Test Value & Test Limit (GST Only)
The following information is specified in Mode 6 of SAE J1979. The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored. Items for which these data sets (test value and test limit) are displayed are the same as SRT code items (30 test items). These data sets (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be displayed on the GST screen. See Fig 1.