch - rear (Export)
Second gear start switch
Traction control switch

17 - RADIO
15A
Body control module (BCM)
Radio

 

thanks for the info now i just need to know which fuse exactly and the exact steps.