Altima 2.5 SL L4-2.5L (QR25DE) (2002)
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Before replacing TCM, perform TCM input/output signal inspection and make sure whether TCM functions properly or not.
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After performing each TROUBLE DIAGNOSIS, perform "DTC (Diagnostic Trouble Code) CONFIRMATION PROCEDURE".
The DTC should not be displayed in the "DTC CONFIRMATION PROCEDURE" if the repair is completed.
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Before proceeding with disassembly, thoroughly clean the outside of the transaxle. It is important to prevent the internal parts from becoming
contaminated by dirt or other foreign matter.
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Disassembly should be done in a clean work area.
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Use lint-free cloth or towels for wiping parts clean. Common shop rags can leave fibers that could interfere with the operation of the transaxle.
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Place disassembled parts in order for easier and proper assembly.
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All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or reassembly.
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Gaskets, seals and O-rings should be replaced any time the transaxle is disassembled.
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It is very important to perform functional tests whenever they are indicated.
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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.
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Properly installed valves, sleeves, plugs, etc. will slide along bores in valve body under their own weight.
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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.
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Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.
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Replace ATF cooler if excessive foreign material is found in oil pan or clogging strainer.
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After overhaul, refill the transaxle with new ATF.
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When the A/T drain plug is removed, only some of the fluid is drained. Old A/T fluid will remain in torque converter and ATF cooling system.
Always follow the procedures when changing A/T fluid.
Service Notice or Precautions
FAIL-SAFE
The TCM has an electronic Fail-Safe (limp home mode). This allows the vehicle to be driven even if a major electrical input/output device circuit is
damaged.
Under Fail-Safe, the vehicle always runs in third gear, even with a shift lever position of 1, 2 or D. The customer may complain of sluggish or poor
acceleration.
When the ignition key is turned ON following Fail-Safe operation, A/T check (position) indicator lamp blinks for about 8 seconds.
The blinking of the A/T check (position) indicator lamp for about 8 seconds will appear only once and be cleared. The customer may resume normal
driving conditions.
Always follow the "Work Flow".
The SELF-DIAGNOSIS results will be as follows:
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The first SELF-DIAGNOSIS will indicate damage to the vehicle speed sensor or the revolution sensor.
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During the next SELF-DIAGNOSIS, performed after checking the sensor, no damages will be indicated.
