Eclipse FWD L4-1997cc 2.0L DOHC MFI (1997)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
A/T - Poor Shift Quality
No: TSB-98-23-003 REV
DATE: April, 1998
MODEL: 1996-97 Eclipse A/T
SUBJECT:
POOR A/T SHIFT QUALITY (1996-97 MODELS)
This bulletin supercedes TSB-98-23-003, issued April, 1998, to correct the EATX III/Engine harness switch setting for reprogramming the TCU.
PURPOSE
The following possible shift concerns can be corrected by reprogramming the transmission control unit (TCU) with new software contained in
reprogramming cartridge MIT992014 as described in this bulletin.
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When the gear shifter is moved between the forward gears (D, 2, L), the transaxle stays in the original gear.
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DTCs 21-27, 31-33 and/or 50-58 may be set. The transaxle may enter limp-in mode (stays in 2nd gear) if any of these DTCs are set.
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Vehicle starts up in second gear and does not shift until after driving for a few minutes. DTC 74 (Calculated Oil Temperature in Use) may set. This
condition is due to the thermistor circuit sending false temperature signals to the TCU, resulting in the TCU changing the shift schedule. The new
TCU software in reprogramming cartridge MIT992014 will cause the TCU to check other temperature readings to verify whether the thermistor
circuit signal is correct before changing the shift schedule.
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Delayed upshifts when driving uphill.
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Poor mid-throttle shift performance on 1996 models.
AFFECTED VEHICLES
1996-97 Eclipse 2.0L DOHC non-turbocharged automatic transmission models
PROCEDURE
1.
Using the MUT-II scan tool, check to see if any DTCs other than DTC 21-27, 31-33 and/or 50-58 are set. If necessary, perform the appropriate
troubleshooting steps and repairs described in Group 23A in the service manual. Then go to Step 2 for TCU reprogramming instructions.
2.
Gather the following equipment which is contained in Reprogramming Kit MIT992000-A:
Do not install the cartridge into the Reprogramming Unit at this time.
3.
Attach the EATX III/Engine harness to the Reprogramming Unit. Refer to page 6 of the Reprogramming Unit Instruction Manual.
