{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"TGTE","section_name":"Troubleshooting 2JZ-GTE","page":48,"pages_in_section":113,"title":"Dtc 25 26 Air–Fuel Ratio Lean Rich Malfunction","section_header":"Engine — 2JZ-GTE Engine Troubleshooting","ocr_text":"EG–534\n\nENGINE – 2JZ–GTE ENGINE TROUBLESHOOTING\n\nDTC 25 26 Air–Fuel Ratio Lean Rich Malfunction\n\nCIRCUIT DESCRIPTION\n\nSee EG–525 for the circuit description.\n\nDTC No. | Diagnostic Trouble Code Detecting Condition | Trouble Area\n\n25\n(1) Main heated oxygen sensor voltage is\n0.45 V or less (lean) for 90 sec. under\nconditions (a) and (b):\n(2 trip detection logic)*2\n(a) Engine coolant temp.: 70°C (158°F)\nor more\n(b) Engine speed: 1,500 rpm or more\n• Open or short in main heated oxygen\nsensor circuit\n• Main heated oxygen sensor\n• Ignition system\n• ECM\n\n(2) Engine speed varies by more than 20 rpm\nover the preceding crank angle period\nduring a period of 25 sec. or more under\nconditions (a) and (b):\n(2 trip detection logic).*\n(a) Engine speed: Below 950 rpm\n(b) Engine coolant temp.: 80°C\n(176°F) or\nmore\n• Open and short in injector circuit\n• Fuel line pressure (injector leak, blockage)\n• Mechanical system malfunction\n(skipping teeth of timing belt)\n• Ignition system\n• Compression pressure (foreign object\ncaught in valve)\n• Mass air flow meter (air intake)\n• ECM\n\n26\nEngine speed varies by more than 20 rpm over\nThe preceding crank angle period during a\nPeriod of 25 sec. or more under conditions (a)\nAnd (b):\n(2 trip detection logic).*\n(a) Engine speed: Below 950 rpm\n(b) Engine coolant temp.: 80°C\n(176°F) or\nmore\n• Open and short in injector circuit\n• Fuel line pressure (injector leak, blockage)\n• Mechanical system malfunction\n(skipping teeth of timing belt)\n• Ignition system\n• Compression pressure (foreign object\ncaught in valve)\n• Mass air flow meter (air intake)\n• ECM\n\n*: See page 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