Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This DTC indicates that not all of the On Board Diagnostics II (OBD-II) monitors have completed. DTC P1000 can only be removed from memory with a complete drive cycle, with all OBD-II monitors being successfully completed.

A drive cycle consists of vehicle warmed to normal engine temperature and operated in specific speed ranges. See DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. After self-test successfully completes, SYSTEM PASS can be obtained from PCM.

DTC P1000 will set in PCM memory when any of the following conditions occur:

Vehicle is new from factory and has not yet completed an OBD-II drive cycle.
Battery or PCM has been disconnected.
An OBD-II monitor has failed before completion of OBD-II drive cycle.
PCM memory has been cleared with a scan tool.

NOTE: DTC P1000 cannot be cleared from PCM if vehicle is equipped with Power Take Off (PTO) and circuit is shorted to VPWR or B+, or if PTO is on during testing.

1) DTC P1000: Check For Other DTCs

If any other DTCs are present, service DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no other DTCs are present and vehicle is equipped with PTO, go to next step. If no other DTCs are present and vehicle is not equipped with PTO, go to step 3).

2) Request To Clear DTC P1000

If customer has requested to have DTC P1000 cleared from memory, perform OBD-II drive cycle. See DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. After OBD-II drive cycle is complete, repeat QUICK TEST . If customer has not requested to have DTC P1000 cleared from memory, inform customer that some state laws require DTC P1000 to be cleared before an inspection or maintenance test is performed, and that additional driving may be in order to clear DTC P1000.