(a) Primary System-Based Diagnostics

(a) Primary System-Based Diagnostics
There are primary system-based diagnostics which evaluate system operation and its effect on vehicle emissions.

The primary system-based diagnostics are listed below with a brief description of the diagnostic function:

(b) Oxygen Sensor Diagnosis
(b) Oxygen Sensor Diagnosis

(c) Fuel Control Heated Oxygen Sensor
(c) Fuel Control Heated Oxygen Sensor

(d) Heated Oxygen Sensor (HO2S) Heater
(d) Heated Oxygen Sensor (HO2S) Heater

(e) Catalyst Monitor HO2S and Diagnostic Operation
(e) Catalyst Monitor HO2S and Diagnostic Operation

(f) Catalyst Monitor Outputs
(f) Catalyst Monitor Outputs

(g) Three-Way Catalyst Oxygen Storage Capacity
(g) Three-Way Catalyst Oxygen Storage Capacity

(h) Evaporative Emission (EVAP) Purge System Vacuum Switch
(h) Evaporative Emission (EVAP) Purge System Vacuum Switch