Diagnostic Information for Alleged Chain Slip Condition on TR580 / TR690 Transmissions – 2017-2023 Subaru

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Continued… CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS. 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. Subaru of America, Inc. is ISO 14001 Compliant ISO 14001 is the international standard for excellence in Environmental Management Systems. Please recycle or dispose of automotive products in a manner that is friendly to our environment and in accordance with all local, state and federal laws and regulations. NUMBER: 16-132-20R DATE: 12/18/20 REVISED: 06/28/23 APPLICABILITY: 2018-23MY Legacy and Outback 2017-23MY Impreza 2018-23MY Crosstrek 2019-23MY Forester 2019-23MY Ascent SUBJECT: Diagnostic Information for Alleged Chain Slip Condition on TR580 / TR690 Transmissions INTRODUCTION: This Service Information Bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions used in the models listed above. In some cases, the customer may have had a concern of hearing an abnormal sound and / or felt an unusual vibration while driving. This information is intended to provide Technicians a user-friendly procedure which will help to ensure an accurate diagnosis and reduce the possibility of unnecessary CVT replacements. SERVICE PROCEDURE / INFORMATION: Customer satisfaction and retention starts with performing quality repairs. After completing the questionnaire located at the end of the Troubleshooting section, following the diagnostic procedures supplied in this bulletin and when determined necessary, service procedures for CVT and / or TCM replacement remain unchanged. Always refer to the applicable Service Manual and review the full requirements of the repair being performed. The Service Manual procedures contain information critical to performing an effective repair the first time, every time. This includes but is not limited to important SAFETY precautions, proper inspection criteria, necessary special tools, required processes and related one-time-use parts needed for a complete and lasting repair. VERY IMPORTANT: With any customer concern, it is important to get a complete and detailed description from them so their condition can be duplicated. Duplicating the condition is critical for a proper diagnosis and successful repair. Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 1 of 12 SERVICE INFORMATION BULLETIN ATTENTION: GENERAL MANAGER q PARTS MANAGER q CLAIMS PERSONNEL q SERVICE MANAGER q IMPORTANT – All Service Personnel Should Read and Initial in the boxes provided, right. ©2020 Subaru of America, Inc. All rights reserved. Continued… Please refer to the table below as it outlines cases where submitting a Quality Monitoring Report (QMR) is required when replacing the CVT. Ensure that all the necessary diagnostic requirements and results, as listed in this bulletin, are included with each QMR submission. It is important to note that the table and data requirements will change periodically, so always refer to the latest revision of this bulletin with each CVT diagnosis. Coding for claim submission on vehicles requiring QMR submission (shown in the table below) is outlined on pg. 10 and 11 of this bulletin. DSQMs and DPSMs may at their discretion as District Managers, require retailer QMR submission for CVT repair or replacement pre-authorizations. In these cases, the appropriate labor time supplied from the coding information on pg. 10 and 11 can be added to the claim which DPSM/DSQM can authorize. Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 2 of 12 Continued… Troubleshooting Flow Chart for Alleged CVT Chain Slip: -Create a QMR/TechShare* if th*e vehicle characteristics are found to be “Currently Normal” when troubleshooting. -Replace CVT -Report results with QMR/Techshare*** -Reprogram TCM if applicable ***NOTE: Submit complete questionnaire & TCM SSM data recorded during test drive. #10 Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 3 of 12 Continued… PAK FILE INFORMATION: IMPORTANT NOTES: • When performing and CVT replacement or TCU reprogramming, always confirm the fault has been corrected. • When submitting TechShare/QMR reports, include the TSB number of this document (16- 132-20R) as a keyword. This is used to manage cases. If the vehicle being repaired is not listed in the table below, or if the reprogramming file listed in the table below is already installed , proceed to the next Step in diagnosis procedure. The reprogramming file may be further updated in the future. Always refer to the most current revisions. Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 4 of 12 Model MY File name Specification Old Part Number Keyword New CID ASCENT 19 30919AF98G.pak 2.4L DIT CVT without CVTF cooler (air cool) 30919AF98E 30919AF98F 6CB17BE5 R83EE000 19 30919AF99G.pak 2.4L DIT CVT with CVTF cooler (air cool) 30919AF99E 30919AF99F 1648933C R83EF000 20-21 30919AH13H.pk2 2.4L DIT CVT without CVTF cooler (air cool) 30919AH13F 30919AH13G B3DFD2E3 Q93EE100 20-21 30919AH14H.pk2 2.4L DIT CVT with CVTF cooler (air cool) 30919AH14E* 30919AH14G B5D0FB3D Q93EF100 22 30919AJ53B.pk2 2.4L DIT CVT without CVTF cooler (air cool) 30919AJ53A D3DF9A7B N2FEE600 22 30919AJ54B.pk2 2.4L DIT CVT with CVTF cooler (air cool) 30919AJ54A CED94BB7 N2FEF600 * A TCM with software version 30919AH14E as the current software status will require an additional step when reprograming. Until further revision is announced, the Temporary PAK file used in WRK- 21/22 MUST be reprogrammed to the TCM before the 30919AH14H file can be installed. NOTE: The temporary reprogramming files used in WRK-21/22 are not to be used for CVT chain slip diagnosis on vehicles currently unaffected by WRK-21/22. CVT Chain Slip Assessment: There are three main forms of CVT chain slip. • Continuous Micro-Slip • Short-Time Slip • Long-Time Slip Using Subaru Select Monitor (SSM), check and record data monitors and compare to the three examples listed below. If the recorded data from the vehicle matches the examples below, the CVT will require replacement. The SSM data will be required for claim submission. A QMR containing the same information will also be required. 