{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"TGE","section_name":"Troubleshooting 2JZ-GE","page":48,"pages_in_section":105,"title":"Dtc 25 26 Air–Fuel Ratio Lean Rich Malfunction","section_header":"Engine — 2JZ-GE Engine Troubleshooting","ocr_text":"EG–428\n\nENGINE – 2JZ–GE ENGINE TROUBLESHOOTING\n\nDTC 25 26 Air–Fuel Ratio Lean Rich Malfunction\n\nCIRCUIT DESCRIPTION\nSee page EG–419 for the circuit description\n\nDTC No. | Diagnostic Trouble Code Detecting Condition | Trouble Area\n\n(1) (Main heated*1) oxygen sensor voltage is\n0.45 V or less (lean) for 90 sec. under codi–\ntions (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*1) oxygen\nsensor circuit\n• (Main heated*1) oxygen sensor\n• Ignition system\n• ECM\n\n(2)*1 Difference of air–fuel ratio feedback\ncompensation value between front (No.\n1 ~ 3 cylinders) and rear (No. 4 ~ 6\ncylinders) is more than 15 percentage for\n20 sec. or more under conditions (a)\nand (b):\n(2 trip detection logic)*2\n(a) Engine speed: 2,000 rpm or more\n(b) Engine coolant temp.: Between 60°C\n(140°F) and 95°C (203°F)\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 caught\nin valve)\n• Volume air flow meter (air intake)\n• ECM\n\n25\n\n(3)*1 Engine speed varies by more than 15 rpm\nover the preceding crank angle period\nduring a period of 20 sec. or more under\nconditions (a) and (b):\n(2 trip detection logic)*2\n(a) Engine speed: Idling\n(b) Engine coolant temp.: Between 60°C\n(140°F) and 95°C (203°F)\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 caught\nin valve)\n• Volume air flow meter (air intake)\n• ECM\n\n(1)*1 Difference of air–fuel ratio feedback\ncompensation value between front (No.\n1 ~ 3 cylinders) and rear (No. 4 ~ 6\ncylinders) is more than 15 percentage for\n20 sec. or more under conditions (a)\nand (b):\n(2 trip detection logic)*2\n(a) Engine speed: 2,000 rpm or more\n(b) Engine coolant temp.: Between 60°C\n(140°F) and 95°C (203°F)\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 caught\nin valve)\n• Volume air flow meter (air intake)\n• ECM\n\n26\n\n(2) Engine speed varies by more than 15 rpm\nover the preceding crank angle period\nduring a period of 20 sec. or more under\nconditions (a) and (b):\n(2 trip detection logic)*2\n(a) Engine speed: Idling\n(b) Engine coolant temp.: Between 60°C\n(140°F) and 95°C (203°F)\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 caught\nin valve)\n• Volume air flow meter (air intake)\n• ECM\n\n*1: Only for California specification vehicles\n*2: See page 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