HO2S 1 CIRCUIT LOW VOLTAGE
PCM provides about 0.35 volt reference to HO2S 1. HO2S 1
sensor signal voltage varies from about one volt when exhaust is rich
to about 0.1 volt when exhaust is lean. PCM reads and stores sensor
voltage information and evaluates the voltage samples to determine
amount of time sensor voltage is out of range. If HO2S 1 voltage is
out of predetermined range, DTC will set.
There may be no visible symptoms to the driver, other than the MIL (Service Engine Soon).
- Faulty o2 oxygen sensor
- Short to voltage on O2 signal circuit
- High resistance or open on O2 signal circuit