Download SYMPTOM The vehicle shudders or vibrates between 35 and 40 mph. PROBABLE CAUSE The torque converter is faulty. CORRECTIVE ACTION Replace the torque converter, or the torque converter and the transmission, and update the PCM with the HDS. NOTE: You must update the PCM to complete the repair. PARTS INFORMATION Torque Converter: P/N 26000-RDJ-315. DIAGNOSIS 1. To confirm the client’s complaint, test-drive the vehicle on a smooth road, preferably with a slight incline. Set the cruise control between 35 and 40 mph, and monitor the engine rpm using the vehicle’s tachometer, or use the HDS to take a snapshot of the engine rpm. 2. If the engine speed fluctuates several hundred rpm while maintaining a constant vehicle speed, disconnect the EGR valve and retest the vehicle. •If the fluctuation is gone, refer to the EGR troubleshooting in the service manual. •If the engine rpm still fluctuates, and the transmission does not have any other symptoms (shifting problems, slipping, transmission DTCs) go to step 3. 3. Drain the transmission fluid, then strain it through a paint strainer. •If you find little or no contamination in the strainer, the ATF is OK, even if it smells burnt, is discolored, and/or the magnetic drain plug has small chips, flakes, or metal fuzz on it. Go to REPAIR PROCEDURE A . •If you find large amounts of contamination (pieces of metal or friction material) in the strainer, go to REPAIR PROCEDURE B . REPAIR PROCEDURE A 1. Remove the torque converter: •Refer to page 14-203 of the 2003-04 MDX Service Manual , or •Online, enter keyword A/T REM , and select A/T Removal from the list. 2. Install the torque converter: •Refer to page 14-215 of the 2003-04 MDX Service Manual , or •Online, enter keyword A/T INSTALL , and select A/T Installation from the list. 3. Update the PGM-FI software using HDS version 1.018.016 or later (see SOFTWARE INFORMATION ). Refer to service bulletin 01-026, Updating the ECM/PCM .
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