Display group 37 -oxygen sensor control- dwell time test
WARNING: This page is about a different car, the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 2000 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.
Readiness code
| Display group 37 -oxygen sensor control- dwell time test | ||||||
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| Read Measuring Value Block 37 | → | ← Indicated on display: | ||||
| xxx % | x.xxx V | xxxx ms | Text | |||
| 1 | 2 | 3 | 4 | ← Display fields | Specified value | Evaluation |
| Result (Test ON / Test OFF / sys. OK / not OK) | Sys. OK | |||||
| Dwell time of oxygen sensor regulator before catalytic converter | -1200 to 1200 ms | |||||
| Sensor voltage of oxygen sensor behind catalytic converter: | 0.100 to 0.900 V | Refer to Evaluation display group 36, display field 1 - sensor voltage of oxygen sensor behind catalytic converter | ||||
| Engine load | 12 - 30% | --- | ||||
Note for display field 3:
Oxygen sensor control behind catalytic converter is superior to oxygen sensor control before catalytic converter and is responsible for control correction. It corrects slight changes in the mixture (i.e. toward rich or lean) due to the oxygen sensor before catalytic converter by holding oxygen sensor control before catalytic converter at its higher or lower point for a specific time -t- (dwell time). If this time is in the positive range (i.e. 50 ms), mixture is shifted in the -enrich- direction. If this time is in the negative range (i.e. -50 ms), mixture is shifted in the -lean- direction.
If value climbs to above 200 ms, this indicates a leaking exhaust system.