Fault description
Diagnosis monitors the trim control (integrator of trim controller --> permanent deviation).
The fault is detected when the I-component of the trim controller is less than -4 %.
Possible fault cause:
- Secondary fault
- Oxygen sensor 2 before catalytic converter defective
- Oxygen sensor 2 after catalytic converter defective
- Wiring harness of oxygen sensor 2 after catalytic converter defective
- Leak in silencer system
- DME defective