Display Group 041

Voltage signal of oxygen sensors in front of and behind three way catalytic converter

Notes on display field 3 and 4:
- The voltage signals of bank 1 heated oxygen sensor 2 and/or bank 2 heated oxygen sensor 2 should not be evaluated until at least 50 sec. after the oxygen sensor heating is switched on display group 040.
- With cold engine and ignition on, a voltage signal of 0.400 volts is displayed in all four display fields. With very hot engine and ignition on, a signal of 0.000 volts is displayed in display field 3 and.
- The voltage signal of the heated oxygen sensors behind the three way catalytic converter must lie between about 0.5 volts and 0.6 volts with a three way catalytic converter with sufficient effect (conversion). During deceleration fuel shut off, the voltage signal must be less than 0.1 volts constantly. During operation with wide open throttle enrichment, the voltage signal must be greater than 0.6 volts.
- If there is wide open throttle (signal voltage during wide open throttle enrichment greater than 0.6 volts) with a new three way catalytic converter, distance driven less than 5,000km (3,000 mi.) after a preceding deceleration fuel shut off (signal voltage less than 0.1 volts), the transition from low to high voltage can be delayed up to 10 seconds. If acceleration is uniform after a preceding deceleration fuel shut off, the transition from low to high voltage is delayed up to 3 minutes.