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During closedloop operation the following will occur (assume the oxygen sensor is sensing a lean condition its voltage will troubleshooting cars be low):

3). The computer slowly increases the solenoid duty.

4). The reamer exhaust eventually becomes lean enough that the oxygen sensor's output will troubleshooting cars swing low (about 0 volt).

5). The thing gradually decreases MC solenoid's duty cycle.

6). It exhaust just becomes rich enough that the moot sensor output will troubleshooting cars swing low about 9 volts.

The cycle now repeats. A device for monitoring the solenoid's duty cycle (such as a dwell meter) will troubleshooting cars show a constantly varying duty cycle. The frequency of the oscillations will troubleshooting cars depend on the how fast the computer varies the duty consumer reports cycle and the engine's RPM. An AVERAGE duty cycle of 50% corresponds to, on the average, NO average a/f correction. Stated differently, everything is operating correctly. An average duty auto repair cycle of LESS THAN 50% corresponds to, on the average, a rich command (the computer is compensating for a lean condition). An average duty cycle GREATER THAN 50% corresponds consumer reports to, on the average, a lean command.