Why shouldn't you touch the terminals of electronic control units during service?

Static electrical charges stored in your body may damage the internal electronic components of parts that use microcomputers, such as electronic control units.

Which parts should be discarded and replaced with new ones during disassembly?

Oil seals, gaskets, packings, O-rings, locking washers, cotter pins, self-locking nuts, etc. should be replaced as instructed and the used ones discarded.

How should tapered roller bearings and needle bearings be replaced?

They should be replaced as a set of inner and outer races.

What should you do after disconnecting a vacuum hose or air hose?

Attach a tag indicating the proper connection to prevent incorrect reconnection.

What checks are required after repairing fuel, oil, water, vacuum or exhaust systems?

Make certain to check all affected lines for leaks.

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1990 Nissan Micra Service Manual – General Precautions Page GI-3

Nissan factory service manual general precautions page GI-3 disassembly and reassembly rules

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Factory service manual precautions page: rules for cleaning parts, replacing seals/gaskets/O-rings, handling tapered roller and needle bearings as sets, and protecting ECU terminals from static.

AI caption April 2005 · Photo 6 of 412

This is page GI-3 of a factory service manual's General Information "Precautions" section, uploaded as part of a 1990 Nissan Micra document set. The page lists general service precautions numbered 7 through 17, continuing from a previous page. Key instructions include: cleaning disassembled parts in designated solvent before inspection or assembly; replacing and discarding used oil seals, gaskets, packings, O-rings, locking washers, cotter pins and self-locking nuts; replacing tapered roller and needle bearings as complete inner/outer race sets; arranging disassembled parts in their assembled order; avoiding touching terminals of microcomputer-equipped electrical components (such as electronic control units) because static electricity can damage internal electronics; tagging disconnected vacuum or air hoses to prevent incorrect reconnection; using only specified lubricants and approved bonding agents or sealants; using proper and recommended essential tools; checking fuel, oil, water, vacuum and exhaust lines for leaks after repairs; and disposing of drained oil or cleaning solvent appropriately. An illustration (figure SGI234) shows a technician using a seat cover and fender cover to protect the vehicle during engine-compartment work. The page contains no fuse data, torque values, or part numbers — it is general shop-practice guidance applicable to servicing the whole vehicle.

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Frequently asked questions

Why shouldn't you touch the terminals of electronic control units during service?: Static electrical charges stored in your body may damage the internal electronic components of parts that use microcomputers, such as electronic control units.
Which parts should be discarded and replaced with new ones during disassembly?: Oil seals, gaskets, packings, O-rings, locking washers, cotter pins, self-locking nuts, etc. should be replaced as instructed and the used ones discarded.
How should tapered roller bearings and needle bearings be replaced?: They should be replaced as a set of inner and outer races.
What should you do after disconnecting a vacuum hose or air hose?: Attach a tag indicating the proper connection to prevent incorrect reconnection.
What checks are required after repairing fuel, oil, water, vacuum or exhaust systems?: Make certain to check all affected lines for leaks.