Test 14A - No Response From Transmission Control Module
NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION
and WIRING DIAGRAMS
. Perform TEST VER-1A - VERIFICATION PROCEDURE
after each repair.
CAUTION:
Always turn ignition off prior to disconnecting any module connector.
- Determine if transmission is operating correctly before proceeding with following testing. See appropriate article in the AUTOMATIC TRANSMISSION section.
- Disconnect Transmission Control Module (TCM). TCM is located at left fenderwell, next to power distribution center. Turn ignition on. Connect jumper wire between ground and TCM connector, terminal No. 43 (Violet/Dark Green wire).
- Using scan tool, select BODY, BODY COMPUTER, then SYSTEM TEST. Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, go to step 6). If scan tool displays BUS SHORT TO GROUND, go to next step.
- Move jumper wire to terminal No. 4 (White/Dark Green wire). Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, go to next step. If scan tool displays BUS SHORT TO GROUND, replace TCM.
- Connect jumper wire to ground and backprobe Body Control Module (BCM) 14-pin connector, terminal No. 14 (White/Dark Green wire). Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, replace BCM. If scan tool displays BUS SHORT TO GROUND, repair open White/Dark Green wire.
- Connect jumper wire between ground and Body Control Module (BCM) 14-pin connector, terminal No. 6 (Violet/Dark Green wire). Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, replace BCM. If scan tool displays BUS SHORT TO GROUND, repair open Violet/Dark Green wire.