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On-Board Diagnostics (OBD) Basics Diagnostic Service Definitions

If an OBDMID has not been completed at least once since Service $04 or battery disconnect, then

the following properties of the parameter are set to zero by the ECM:

• Test Value (Results)

• Minimum Test Limit

• Maximum Test Limit

Non CAN Protocol

The vehicle manufacturer is responsible for assigning Test IDs and Component IDs for tests of

different systems and components. The latest test results are to be retained, even over multiple

ignition OFF cycles, until replaced by more recent test results. Test results are requested by Test

ID. Test results are reported only for supported combinations of test limit type and component ID

and are reported as positive (unassigned) values. Service $06 test values and limits are raw

values that not scaled.

To date, only some manufacturers have provided conversion factors for technicians to use this

data. See the example below for a US Ford version of Service $06 Catalytic Converter test results.

Table 4-5

Test ID Table for CAN Protocol

Test ID No. Description

$01 Rich to Lean sensor threshold voltage, (Constant)

$02 Lean to Rich sensor threshold voltage, (Constant)

$03 Low sensor voltage for switch time calculation, (Constant)

$04 High sensor voltage for switch time calculation, (Constant)

$05 Rich to Lean sensor switch time, (Calculated)

$06 Lean to Rich sensor switch time, (Calculated)

$07 Minimum sensor voltage for test cycle, (Calculated)

$08 Maximum sensor voltage for test cycle, (Calculated)

$09 Time between sensor transitions, (Calculated)

$0A Sensor Period, (Calculated)

$0B

EWMA (Exponential Weighted Moving Average) misfire counts for last

10 driving cycles (calculated)

Calculation: 0.1 * (current counts) + 0.9 * (previous average)

Initial value for (previous average) = 0

$0C Misfire counts for last/current driving cycles (calculated)

Table 4-6 Service $06 Catalytic Converter test results

Test ID Comp ID Test Value Min. Max

$10 $11 Cat monitor Switch ratio Bank1 45 0 48

$10 $21 Cat monitor Switch ratio Bank2 42 0 48

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 71 72

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