Automatic Transmission: Precautions: Precautions

Before connecting or disconnecting the A/T assembly harness connector, turn ignition switch OFF and disconnect the battery cable from the negative terminal. Because battery voltage is applied to TCM even if ignition switch is turned OFF.

Fig 1: Disconnecting Negative Battery Cable First
Courtesy of NISSAN MOTOR CO., U.S.A.
After performing each TROUBLE DIAGNOSIS, perform "DTC (Diagnostic Trouble Code) Confirmation Procedure". If the repair is completed the DTC should not be displayed in the "DTC Confirmation Procedure".

Fig 2: "SERVICE ENGINE SOON" Malfunction Indicator Lamp

Courtesy of NISSAN MOTOR CO., U.S.A.

When removing the transmission from a vehicle, do not use the companion flange section at the rear end of the transmission as a support point. (VK45DE models only)
Always use the specified brand of ATF. Refer to "FLUIDS AND LUBRICANTS ". Also, refer to Technical Service Bulletin INFINITI; SPECIAL AUTOMATIC TRANSMISSION FLUID REQUIREMENT .
Use lint-free paper not cloth rags during work.
After replacing the ATF, dispose of the waste oil using the methods prescribed by law, ordinance, etc.
Before proceeding with disassembly, thoroughly clean the outside of the transmission. It is important to prevent the internal parts from becoming contaminated by dirt or other foreign matter.
Disassembly should be done in a clean work area.
Use lint-free paper or towels for wiping parts clean. Common shop rags can leave fibers that could interfere with the operation of the transmission.
Place disassembled parts in order for easier and proper assembly.

Fig 3: Warning Do Not Hang/Support Transmission At Companion Flange
Courtesy of NISSAN MOTOR CO., U.S.A.
All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or reassembly.
Gaskets, seals and O-rings should be replaced any time the transmission is disassembled.
It is very important to perform functional tests whenever they are indicated.
The valve body contains precision parts and requires extreme care when parts are removed and serviced. Place disassembled valve body parts in order for easier and proper assembly. Care will also prevent springs and small parts from becoming scattered or lost.
Properly installed valves, sleeves, plugs, etc. will slide along bores in valve body under their own weight.
Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings and seals, or hold bearings and washers in place during assembly. Do not use grease.
Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.

Clean or replace ATF cooler if excessive foreign material is found in oil pan or clogging strainer. Refer to "ATF COOLER SERVICE ".
After overhaul, refill the transmission with new ATF.
When the A/T drain plug is removed, only some of the ATF is drained. Old ATF will remain in torque converter and ATF cooling system.
Always follow the procedures under "CHANGING A/T FLUID " when changing A/T fluid.