H52 - Check HO2S Ability to Generate Voltage Greater Than 0.5 V

Any vacuum or air leaks in non-EEC areas could cause DTCs 1131, 1151, 1130 and 1150.

Possible Causes:
- Leaking vacuum actuators.
- Engine sealing.
- EGR system.
- PCV system.
- Unmetered air leaks between throttle body and Mass Air Flow (MAF).
- Silicon contaminated HO2S.

- Key Off.

- Disconnect the suspect HO2S from vehicle harness.

- Connect DVOM to the HO2S Signal and HO2S SIG RTN or HO2S GND at the HO2S connector.

- DVOM on 20 volt scale.

- Run engine at 2000 rpm for two minutes.

- Rerun KOER Self-Test and monitor HO2S voltage.

- Does DVOM indicate greater than 0.5 volt at the end of Self-Test?

YES -- Go to H53. H53 - Check Continuity of HO2S and HO2S Ground Circuits

NO -- REPLACE HO2S. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes