H57 - Check For HO2S Signal Shorted to Power

Diagnostic Trouble Codes (DTCs) 1132 and 1152 and/or 1130 and 1150 indicate HO2S always rich.

- Moisture inside the HO2S harness connector resulting in a short to power.
- HO2S circuit shorted to power.

- Key Off.

- Disconnect the suspect HO2S from vehicle harness.

- Inspect both ends of the connector for damaged or pushed out pins, moisture, corrosion, loose wires, etc. and service as necessary.

- Key On, Engine Off.

- Measure the voltage between HO2S circuit and PWR GND at the HO2S harness connector. Refer to schematic. Pinpoint Test Schematic

- Is the voltage less than 0.5 volts?

YES -- Go to H59. H59 - Check HO2S For Short to Ignition Run Circuit

NO -- An over voltage condition exists on the HO2S circuit. Go to H58. H58 - Check For Short to Power