EATX PRNDL Message Test Failed; No Response From TCM
NOTE:
Perform body verification test after each repair. See BODY VERIFICATION TEST under VERIFICATION TESTS.
CAUTION:
Always turn ignition off prior to disconnecting any module connector.
- Disconnect Transmission Control Module (TCM). TCM is located next to power distribution center in left front corner of engine compartment. Turn ignition on. Connect a jumper wire between ground and TCM connector terminal No. 43 (Violet/Dark Green wire). See Fig 1. Using scan tool, select BODY, BODY COMPUTER, SYSTEM TEST and perform CCD BUS test. If scan tool displays BUS SHORT TO GROUND, go to next step. If scan tool does not display BUS SHORT TO GROUND, go to step 4.
- Move jumper wire to terminal No. 4 (White/Dark Green wire). Using scan tool, 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. See TRANSMISSION CONTROL MODULE (TCM) under REMOVAL & INSTALLATION.
- Connect a jumper wire to ground and backprobe Body Control Module (BCM) 14-pin connector C1 terminal No. 14 (White/Dark Green wire). See CONNECTOR IDENTIFICATION . Using scan tool, perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, replace BCM. See BODY CONTROL MODULE (BCM) under REMOVAL & INSTALLATION. If scan tool displays BUS SHORT TO GROUND, repair open in White/Dark Green wire.
- Connect a jumper wire between ground and Body Control Module (BCM) 14-pin connector C1 terminal No. 6 (Violet/Dark Green wire). See CONNECTOR IDENTIFICATION . Using scan tool, perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, replace BCM. See BODY CONTROL MODULE (BCM) under REMOVAL & INSTALLATION. If scan tool displays BUS SHORT TO GROUND, repair open in Violet/Dark Green wire.