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An easy way to diagnose a bad fuel pump switch is to test the terminal or wire coming from the fuel pump output of the ecu. The ecu switch's to ground and there should be an extremely low level of voltage at this location if any at all, if your multi meter picks up anything it will be in the millivolt (MV) range of the meter. If you are getting a battery voltage such as 12v+ then this is usually the issue. Part is to be installed with the writing facing the front label of the ecu case in the QM1 location.
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🇺🇸 Ship from USA · On Agora since 2025
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