Reference Voltage

Faults in sensor reference voltage or signal return circuits should set a Diagnostic Trouble Code (DTC). See QUICK TEST in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. If no DTC has been set, see TEST C under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article for FRT reference voltage and signal return circuit testing.