Symptom Checks Using Scan Tool PIDs

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Check and compare the following PID values to PID specifications in appropriate PIN VOLTAGE/PID VALUE CHARTS article.

NOTE: On some models, DPFEGR PID may not be available.

DPFEGR

If DPFEGR HOT IDLE PID is not within .15 volt of KOEO value, go to TEST HE, step 100) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.

LONGFT1 &/Or LONGFT2

If LONGFT1 or LONGFT2 PID is low (-20 percent or less), concentrate checks in areas that would cause engine to run rich. If LONGFT1 or LONGFT2 PID is high (+20 percent or more), concentrate checks in areas that would cause engine to run lean.

VPWR

VPWR PID voltage should be 10.5-17.0 volts and within .5 volt of battery voltage. If VPWR PID voltage is not 10.5-17.0 volts, check and repair charging system as necessary. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If VPWR PID voltage is 10.5-17.0 volts but not within .5 volt of battery voltage, check B+ circuit to PCM power relay (or CCRM), VPWR circuit between PCM and PCM power relay or CCRM, and PWR GND circuits. See WIRING DIAGRAMS article.