Oxygen Sensor - Offset Voltage Change
Group: SPECIAL SERVICE TOOLSNumber: 98-09-006
Date: JUNE, 1998
Model
1997-98 TIBURON
1996-98 ACCENT & ELANTRA
Subject
1998 OXYGEN SENSOR OFFSET VOLTAGE CHANGE
DESCRIPTION:
The oxygen sensor voltage offset (or bias voltage) observed when using the Hyundai Diagnostic System (HDS) has changed on 1998 Accent, Elantra & Tiburon from the value of previous model years. The oxygen sensor voltage offset is 0.27 volts for 1998 Elantra and Tiburon, and 0.30 volts for 1998 Accent.
When the HDS is used to monitor oxygen sensor signals on 1996 and 1997 Accent & Elantra and 1997 Tiburon vehicles, a 0.70 V (0.71 V for Tiburon) signal offset is observed, This shifts the sensor readings 0.70 V (0.71 V for Tiburon) higher so the new signal range is 0.70 V to 1.70 V (0.71 V to 1.71 V for Tiburon). This shift is seen only when using the HDS machine because the sensor signal is read before it is processed (filtered) by the powertrain control module (PCM) (this offset is not present when using the Scan Tool). The offset has no affect on the sensor signal appearance or frequency.