Diagnosis & Repair

NOTE: Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame records engine conditions when malfunction is detected, when trouble shooting it is useful for determining whether vehicle was running or stopped, engine warmed up or not, air-fuel ratio lean or rich, etc. at time of malfunction.

For wiring diagram, see DTC P0125: INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL . For diagnosis and repair, see Fig 1, Figure and Fig 2 . To go to relevant DTC chart, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . To identify circuits referenced in testing, See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. To monitor DATA LIST, see DATA LIST under SELF-DIAGNOSTIC SYSTEM. For testing of systems or components, see BASIC DIAGNOSTIC PROCEDURES - 4-CYL article or SYSTEM & COMPONENT TESTING - 4-CYLINDER article. For removal and installation of components, see REMOVAL & INSTALLATION - 4-CYLINDER article. To check ECM inputs or outputs, see PIN VOLTAGE CHARTS article. To check for intermittent problems, see INTERMITTENT PROBLEM CHECK under SELF-DIAGNOSTIC SYSTEM.

Fig 1: DTC P0133 Diagnostic Procedure (Steps 1-3)

Fig 2: DTC P0133 Diagnostic Procedure (Steps 10-11)