Actron 9640A manual O2 Monitor Test, SelectO2MonitorTest from the Obdii, Press Grouping O2 sen

Global OBD II Diagnostics

O2 MONITOR TEST

✓The O2 Monitor Test is NOT AN ON-DEMAND TEST. O2 sensors are NOT tested when selected via the menu. The O2 sensors are tested when engine operating conditions are within specified limits.

OBD II regulations require that applicable vehicles monitor and test the oxygen (O2) sensors to determine problems related to fuel and emissions. The O2MonitorTest allows retrieval of completed O2 sensors monitor test results.

O2 sensors are located before (upstream) and after (downstream) the cata- lyst(s). The sensors are named (xy) for their position relative to both the cylinder banks and the catalysts.

•The O2 sensor for cylinder bank 1 has the prefix 1y while the O2 sensor for cylinder bank 2 has the prefix 2y.

•The O2 sensor upstream of the catalyst (closest to the engine) has the suffix x1 while the O2 sensor downstream of the catalyst has suffix x2. If the vehi- cle contains more catalysts, the O2 sensor downstream of the second cat- alyst has the suffix x3 and the O2 sensor downstream of the next catalyst has the suffix x4.

•For example, O2S 21 is the upstream O2 sensor for cylinder bank 2.

The following O2 sensor tests are available:

44	1)	Rich to Lean sensor threshold voltage
	2)	Lean to Rich sensor threshold voltage
	3)	Low sensor voltage for switch time
	4)	High sensor voltage for switch time
	5)	Rich to Lean sensor switch time
	6)	Lean to Rich sensor switch time
	7)	Minimum sensor voltage test cycle
	8)	Maximum sensor voltage test cycle
	9)	Time between sensor transitions

10) Sensor Period

SelectO2MonitorTest from the OBDII

Function List and press		.
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Select the desired test from the menu
and press	. Grouping O2 sen-

sor tests together makes the data eas- ier to compare.

✓ The O2 sensors located upstream (before the catalyst) may p rform dif- ferently than the ones located downstream (aft r the aly t).

Oxygen sensor tests not supported by the vehicle display three dashes as the value.

Press the	key to return to the O2
	BACK	to
Sensor Tests menu or press

return to the OBDII Function List.