Possible Causes

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Throttle adaptations not performed after battery disconnect.
TPS disconnected.
TPS to ECM sensing circuits open or high resistance.
Throttle motor power relay failure.
Throttle motor power relay to ECM circuit fault.
Throttle motor power relay power supply open circuit.
ECM ground circuit fault (relay coil drive).
Throttle motor to ECM drive circuits open, shorted or high resistance.
Throttle motor failure.
Throttle assembly failure.