200SX L4-1998cc 2.0L DOHC MFI (SR20DE) (1995)
Oxygen Sensor: Testing and Inspection
Front Heated Oxygen Sensor
With CONSULT
OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the front heated oxygen sensor circuit. During this check, a Diagnostic Trouble
Code (DTC) might not be confirmed.
1) Start engine and warm it up sufficiently.
2) Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode with CONSULT, and select "FR O2 SENSOR" and "FR O2 MNTR".
3) Hold engine speed at 2,000 rpm under no load during the following steps.
4) Touch "RECORD" on CONSULT screen.
5) Make sure of the following.
^
"FR O2 MNTR" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds.
5 times (cycles) are counted as shown below:
cycle | 1 | 2 | 3 | 4 | 5 |
FR O2 MNTR R-L-R-L-R-L-R-L-R-L-R
R = "FR 02 MNTR", "RICH"
L = "FR O2 MNTR", "LEAN"
^
"FR O2 SENSOR" voltage goes above 0.6 volts at least once.
^
"FR O2 SENSOR" voltage goes below 0.35 volts at least once.
Without CONSULT
OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the front heated oxygen sensor circuit. During this check, a Diagnostic Trouble
Code (DTC) might not be confirmed.
1) Start engine and warm it up sufficiently.