Xterra XE 4WD V6-3.3L SC (VG33ER) (2002)
Engine Control Module: Service Precautions
Observe the precautions to ensure safe and proper servicing.
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Before connecting or disconnecting any harness connector for the multiport fuel injection system or ECM:
Turn ignition switch to OFF position.
Disconnect negative battery terminal.
Otherwise, there may be damage to ECM.
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Before disconnecting pressurized fuel line from fuel pump to injectors, be sure to release fuel pressure.
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Be careful not to jar components such as ECM and mass air flow sensor.