Well each electronic part can be tested via the FSM.
Yet before I'd replace an untested MAF, I'd make sure I cleaned the IAC very well.
Luck and enjoy the Runner.
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.