C5Sweden

Hello

I have a 1999 Corvette C5, A4 (European model).

I am fairly new to tuning and got an e-mail baseline tune for my 427cui project, HP-tuner.

However the file is from another vehicle (newer) and after loading it into my car (Write entire) I can not get the car idling, it ignites, 1 - 2 seconds and stalls immediately and the code P1631 appears.

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Checked P1631 (theft deterrent password incorrect) and got the following:

This diagnostic tests for mismatched passwords between the PCM and BCM. Whenever replacing the BCM or PCMfollow the theft learn procedure in order for the system to learn the new password.

Conditions

Mismatched password metween PCM and BCM

Conditions for setting the DTC

- The PCM detects a wrong password from the BCM
- The fuel disable lockout is set
- The system has recieved an incorrect fuel continue password
- An invalid ignition key or malfunctioning ignition switch
- The BCM was replaced.

Action taken when DTC sets:

- The engine starts and then the engine stalls immediately
- The PCM stores the DTC information into the memory when the diagnostic runs and fails
- The malfunction indicator lamp will not illuminate
- The PCM records the operating conditions at the time during which the diagnostic fails. The PCM stores this information in the Failure records.

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After checking the VCM Editor I have followed the following procedure at least 10 times:

Relink VATS

This feature allows the VCM to relink with the vehicles security system. It is only required on vehicle fitted with Serial VATS systems. It can be used when a new PCM is used in a vehicle or after reflashing a new operating system into a PCM from a different vehicle.

Procedure
To relink the VCM with the BCM please use the following steps:

Plug the interface cable into the vehicle OBD2 port and PC serial/USB interface. See Connecting to the Vehicle section for more information.
Open VCM Editor and select "Relink VATS" from the "Flash" menu. The Relink VATS form will appear.
Put the key in the ignition and turn to the ON position (do not start the vehicle).
Wait 10 to 15 seconds.
Press the Commit button when ready.
Wait for the procedure to complete.
Turn Ignition off for 30 seconds.
Turn Ignition on for 30 seconds.
Turn Ignition off for 30 seconds.
Turn Ignition on for 30 seconds.
The vehicle has now relinked the VCM to the BCM.

Relink VATS Rules
The following checks are in place when using the Relink VATS function:

You can relink VATS on vehicles with serial VATS system.
You can relink VATS on any vehicle supported by HP Tuners.
You do not need an individual license for the vehicle.

Have also calibrated the key by holding the lock and unlock button at the same time until the horn honks.

BUT CAN NOT GET RID OF THE p1631 dtc, every time I am supposed to start it stalls immediately and I get p1631, WHAT TO DO?

How can I get the PCM and BCM to link in an European sold vehicle?

Thanx in advance

Tommy

BlackZ06

Try the following 30 minute re-learn procedure ....

1) Turn ON the ignition with the engine OFF

2) Attempt to start the engine, then release the key to ON (vehicle will not start)

3) Observe the SECURITY warning lamp, after approximately 10 minutes it will turn OFF

4) Turn OFF the ignition, and wait 5 seconds

5) Repeat steps 1 through 4two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the password on the next ignition switch transition from OFF to CRANK).

IMPORTANT: The vehicle learns the password on the next ignition transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

6) Start the engine (the vehicle has now learned the password)

7) Clear any DTC if needed

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Finis

C5Sweden

Thanx

Have seen this procedure as well but before the description it says:

IMPORTANT

This procedure is for United States and Canada vehicles only!

BlackZ06

My Service Manual is supposedly for all versions of the car (electrical diagrams, for example, show Euro, Japanese, and other differences in electrical systems.).

My manual does not indicate this procedure is unique to North American cars ...

Try it, it might work, other than that, I have no idea what else you can do, other than take it to someone who has a Tech2 where they probably will do the "10 Minute Learn Procedure" .... because a Tech2 is required to shorten the time.

BlackZ06

One other thought ... could that procedure you are following have been mis-translated or mis-understood ... is it possible it should be 10 MINUTES instead of 10 SECONDS between each iteration ??

C5Sweden

Thanx for your assistance and ideas, will try and see...

Best Regards

Tommy