Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 1999 Mercury Tracer, 1999 Mercury Sable, 1999 Mercury Mystique, 1999 Mercury Mountaineer, and 1999 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This DTC indicates that On Board Diagnostics II (OBD-II) system self-testing has not been completed. To clear DTC P1000, a complete drive cycle, with successful OBD-II system self-test must occur.

A drive cycle consists of vehicle warmed to normal engine temperature and operated in all speed ranges. 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.

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

1) DTC P1000: Check For Other DTCs

If any other DTCs are present, service DTCs as necessary. 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) Check PTO PID

Turn ignition off. Connect scan tool to Data Link Connector (DLC). Start engine and allow to idle. Using scan tool, select PTO STAT PID. Cycle PTO switch/activator on and off. If PID value does not cycle ON, DELAY and then OFF, go to TEST FB . If PID value cycles ON, DELAY and then OFF, PTO circuit is okay. Go to next step.

3) Attempt To Clear DTC P1000

Perform OBD-II DRIVE CYCLE. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS. After drive cycle is complete, repeat QUICK TEST .