11. HO2 Sensor, Bank 1, Sensor 2 (Behind TWC)
Ensure that parking brake is set and transmission is in park (A/T) or neutral (M/T). Allow engine to run at
idle. Press keys "2", "1" and "9" for display group 219 and enter by pressing "Q" key. Observe display
field 3, TWC temperature should be between 392°F (200°C) and 1112°F (600°C). Observe display field
4. Depress brake pedal, keep brake pedal depressed and accelerate engine to wide open throttle, ECM will
increase RPM to approximately 2300 RPM. Continue to run engine at 2300 RPM (approximately 50
seconds) until "X X X X X 1 0 0" appears in display field 4. If "X X X X X 1 0 0" is displayed, press "C"
key and check next component. If "X X X X X 1 0 0" does not appear in display field 4, press right arrow
key, check for DTC(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION . Repair as
necessary.
12. HO2 Sensor, Bank 1, Sensor 2 (Downstream TWC)
Ensure that parking brake is set and transmission is in park (A/T) or neutral (M/T). Allow engine to run at
idle. Press keys "2", "2" and "1" for display group 221 and enter by pressing "Q" key. Observe display
field 3, TWC temperature should be between 392°F (200°C) and 1112°F (600°C). Observe display field
4. Depress brake pedal, keep brake pedal depressed and accelerate engine to wide open throttle, ECM will
increase RPM to approximately 2300 RPM. Continue to run engine at 2300 RPM (approximately 30
seconds) until "0 0 0 X X 1 0 0" appears in display field 4. If "0 0 0 X X 1 0 0" is displayed, press "C"
key and check next component. If "0 0 0 X X 1 0 0" does not appear in display field 4, press right arrow
key, check for DTC(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION . Repair as
necessary.
13. HO2 Sensor Switching, Bank 1, Sensor 2 (Downstream TWC)
Ensure that parking brake is set and transmission is in park (A/T) or neutral (M/T). Allow engine to run at
idle. Press keys "2", "2" and "4" for display group 224 and enter by pressing "Q" key. Observe display
field 4. Depress brake pedal, keep brake pedal depressed and accelerate engine to wide open throttle,
ECM will increase RPM to approximately 2300 RPM. Continue to run engine at 2300 RPM
(approximately 15 seconds) until "X X X X X 1 0 0" appears in display field 4. If "X X X X X 1 0 0" is
displayed, press "C" key and check next component. If "X X X X X 1 0 0" does not appear in display
field 4, press right arrow key, check for DTC(s). See DIAGNOSTIC TROUBLE CODE
IDENTIFICATION . Repair as necessary.
14. HO2 Sensor Aging (Sensor Dynamics), Bank 1, Sensor 2 (Downstream TWC)
Ensure that parking brake is set and transmission is in park (A/T) or neutral (M/T). Allow engine to run at
idle. Press keys "2", "2" and "6" for display group 226 and enter by pressing "Q" key. Observe display
field 3, TWC temperature should be between 842°F (450°C) and 1364°F (740°C). Observe display field
4. Depress brake pedal, keep brake pedal depressed and accelerate engine to wide open throttle, ECM will
increase RPM to approximately 2300 RPM. Continue to run engine at 2300 RPM until "X X X X X 1 0
0" appears in display field 4. If "X X X X X 1 0 0" is displayed, press "C" key and check next component.
If "X X X X X 1 0 0" does not appear in display field 4, press right arrow key, check for DTC(s). See
DIAGNOSTIC TROUBLE CODE IDENTIFICATION . Repair as necessary.
15. Fuel Trim Diagnostic (Idle)
Ensure that parking brake is set and transmission is in park (A/T) or neutral (M/T). Allow engine to run at
NOTE:
Work Steps 15 through 18 are performed at idle speed.
2003 Volkswagen New Beetle GLS
2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)
Helpmelearn Repair Manuals
Wednesday, December 14, 2005 8:49:53 AM
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