Express 3/4 Ton Van V8-5.7L VIN R (1998)
cycle if the a type A or B DTC is displayed. For type C DTCs, the last failure must have occurred during the current ignition cycle to appear as Last
Test Fail.
MIL REQUEST
This selection displays only the DTCs that are requesting the MIL. Type C DTCs cannot be displayed by using this option. This selection will report
type B DTCs only after the MIL has been requested.
NOT RUN SCC (NOT RUN SINCE CODE CLEAR)
This option displays up to 33 DTCs that have not run since the DTCs were last cleared. Since any displayed DTCs have not run, their condition
(passing or failing) is unknown.
TEST FAIL SCC (TEST FAILED SINCE CODE CLEAR)
This selection displays all of the active and history DTCs that have reported a test failure since the last time the DTCs were cleared. The DTCs that
last failed over 40 warm-up cycles (before this option is selected) will not be displayed
SPECIFIC DTC MODE
This mode is used in order to check the status of the individual diagnostic tests by the DTC number. This selection can be accessed if a DTC has
passed or failed. Many OBD II DTC mode descriptions are possible because of the extensive amount of information that the Diagnostic Executive
monitors regarding each test. Some of the many possible descriptions follow with a brief explanation.
This selection only allows the entry of the DTC numbers that are supported by the vehicle that is being tested. If an attempt is made to enter the DTC
numbers for tests which the diagnostic executive does not recognize, the requested information will not be displayed correctly and the scan tool may
display an error message. The same applies to using the DTC trigger option in the Snapshot mode. If an invalid DTC is entered, the scan tool will not
trigger.
FAILED LAST TEST
For type A and B DTCs, this message will display during the subsequent ignition cycles until the test passes or the DTCs are cleared. For type C
DTCs, this message clears whenever the ignition is cycled.
FAILED SINCE CLEAR
This message displayed indicates that the diagnostic test failed at least once within the last 40 warm-up cycles since the last time the control module
cleared the DTCs.
FAILED THIS IGN. (FAILED THIS IGNITION)
This message displayed indicates that the diagnostic test has failed at least once during the current ignition cycle. This message will clear when the
DTCs are cleared or the ignition is cycled.
HISTORY DTC
This message displayed indicates that the DTC has stored to memory as a valid fault. A DTC displayed as a History fault does not necessarily mean
that the fault is no longer present. The history description means that all of the conditions necessary for reporting a fault have met.
MIL Requested
This message displayed indicates that the DTC is currently causing the MIL to turn ON. Remember that only type A and B DTCs can request the MIL.
The MIL request cannot determine if the DTC fault conditions are currently being experienced. This is because the diagnostic executive requires up to
3 trips during which the diagnostic test passes to turn OFF the MIL.
NOT RUN SINCE CL (NOT RUN SINCE CLEARED)
This message displayed indicates that the selected diagnostic test has not run since the last time the DTCs were cleared. Therefore, the diagnostic test
status (passing or failing) is unknown. After the DTCs are cleared, this message continues to be displayed until the diagnostic test runs.
NOT RUN THIS IGN. (NOT RUN THIS IGNITION)
This message displayed indicates that the selected diagnostic test has not run this ignition cycle.
TEST RAN AND PASSED
This message displayed indicates that the selected diagnostic test has the following items:
^
Passed the last test
^
Ran and passed during this ignition cycle
^
Ran and passed since the DTCs were last cleared
^
This test has not failed since the DTCs were last cleared
Whenever the indicated status of the vehicle is Test Ran and Passed after a repair verification, the vehicle is ready to be released to the customer.
If the indicated status of the vehicle is Failed This Ign after a repair verification, then the repair is incomplete. A further diagnosis is required.
Prior to repairing a vehicle, use the status information in order to evaluate the state of the diagnostic test and to help identify an intermittent problem.
