What valves are in the Nissan automatic transaxle control valve body?

The diagram labels: throttle modulator valve, pressure modifier valve, 1st reducing valve, top reducing valve, 3rd-2nd timing valve, manual valve, detent valve, speed cut valve, fail-safe valve, 1st-2nd control valve, 1st-2nd shift valve, 2nd-3rd shift valve, 3rd-2nd downshift valve, pressure regulator valve, back-up valve, throttle valve, and lock-up control valve.

What lubricant should be applied to transaxle parts before assembly?

Apply a coat of recommended A.T.F. (automatic transmission fluid) to all parts. Vaseline may be applied to O-rings and seals, but do not use any grease.

What do the abbreviations D1, D2 and D3 mean in this manual section?

D1 is Drive range 1st gear, D2 is Drive range 2nd gear, and D3 is Drive range 3rd gear. Similarly, 22/21 are 2 range 2nd/1st gear and 12/11 are 1 range 2nd/1st gear.

Should gaskets, seals and O-rings be reused when servicing the transaxle?

No — the notes state gaskets, seals and O-rings should be replaced, and care taken to avoid damaging them during assembly.

Why shouldn't common shop rags be used when cleaning transaxle parts?

Shop rags can leave lint that might interfere with the transaxle's operation; use a nylon cloth or paper towel instead.

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Nissan Micra Automatic Transaxle Service Notes & Control Valve Body Diagram AT-3

General service notes for automatic transaxle disassembly plus a labeled control valve schematic identifying each valve

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Service manual page AT-3 with general repair notes and a labeled control valve schematic for the automatic transaxle.

AI caption October 2005 · Photo 182 of 412

This is page AT-3 ("General Service Notes") from the automatic transaxle (AT) section of a Nissan factory service manual, uploaded to a 1990 Nissan Micra gallery. The upper half contains "Repair Notes": general precautions for disassembling and servicing an automatic transaxle, including cleaning the outside of the unit before disassembly, working in a clean area, using nylon cloth or paper towels rather than lint-shedding shop rags, keeping parts in order on a parts rack, cleaning parts in non-flammable solvent, replacing gaskets/seals/O-rings, handling the precision valve body carefully, coating parts with A.T.F. before assembly (Vaseline permitted on O-rings and seals, no grease), and avoiding damage to seals during assembly. A list of section abbreviations follows (A.T.F., D1, D2, D3, 22, 21, 12, 11 for the various drive/gear ranges). The lower half is a labeled "Control Valve" (valve body) diagram identifying seventeen valves, including the throttle modulator, pressure modifier, 1st reducing, top reducing, 3rd-2nd timing, manual, detent, speed cut, fail-safe, 1st-2nd control, 1st-2nd shift, 2nd-3rd shift, 3rd-2nd downshift, pressure regulator, back-up, throttle, and lock-up control valves. Illustration reference: SAT683.

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Frequently asked questions

What valves are in the Nissan automatic transaxle control valve body?: The diagram labels: throttle modulator valve, pressure modifier valve, 1st reducing valve, top reducing valve, 3rd-2nd timing valve, manual valve, detent valve, speed cut valve, fail-safe valve, 1st-2nd control valve, 1st-2nd shift valve, 2nd-3rd shift valve, 3rd-2nd downshift valve, pressure regulator valve, back-up valve, throttle valve, and lock-up control valve.
What lubricant should be applied to transaxle parts before assembly?: Apply a coat of recommended A.T.F. (automatic transmission fluid) to all parts. Vaseline may be applied to O-rings and seals, but do not use any grease.
What do the abbreviations D1, D2 and D3 mean in this manual section?: D1 is Drive range 1st gear, D2 is Drive range 2nd gear, and D3 is Drive range 3rd gear. Similarly, 22/21 are 2 range 2nd/1st gear and 12/11 are 1 range 2nd/1st gear.
Should gaskets, seals and O-rings be reused when servicing the transaxle?: No — the notes state gaskets, seals and O-rings should be replaced, and care taken to avoid damaging them during assembly.
Why shouldn't common shop rags be used when cleaning transaxle parts?: Shop rags can leave lint that might interfere with the transaxle's operation; use a nylon cloth or paper towel instead.