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Frontier Nissan Frontier/HB/Truck Discussion Forum

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Old 07-28-2019, 04:22 PM
F & R Imports F & R Imports is offline
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1987 Frontier
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Default 87 truck

does anyone out there know how to reset the ecm on a 87 d21 4 cyl truck? mine is in limp-in mode and won't rev over 3000 rpm
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Old 08-03-2019, 09:01 PM
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smj999smj smj999smj is offline
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In order to get it out of limp mode, you need to fix the problem. The only way to "reset" the ECM, which is really just erasing the self-learning memory, is to disconnect the battery cable for several minutes or, if it's a 5-mode ECM with a mode screw (as opposed to a 2-mode with a toggle switch), cycle though all 5 modes until you come back to mode 1.
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