Toyota Hi Ace Auto Commuter Bus 200 Series - Year 2005 - Model TRH223R - Eng 2TR-FE 2.7 Ltr Recently purchased. MIL light on - Scan tool Shows code P0171 $07E8 Monitor / Generic Lean Trim. Cleared as vehicle had travelled 12,800 since logged. After drive cycle / Logged again. Code logs after being stopped & restarted. Live data shows MAF 2.67 g/s - Short term fuel trim 3.9% - Long term 39.8% Oxygen sensor 2 = 0.23 V - Oxy Sensor 1 = 3.2 V - Monitor checks for Co2 1 & 2 sensors indicating Ok - MAF Indicating Ok - Have carried out checks for air leaks in intake exhaust, checked spark plugs etc - Albeit have not yet checked fuel pressure - Seem to going around in circles & starting to do my head in - Any ideas/thoughts appreciated - Code P0301 {Eng Misfire #1 Also Was Originally Logged}, But Hasn't Been Reset Since Initial Codes Were Cleared
If Short term # is high while underway, but normal while idling, you could have a scewed maf signal. Sometimes cleaning maf with carb cleaner helps. If no intake leaks are found, and fuel pressure and volume are ok, it could be maf sensor.
Fig. Accessory drive belt routing-2.7L (2TR-FE) engine
Fig. Accessory drive belt routing-2.7L (3RZ-FE/M) engine
Fig. Accessory drive belt routing-2.4L engine 
Fig. Accessory drive belt routing-2.7L (3RZ-FE/M) engine 
Fig. Accessory drive belt routing-2.7L (2TR-FE) engine 
Fig. Accessory drive belt routing-3.4L engine
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