O2 Monitor Test - Actron CP9180 Manual

Vehicle Diagnostics

O2 Monitor Test

OBD II regulations require applicable vehicles monitor and test oxygen
(O2) sensors to determine problems related to fuel and emissions. The
O2 Monitor Test allows retrieval of completed O2 sensors monitor test
results.
✓
The O2 Monitor Test is not an on-demand test. O2 sensors are not
tested when selected via the menu. O2 sensors are tested when
engine operating conditions are within specified limits.
✓
If the vehicle communicates using a controller area network (CAN),
O2 monitor tests are not supported by vehicle. A message is
displayed. See "
monitor data.
✓
O2 sensors are located before (upstream) and after (downstream)
catalyst(s). Sensors are named (xy) for their position to both cylinder
banks and catalysts.
❒
The O2 sensor for cylinder bank 1 has prefix 1y while O2 sensor
for cylinder bank 2 has prefix 2y.
❒
The O2 sensor upstream of catalyst (closest to engine) has suffix
x1 while O2 sensor downstream of catalyst has suffix x2. If
vehicle contains more catalysts, O2 sensor downstream of
second catalyst has suffix x3 and O2 sensor downstream of next
catalyst has suffix x4.
❒
For example, O2S21 is upstream O2 sensor for cylinder bank 2.
The following O2 Sensor Tests are available:
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
11) Manufacturer specific tests
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Diagnostic Monitor Tests
" on page 4-25 to see O2
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