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Interpreting the Calibration parameters

The description below is presented twice since the fault counter behaves differently depending on what type of DTC that is being monitored. See the article Interpreting information in the Graph view for further information.

Unconfirmed DTC limit is +127

The description below is applicable when the Unconfirmed limit and the Failed limit are the same i.e. +127. Please refer to the article Interpreting the Fault counter for further details about the Fault counter.

 

Figure description (number 1-4)

Fig. No.

Description

1

Confirmed limit

2

Failed limit

3

Passed limit

4

Aged limit

 

Calibration parameters in figure (number 1 and 4)

Calibration parameter

Description

Confirmed limit

Number of consecutive control module operation cycles in which the fault counter reach the Failed limit (at least once) until the DTC is confirmed. See fig. no. 1.

Failed inhibited

N/A

Unconfirmed limit

N/A

Aged limit

Number of consecutive control module operation cycles in which the fault counter reach the Passed limit (at least once) and never the Failed limit until the DTC is aged. See fig. no. 4.

Step up

N/A

Step down

N/A

 
Fig. 412: Illustrative example of the Calibration parameters
 

Color legend

Color

Description

Confirmed

Pending

Failed

Passed

Aged

#1 - #255 in the figure represent control module operation cycles.

Unconfirmed DTC limit is less than +127

The description below is applicable when the Unconfirmed limit is less than the Failed limit i.e. less than +127. Please refer to the article Interpreting the Fault counter for further details about the Fault counter.

 

Figure description (number 1-8)

Fig. No.

Description

1

Confirmed limit

2

Failed limit

3

Unconfirmed limit

4

Aged limit

5

Step up

6

Step down

7

Passed limit

8

Aged limit

 

Calibration parameters in figure (number 1-6)

Calibration parameter

Description

Confirmed limit

Number of consecutive control module operation cycles in which the fault counter reach the Failed limit (at least once) until the DTC is confirmed. See fig. no. 1.

Failed inhibited

If the Failed limit is inhibited, the maximum value that the fault detection counter can reach is less than +127. In such case the test can never be failed. See fig. no. 2.

Unconfirmed limit

Number of consecutive times a fault is detected by the test and the fault counter step up until the DTC is unconfirmed. See fig. no. 3.

Aged limit

Number of consecutive control module operation cycles in which the fault counter reach the Passed limit (at least once) and never the Failed limit until the DTC is aged. See fig. no. 4.

Step up

Step up value (in the range 1 to 127) that the fault detection counter takes each time a fault is detected by the test. See fig. no. 5.

Step down

Step down value (in the range 1 to 128) that the fault detection counter takes each time a fault is not detected by the test. See fig. no. 6.

 
Fig. 413: Illustrative example of the Calibration parameters
 

Color legend

Color

Description

Confirmed

Pending

Failed

Passed

Aged

#1 - #255 in the figure represent control module operation cycles.