Symptom Checks Using Scan Tool PIDs

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

1. 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.
2. 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.
3. 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.