Accent L4-1.6L (2003)
F. Select "Custom Data"
G. Select "02-B1 S1" and "02-B1 S2" (front and rear oxygen sensors) and ENG RPM if no tachometer is available.
H. Press "N" and the selected data will appear.
2. While holding the engine speed at 2500 rpm in Neutral or Park (with no load) observe the front and rear oxygen sensors for approximately one
minute. The front oxygen sensor should fluctuate rapidly between 0.095 and 0.995 V. The voltage should read higher than 0.600 V several times
and lower than 0.350 V several times. The voltage should never exceed 1.00 V when using the Hi-Scan Pro.
If an Accent, Elantra or Tiburon front or rear oxygen sensor reads a fixed value of 0.425 V to 0.500 V, or a rear oxygen sensor reads a fixed value of
0.425 V to 0.500 V, or a Sonata reads a fixed value of 0.010 -0.080 V, check for an open/shorted oxygen sensor circuit or no output from the sensor.
The Hi-Scan Pro can also be used to check the sensors while the vehicle is being driven. An assistant is needed to perform this procedure. Use the
Hi-Scan Pro as set up in the previous test procedure.
1. While driving in first gear, accelerate so the engine speed is near 4000 rpm. Quickly release the accelerator and observe the readings from both
sensors. The sensors should read lean (in the range of 0.20 V down to 0 V) on the Hi-Scan Pro due to the fuel cutoff during deceleration.
2. While driving in first gear, accelerate hard and observe both sensors. The sensors should read rich (in the range of 0.60 V to 1.0 V) on the Hi-Scan
Pro.
Oxygen sensors can be monitored using HDS. The sensors can be observed using either "Custom Meters" or "Signal Wave Forms" on the HDS unit. It
is preferable to use "signal Wave Forms" since the signal resolution is better with the engine operating at 2500 rpm, which is required for proper
testing.
The HDS testing procedure requires a more involved set up but provides more detailed information about the sensors' performance. Refer to Technical
Service Bulletin #97-36-004 for the testing procedure.
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
engine control module (ECM). (This offset is not present when using the Scan Tool.) The offset has no affect on the sensor signal appearance or
frequency.
The oxygen sensor voltage offset (or bias voltage) observed when using the Hyundai Diagnostic System (HDS) was 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.
Oxygen Sensor Diagnostic Trouble Codes
