Ignition Circuit Monitoring

Ignition circuit monitoring
Misfiring below an engine speed of 3000 rpm is detected by the misfiring detection system. Above 3000 rpm misfiring is detected by the ignition circuit monitoring (self- diagnosis) and prevents damage to catalytic converters.

The secondary circuit monitoring operates with a "shunt" (resistor in secondary ground line).

If, after successful ignition, the threshold voltage for misfiring detection is not reached, a defect code is stored, the fault lamp activated (US models only) and the corresponding row of cylinders deactivated.