1. Continuous Micro-Slip: During a continuous micro-slip, while the Accelerator Opening Angle monitor displays a stable value for more than one second, there are fluctuations in the Actual Gear Ratio monitor: Peak to Peak > 0.02 Frequency > 3 cycles per 1 second There are fluctuations in the Primary Rev Speed and/or Secondary Rev Speed monitor: Peak to Peak > 50 rpm Frequency > 3 cycles per 1 second Continued… Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 5 of 12 Continued… Below are two examples of the data monitoring during Continuous Micro-Slip 2. Short-Time Slip: When a short-time slip occurs, the changes in the Actual Gear Ratio monitor will be larger than 0.1 per 0.1 second. After the Actual Gear Ratio monitor resumes to stable conditions, distinct fluctuations in revolution speed continues. Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 6 of 12 Continued… 3. Long-Time Slip: When a long-time slip occurs, the Primary UP Duty monitor will be larger than 90% and the Actual Pulley Ratio monitor lowers for a duration of 0.5 seconds or more. Even after the Actual Gear Ratio monitor resumes to stable conditions, distinct fluctuations in revolution speed continues. Reference Material: Similar Symptoms To CVT Chain Slip In some cases, a customer may report symptoms of chain slip when in fact there is no actual slippage within the CVT. Listed below are examples of situations than can mimic the symptoms of chain slip. 1. Forward Clutch Slip Shock: This shock can occur when the forward clutch slips. If this situation is reported, reprogram the TCM with new software if it is available. The rotation speeds for the upstream and downstream sides of the forward clutch do not synchronize when driving. Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 7 of 12 Example for vehicles WITHOUT 2.4L Turbo or 3.6L NA Upstream side of the forward clutch- Turbine Revolution Speed Downstream side of the forward clutch- Primary Rev Speed Example for 2.4L Turbo or 3.6L NA equipped vehicles Upstream side of the forward clutch- Secondary Rev Speed Downstream side of the forward clutch- Front Wheel Speed Continued… Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 8 of 12 2. Lock Up Clutch Engagement Shock: This shock can occur when the lock up clutch engages rapidly. If this situation is reported, reprogram the TCM with new software if it is available. 3. Shift Up Shock: This shock can occur when the CVT upshifts. If this situation is reported, reprogram the TCM with new software if it is available. If there is no new software available or the reprograming does not remedy the issue, report the situation to Techline. Continued… Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 9 of 12 4. Primary Up Duty Square Control (Ascent Models up to 2021MY): A harsh shift can be felt while driving. If this situation is reported, reprogram the TCM with new software if it is available. If there is no new software available or the reprograming does not remedy the issue, report the situation to Techline. WARRANTY / CLAIM INFORMATION: NOTE: ALWAYS confirm and verify the specific vehicle Warranty coverage prior to performing any work to the vehicle. For vehicles within the Basic New Car Limited Warranty period Powertrain Limited Warranty or covered by an active Subaru Added Security Powertrain, Classic or Gold plan, this repair may be submitted using the following claim information: Labor Description Labor Operation # Labor Time Fail Code QUESTIONNAIRE, DTC DIAG = CURRENTLY NORMAL & QMR A303-720 0.8H MKO-98 *QUESTIONNAIRE, SSM TEST DRIVE W/ CHAIN SLIP DETECTED & QMR C303-716 0.7H TMA | TMB | MQJ **QUESTIONNAIRE, SSM TEST DRIVE NO CHAIN SLIP & NO FAULT AFTER TCM UPDATE C303-728 0.5H MJZ-48 QUESTIONNAIRE, SSM TEST DRIVE NO CHAIN SLIP, CURRENT FAULT & QMR A303-722 0.9H MKO-98 *To be claimed in conjunction with CVT repair coding from LTG as a dependent operation. ** To be claimed in conjunction with TCM update B860-737 when applicable. Continued… Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 10 of 12 Continued… IMPORTANT REMINDERS: • SOA strongly discourages the printing and/or local storage of service information as previously released information and electronic publications may be updated at any time. • Always check for any open recalls or campaigns anytime a vehicle is in for servicing. • Always refer to STIS for the latest service information before performing any repairs. Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 11 of 12 Questionnaire for Alleged CVT Chain Slip Condition Please use all applicable check boxes. Please enter a number value in vehicle speed box. Please attach SSM data files for both before and after pre- and post-repair. No. Item Answer 1 Condition: CVT Temperature Immediately after starting the engine Warming-up After warming-up 2 Location Highway Paved-road Rough-road 3 Vehicle Speed mph 4 Driving Condition While accelerating While decelerating While cruising While turning 5 Vehicle Used for Towing? Yes No 6 Frequency of Slip Condition Only once A few times Intermittent Always 7 How Long Has Condition Been Occurring? It just started Within the last month From new 8 Symptoms: Noise Vibration Shock/Bump Hesitation/Surge Shudder Jerking/Bucking Engine RPM rise/flare Lack of power / not accelerate Deceleration feeling Engine RPM not rise Engine RPM fluctuation / hunting gear Other (please describe:) 9 Repair(s): T/M assy replacement T/M part(s) replacement TCM Re-programing AT relearn / torque converter relearn No repair made (inspection only) Other (please describe:) 10 Customer Comments Post-Repair: Example: Satisfaction / dissatisfaction level, further improvement requirements. Bulletin Number: 16-132-20R; Revised: 06/28/23 Page 12 of 12

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