Global OBD II Diagnostics
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✓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
From the Special Tests Menu:
1.
Select
O2 Monitor Test.
•Use
UP
or
DOWN
arrow
key until O2 Monitor Test is
highlighted.
•Press
ENTER
.
I/M Readiness ?
Drive Cycle Monitor
State OBD Check
O2 Monitor Test
Diag Mon Tests
On-Board Systems
Vehicle Info
Special Tests Menu
O2 Monitor Test