H85 - Check HO2S Harness Circuit For Short to VPWR and Ground

- Key Off.

- Breakout box installed, PCM disconnected. Inspect both ends of connector for damaged or pushed out pins, moisture, corrosion, loose pins, etc. and service.

- HO2S disconnected.

- Measure the resistance between HO2S Signal Test Pin and SIG RTN Test Pin at the breakout box.

- Measure the resistance between HO2S Signal Test Pin and VPWR Test Pin at the breakout box.

HO2S-12 SIG = Test Pin 35
H02S-22 SIG = Test Pin 61
HO2S SIG RTN = Test Pin 91
PWR GND = Test Pins 24, 76 and 103
VPWR = Test Pins 71 and 97

- Is resistance greater than 10,000 ohms?

YES -- GO to H86. H86 - Check Continuity of HO2S and HO2S Ground Circuits

NO -- SERVICE short in harness. COMPLETE PCM reset to clear DTCs. Clearing Diagnostic Trouble Codes

COMPLETE a HO2S Monitor Drive Cycle. Monitors, Trips, Drive Cycles and Readiness Codes