Condition for fault identification

Test condition:

The fault is recognized when an electrical malfunction is present in the oxygen sensor behind the catalytic converter.

Potential problem source(s):

• Defective wiring harness
• Oxygen sensor behind catalytic converter defective
• Defective DME

Terminal condition: none

Voltage condition:

• Onboard electrical system voltage between 9 V and 16 V

Temperature condition:

• Engine warmed to normal temperature, more than 80°C
• Exhaust-gas temperature at post-catalyst oxygen sensor for detection of signal interruption: 600..800 °C

Time condition:

• Active heating activation more than 1 min.

Other conditions:

• Engine ON