Range Rover (LP) V8-4.0L (1999)
proceeding with test.
1.
Calibrate lead set for accurate voltage readings.
2.
Switch off A/C compressor.
3.
Set Uniscope red channel on ± 7 VDC and 32 ms.
4.
Back probe pin 33 of red 36 pin connector for bank B, or pin 34 for bank A sensors.
5.
Run engine to operating temperature (approx. 195°F) then heat engine and HO2S's fully by running engine 2-3 minutes at 2500 rpm. Let idle for 5
seconds but no more than 20 seconds.
6.
Push record on Uniscope.
7.
Rev the engine rapidly four to five times in 2 second intervals from idle to wide open throttle (do not exceed 300 rpm).
8.
Examine recording frame by frame. set cursor # 1 at maximum HO2S voltage and take a reading; record maximum voltage results. Set cursor # 2
on minimum HO2S voltage and record results.
9.
Measure rich-lean response times.
NOTE: Do not judge response times at the beginning of the record cycle (i.e. frames 1-3).
10.
Print screens using print icon on upper right corner of screen.