Engine Control Module (ECM), procedure after replacing: Requirements

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, 2000 Volkswagen Cabrio, 1999 Volkswagen Jetta, and 1999 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.

Authorized key available.

Insert old (authorized) key into ignition lock.
Connect VAG1551 Scan Tool (ST), switch on ignition, select operating mode 1 "Rapid data transfer" and enter address word 25 for "immobilizer".

After control module identification is displayed:

Press --> button.

Indicated on display:

Fig 1: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (1 Of 10)

G03364151

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Press button -1- twice. This selects the "Login procedure" function 11.

Indicated on display:

Fig 2: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (2 Of 10)

G03364152

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Press -Q- button to confirm input.

Indicated on display:

Fig 3: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (3 Of 10)

G03364153

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Input the secret number, place a -0- before the 4 digit number (e.g. 01915).
Press -Q- button to confirm input.

Indicated on display:

Fig 4: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (4 Of 10)

G03364154

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NOTE: If indicated briefly on display:

Fig 5: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (5 Of 10)

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Secret number is not being accepted. Repeat input.
3 attempts at entering the secret number correctly are possible immediately. The next 3 attempts are not emitted for at least 10 minutes. During this time, the ignition must remain constantly switched on. On Board Diagnostic (OBD) must be also exited using the "End Output" function 06.
The wait period between each of the next 3 attempts doubles up to the maximum time of 255 minutes.

Press buttons -1- and -0- to select "Adaptation", function 10.

Indicated on display:

Fig 6: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (6 Of 10)

G03364156

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Press -Q- button to confirm input.

Indicated on display:

Fig 7: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (7 Of 10)

G03364157

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press -0- button twice to select "channel 0".
Press -Q- button to confirm input.

Indicated on display:

Fig 8: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (8 Of 10)

G03364158

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press -Q- button to confirm input.

Indicated on display:

Fig 9: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (9 Of 10)

G03364159

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press --> button.

Indicated on display:

Fig 10: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999 - Engine Control Module) (10 Of 10)

G03364160

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE: When ignition is switched on for the next time, the identification key of the Engine Control Module (ECM) will be read by the control module for immobilizer and stored. Engine must not be started again for approximately two minutes.