SYSTEM DESCRIPTION
The PCM monitors engine operation. It also contains a self-diagnostic system, which stores DTCs and compares them to On-Board Diagnostic II (OBD-II) standards.
The goal of OBD-II regulation is to provide vehicle with an on-board diagnostic system that is capable of continuously monitoring the efficiency of emission control systems, and to improve diagnosis and repair when system failures occur.
The Federal Test Procedure (FTP) sets maximum allowable emission standards. A Malfunction Indicator Light (MIL) must illuminate if a system or component either fails, or deteriorates to a point where vehicle's emissions could rise to greater than 1 1/2 times FTP standards.
DTCs may only be retrieved using an On-Board Diagnostic (OBD-II) scan tool. TECH II scan tool is recommended by manufacturer. Other suitable aftermarket scan tools are available.
DESCRIPTION
The On-Board Diagnostic II (OBD-II) System Check is the starting point for any driveability complaint diagnosis. OBD-II system check is an organized approach to identifying problems created by an electronic engine control system malfunction. Before any DTC(s) are retrieved, perform a visual underhood inspection, checking battery and grounds for clean and tight connections. Check for poor connections or damage to wiring harness and electrical connectors. Check for corroded terminals or corrosion buildup on any connection. Repair as necessary.
Use of TECH II scan tool or equivalent is required to perform On-Board Diagnostic II (OBD-II) system check.
Note. To identify component terminals and wire colors referenced in testing, see WIRING DIAGRAMS article.