Diagnosis & Repair
For wiring diagram, see DTC P1690: OCV FOR VVTL CIRCUIT MALFUNCTION (MATRIX 2ZZ-GE ENGINE MODEL ONLY) . For diagnosis and repair with hand-held tester, see Fig 1 and Fig 2 . For diagnosis and repair with OBD II scan tool, see Fig 3. For removal and installation of components, see REMOVAL & INSTALLATION - 4-CYLINDER article. To identify circuits referenced in testing, See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. To check ECM inputs and outputs, see PIN VOLTAGE CHARTS article. For removal of generator, see appropriate GENERATORS & REGULATORS article under CHARGING SYSTEM in ELECTRICAL. For testing of components, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article. To check for intermittent problems, see INTERMITTENT PROBLEM CHECK under SELF-DIAGNOSTIC SYSTEM.