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Vehicle Diagnostics
4
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
“
Diagnostic Monitor Tests
” on page 4-25 to see O2
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
1
y while O2 sensor
for cylinder bank 2 has prefix
2
y.
❒
The O2 sensor upstream of catalyst (closest to engine) has suffix
x
1
while O2 sensor downstream of catalyst has suffix x
2
. If
vehicle contains more catalysts, O2 sensor downstream of
second catalyst has suffix x
3
and O2 sensor downstream of next
catalyst has suffix x
4
.
❒
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
Summary of Contents for AutoScanner Plus CP9180
Page 1: ...AutoScanner Plus P N 0002 000 2935 CP9180 ...
Page 26: ...Getting Started 2 10 2 ...
Page 88: ...Troubleshooting 5 6 8 ...
Page 92: ...PID Definitions A 4 A ...
