Performing Self-Test

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.

To perform self-test, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps:

Select VEHICLE & ENGINE SELECTION menu.
Select NEW VEHICLE, YEAR & MODEL.
Select DIAGNOSTIC DATA LINK.
Select PCM-POWERTRAIN CONTROL MODULE.
Select DIAGNOSTIC TEST MODE.
Select RETRIEVE/CLEAR CONTINUOUS DTCs.
Turn ignition on.
Follow operating instructions from scan tool menu.
Record and DTCs that are present.

An injector circuit fault can result in unrelated DTCs being received from PCM. If engine idles rough or Continuous Memory DTCs are present, turn ignition on. Using scan tool, select INJxF PIDs from PID/DATA monitor menu. There is one INJxF PID available for each engine cylinder and the "x" indicates the appropriate injector number (1-10). If any PID value indicates YES, an injector fault exists. Turn ignition off and disregard any DTCs that are present at this time. On Natural Gas models, go to TEST HA, step 60) under SYSTEM TESTS. On all other models, go to TEST H, step 56) under SYSTEM TESTS. If all PID values indicate NO, service any DTCs that are present. See DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS . After test is complete, cycle ignition switch before performing other self-tests or driving vehicle.