When Monitored

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

With the engine running, before the O2 system enters closed loop operation (Cold test on startup) and during closed loop operation.
- The PCM detects a circuit has fallen outside the allowable range during the Cold test (at startup) or during closed loop operation, a Hot test is initiated. The hot test will be repeated every 20 seconds, as long as the circuit voltage measurements are still out of range. The PCM will run a Cold test, performed at power down (ignition off) to identify the specific circuit with the failure.