Work step 8: Oxygen sensor aging diagnosis (cycle duration monitor)

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.

Indicated on display

Fig 1: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (Rapid Data Transfer)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press keys 0 and 8 for "Initiate basic setting" function and confirm entry with Q key.

Indicated on display

Fig 2: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (Rear Measuring Value Block)

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Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.

Indicated on display: (1 to 4 = Display zones)

Fig 3: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (Rear Measuring Value Block 34)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Set an engine speed of 2200 to 2800 RPM with speed regulator VAG 1788/10.
Maintain speed at 2200 to 2800 RPM until catalytic converter temperature in display zone 2 exceeds:

352° C.

NOTE: This process can take a few minutes.

Press C key.

Indicated on display:

Fig 4: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (Read Measuring Value Block)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press keys 0, 3 and 0 for "Display group number 30" and confirm entry with Q key.

Indicated on display: (1 to 4 = Display zones)

Fig 5: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (Read Measuring Value Block 30)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Check operating condition of Oxygen sensor control in front of catalytic converter (display zone 1):
Specification: 111
Check operating condition of Oxygen sensor control after catalytic converter (display zone 2):
Specification: 111

NOTE: The Bits in display zone 2 are set to 1 first when the catalytic converter temperature exceeds 352° C (--> display group 34, display zone 2).

Significance of 3 digit number block in display zones 1 and 2:

3 DIGIT NUMBER BLOCK SIGNIFICANCE IN DISPLAY ZONES 1 AND 2 (OXYGEN SENSOR AGING DIAGNOSIS)

Significance if display = 1
1	2	3
		1	Oxygen sensor control active
	1		Oxygen sensor operationally ready
1			Oxygen sensor heating on

If the specifications are not obtained:

Check DTC Memory. See Diagnostic Trouble Code (DTC) memory .
If the specifications are obtained:
Set an engine speed of 2200 to 2800 RPM with speed regulator VAG 1788/10:
Press --> key.

Indicated on display

Fig 6: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (Rapid Data Transfer)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press keys 0 and 4 for "Initiate basic setting" function and confirm entry with Q key.

Indicated on display:

Fig 7: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (Basic Setting)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.

Indicated on display: (1 to 4 - Display zones)

Fig 8: Scan Tool Display - Work Step 8: Oxygen Sensor Aging Diagnosis (Cycle Duration Monitor) (System In Basic Setting 34)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Maintain engine speed at 2200 to 2800 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 time period in display zone 3:
Specification: max. 2.2 seconds
Continue to maintain speed at 2200 to 2800 RPM until specification
"B1-P1 OK"

appears in display zone 4.

If the specifications are not attained:

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

If the specification is obtained:

Press C key.