Work step 9: Catalyst diagnosis

WARNING: This page is about a different car, the 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, and 2000 Volkswagen Cabrio. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The diagnosis will only be terminated if the Oxygen sensor aging diagnosis is first successfully completed.

Indicated on display

Fig 1: Scan Tool Display - Work Step 9: Catalyst Diagnosis (Basic Setting)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press keys 0, 4 and 6 for "Display group number 46" and confirm entry with Q key.

Indicated on display: (1 to 4 Display zones)

Fig 2: Scan Tool Display - Work Step 9: Catalyst Diagnosis (System In Basic Setting 46)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Increase engine speed at 2800 to 3200 RPM until display in display zone 4 jumps from:
"Test OFF" to "Test ON"
The catalytic converter temperature in display zone 2 must be:
min. 352° C.
Check amplitude ratio in display zone 3:
Specification: max. 0.55
Continue to maintain speed at 2800 to 3200 RPM until specification:
"Cat B1 OK"

appears in display zone 4.

NOTE: The diagnosis of the catalytic converter takes approx. 100 seconds. If there is still no result in the display after 150 seconds, change the speed within the tolerance.

Remove engine speed adjuster VAG 1788/10 from accelerator pedal.
Press --> key.
Press keys 0 and 6 for "End Output" function and confirm input with Q key.

If the display does not indicate as described:

Check DTC Memory. See Diagnostic Trouble Code (DTC) memory .

If the display indicates as described:

Press --> key.
Display readiness code. See READINESS CODE, DISPLAYING .