TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-2320-387-24-1 4-74 Change 1 4-45. TRANSMISSION CONTROL MODULE (TCM) REPLACEMENT This task covers: a. Removal b. Installation CAUTION Ensure ignition switch is OFF before disconnecting or recon- necting Transmission Control Module (TCM). Failure to do this may cause internal damage to TCM. NOTE • Perform step 1 to remove left rear passenger seat (M1114 only). • Perform step 1.1 for TCM access M1113 only. • For E-Prom replacement, perform steps 1.2 through 4 only. For TCM replacement, perform steps 5 and 6 only. 1. Remove four socket-head screws (16), lockwashers (17), washers (18), and seat base (19) with seat (15) from floor (14). Discard lockwashers (17). 1.1. Open and secure left rear access panel (6.2). 1.2. Loosen four screws (1) and remove cover (2) and foam insulation (4) from TCM (8). 2. Remove two screws (5) and access panel (6) from terminal box (9). 3. Remove E-Prom (6.1) from circuit board (7). 4. Clean sealant from TCM (8) and cover (2). 5. Disconnect harness connector (11) from TCM (8). 6. Remove four screws (12), washers (13), and TCM (8) from floor (14). NOTE • For TCM installation, perform steps 1 and 2 only. For E-Prom replacement, perform steps 3 through 6 only. • Perform step 7 for M1113 only and step 8 to install left rear passenger seat (M1114 only). 1. Install TCM (8) on floor (14) with four washers (13) and screws (12). 2. Connect harness connector (11) to TCM (8). 3. Install E-Prom (10) on circuit board (7). 4. Install access panel (6) on terminal box (9) with two screws (5). 5. Apply 1/8-in. bead of RTV adhesive sealant in groove (3) on cover (2). 6. Install foam insulation (4) and cover (2) on TCM (8) and tighten four screws (1) to 30 lb-in. (3 N•m). 7. Close and secure left rear access panel (6.2). 8. Install seat base (19) with seat (15) on floor (14) with four washers (18), lockwashers (17), and socket-head screws (16). Tighten socket-head screws (16) to 140-170 lb-in. (16-19 N•m). b. Installation a. Removal INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Maintenance and repair shop equipment: automotive (Appendix B, Item 2) Materials/Parts Adhesive (Appendix C, Item 10) Four lockwashers (Appendix G, Item 204) Personnel Required One mechanic One assistant Manual References TM 9-2320-387-24P Equipment Condition Battery ground cables disconnected (para. 4-68). Maintenance Level Unit