AT-12
[RE4F04B]
PRECAUTIONS
Revision: November 2006
2006 Altima
Service Notice or Precautions
ECS0095N
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 cus-
tomer 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. [For “TCM Self-diagnostic Procedure (No Tools)”, refer to
.]
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” (Refer to
The SELF-DIAGNOSIS results will be as follows:
●
The first SELF-DIAGNOSIS will indicate damage to the vehicle speed sensor or the revolution sensor.
●
During the next SELF-DIAGNOSIS, performed after checking the sensor, no damages will be indicated.
TORQUE CONVERTER SERVICE
The torque converter should be replaced under any of the following conditions:
●
External leaks in the hub weld area.
●
Converter hub is scored or damaged.
●
Converter pilot is broken, damaged or fits poorly into crankshaft.
●
Steel particles are found after flushing the cooler and cooler lines.
●
Pump is damaged or steel particles are found in the converter.
●
Vehicle has TCC shudder and/or no TCC apply. Replace only after all hydraulic and electrical diagnoses
have been made. (Converter clutch material may be glazed.)
●
Converter is contaminated with engine coolant containing antifreeze.
●
Internal failure of stator roller clutch.
●
Heavy clutch debris due to overheating (blue converter).
●
Steel particles or clutch lining material found in fluid filter or on magnet when no internal parts in unit are
worn or damaged — indicates that lining material came from converter.
The torque converter should not be replaced if:
●
The fluid has an odor, is discolored, and there is no evidence of metal or clutch facing particles.
●
The threads in one or more of the converter bolt holes are damaged.
●
Transaxle failure did not display evidence of damaged or worn internal parts, steel particles or clutch plate
lining material in unit and inside the fluid filter.
●
Vehicle has been exposed to high mileage (only). The exception may be where the torque converter
clutch dampener plate lining has seen excess wear by vehicles operated in heavy and/or constant traffic,
such as taxi, delivery or police use.
ATF COOLER SERVICE
If A/T fluid contains frictional material (clutches, bands, etc.), replace radiator and flush cooler line using clean-
ing solvent and compressed air after repair of A/T. Refer to
OBD-II SELF-DIAGNOSIS
●
A/T self-diagnosis is performed by the TCM in combination with the ECM. The results can be read through
the blinking pattern of the A/T check (position) indicator or the malfunction indicator lamp (MIL). Refer to
the table on
for the indicator used to display each self-diagnostic result.
●
The self-diagnostic results indicated by the MIL are automatically stored in both the ECM and TCM mem-
ories.
Always perform the procedure “HOW TO ERASE DTC” on
to complete the repair and avoid
unnecessary blinking of the MIL.
●
The following self-diagnostic items can be detected using ECM self-diagnostic results mode* only when
the A/T check (position) indicator lamp does not indicate any malfunctions.
–
park/neutral position (PNP) switch
–
A/T 1st, 2nd, 3rd, or 4th gear function
–
A/T TCC S/V function (lock-up).
