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1: If the engine speed decreased slowly, there may have been a decrease in torque due to an air-fuel ratio that was incorrect (by approximately 20 to 30%), etc. If the engine speed decreased rapidly, there may have been a malfunction such as when the engine misfires almost continuously due to ignition stoppage, fuel injection stoppage, etc., or when the external load increases due to an external part malfunctioning. 2: If the air-fuel ratio is abnormal, there may have been an intake air leak, sensor malfunction, or fuel supply problem. If the vehicle was normal, the air volume may have been insufficient or the ignition timing may have been incorrect. P1605 inspection flow: Narrow down the parts to be inspected according to the vehicle conditions at the time when the malfunction occurred (freeze frame data). ENGINE SPEED SUSPECTED AREA PRIMARY PARTS TO INSPECT PROCEDURE Slowly decreases and engine stalls Ignition system abnormal Igniter abnormal Power supply circuit Ignition coil assemblies Spark plug 10, 38, 52 Air-fuel ratio abnormal Air suction Air induction system connections Purge VSV system Brake booster 5 to 9 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P160... |