Sonata GL V6-3.0L (1997)
The scan tool and HDS testing procedures are provided in the following section. The scan tool test is a quick procedure that provides basic sensor
information. The HDS testing procedure requires a more involved set up but provides more detailed information about the sensors performance.
Scan Tool Testing Procedure
Connect the scan tool and retrieve all diagnostic codes. Record the codes and freeze frame data (if available) for later reference.
1.
A.
Warm up the vehicle to operating temperature (for at least 3 minutes)
B.
Select vehicle, year, VIN code, etc.
C.
Select "Engine
D.
Select "Data"
E.
After OBD II data appears press "N"
F.
Select "Custom Data List"
G.
Select "O2-B1-S1" and "O2-B1-52" (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 scan tool.
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 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 scan tool can also be used to check the sensors while the vehicle is being driven. An assistant is needed to perform this procedure. Use the scan tool
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 scan tool due to the fuel cut-off 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 scan
tool.
Hyundai Diagnostic (HDS) Testing Procedure
The front and rear oxygen sensor signals can be monitored using HDS. The sensor signals can be observed using either "Custom Meters" or "Signal
Wave Forms" on the HDS machine. The "Signal Wave Forms" procedure should be used since the signal resolution is better with the engine at 2500
