Diagnosis & Repair
For diagnosis and repair, see Fig 1 and Fig 2 . To check for intermittent problems, see INTERMITTENT PROBLEM CHECK under SELF-DIAGNOSTIC SYSTEM. For vacuum hose routing, see VACUUM DIAGRAMS article. To identify circuits referenced in testing, See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For testing of components, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article. For removal and installation of components, see REMOVAL & INSTALLATION - 4-CYLINDER article. To check ECM inputs and outputs, see PIN VOLTAGE CHARTS article.