TCU Code 45 And AWD Harsh Engagement (16-66-02)
Publication date: 2003-03-15Reference number: 16-66-02
TCU CODE 45 AND AWD HARSH ENGAGEMENT
TECHNICAL SERVICE BULLETIN
| SUBARU: | 1999-02 All Models |
| APPLIES TO: | 1999-02 All Models |
INTRODUCTION
If you encounter a TCU Code 45 (intake manifold pressure signal), and have confirmed the wiring and connectors as outlined in the appropriate Service Manual, it will be necessary to replace the TCU with one listed below. Please note that if the same vehicle is experiencing an ECM code for the pressure signal, replacement of the TCU will not correct it. You will need to diagnose and repair according to the Service Manual.
These new TCUs also include a slight logic change to address AWD harsh engagement. Some customers may comment, when they are driving in snow and ice and they try to accelerate during slow speed driving, that they feel a bang from the rear of the vehicle. This is caused by the transfer clutch being applied quickly when the system detects slight wheel slippage. You should confirm the AWD is working properly prior to replacing the TCU.
These logic changes were incorporated into production from the start of 2003 model year.
| LEGACY | TCU | ||
|---|---|---|---|
| 99MY | 2.2L | LHDCAL | 31711AE154 |
| POSTAL CAL | 31711AE164 | ||
| LHDFED | 31711AE404 | ||
| POSTAL FED | 31711AE414 | ||
| 2.5L | GT | 31711AE174 | |
| OBK | 31711AE184 | ||
| OOMY | 2.5L | L | 31711AE10C |
| GT | 31711AE11C | ||
| 2.5L | OBK | 31711AE12C | |
| 01 MY | 2.5L | L | 31711AF33C |
| GT | 31711AF34C | ||
| 2.5L | OBK | 31711AF35C | |
| 3.0L | OBK | 31711AF37B | |
| 02MY | 2.5L | L | 31711AF90B |
| GT | 31711AF91B | ||
| 2.5L | OBK | 31711AF92B | |
| 3.0L | OBK | 31711AF95B | |
| IMPREZA | TCU | |||
|---|---|---|---|---|
| 99MY | 2.2L | CAL | 31711AE314 | |
| FED | 31711AE424 | |||
| 2.5L | 31711AE324 | |||
| 00- | 2.2L | 31711AE532 | ||
| 01 MY | 2.5L | 31711AE552 | ||
| 02MY | 2.5L | TS.OBK | 31711AE951 | |
| RS | 31711AE961 | |||
| FORESTER | TCU | |
|---|---|---|
| 99MY | 2.5L | 31711AE234 |
| 00-01 MY | 2.5L | 31711AE672 |
| 02MY | 2.5L | 31711AF491 |
Subaru Service Bulletins are intended for use by professional technicians ONLY. They are written to inform those technicians of conditions that may occur in some vehicles, or to provide information that could assist in the proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do the job correctly and safely. If a condition is described, DO NOT assume that this Service Bulletin applies to your vehicle, or that your vehicle will have that condition.