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On-Board Diagnostics (OBD) Basics Diagnostic Service Definitions

4.4.5 Service $05:

Oxygen Sensor Monitoring Test Results

The purpose of this service is to allow access to the on-board oxygen sensor monitoring test

results (if implemented).

NOTE:

i Service $05 is not supported on CAN vehicles, and oxygen sensor test results are incorporated

into Service $06. Manufacturers are allowed to use Service $06 as an alternative to Service $05

for non-CAN vehicles.

Different manufacturers may use many methods to calculate test results for this service. The scan

tool converts test values and displays them in the standard units of measurement.

The ECM transmits the latest test results available from the system. Test results are retained by

the ECM, even over multiple ignition OFF cycles, until replaced by the results of a more recent

test. Test results are requested by Test ID. (See Test ID Table).

Test results can be reported either as a constant or as a calculated value, depending on the Test

ID. Calculated values are reported with minimum and maximum limits.

NOTE:

i Depending on the manufacturer, calculated values may be rounded off, which means that a test

may fail despite the values reading within min. and max limits.

The scan tool checks if the readiness status of oxygen sensors is completed. If the test is not

completed, the scan tool displays a warning.

Figure 4-4

Test ID Values Example

NOTE:

i Refer to Table 4-4 for an explanation of the individual Test ID numbers.

$06 $05

$07

$08

$0A $09

$04

$03

$02 $01

Rich

Lean

Oxygen Sensor Output

Numbers Refer to Test ID

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 71 72

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