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No Response From Transmission Control Module (4.7L)

Possible Causes:

CAUTION: Always turn ignition off before disconnecting or connecting any control module connector. Failure to do so could result in damage to control module.
NOTE: Ensure vehicle being tested has a fully charged battery. If it does not, false symptoms may occur.
NOTE: For component location, see appropriate illustration under COMPONENT LOCATIONS  . For terminal identification, see appropriate illustration under CONNECTOR IDENTIFICATION  . For circuit and wire color identification, see WIRING DIAGRAMS  . For component removal and installation procedures, see appropriate component under REMOVAL & INSTALLATION  .

Testing:

  1. Turn ignition off. Connect DRBIII(R) to DLC. Turn ignition on. Select BODY, then BODY COMPUTER. Using the DRBIII(R), attempt to communicate with the ACM and the CTM. As soon as one or more modules communicates with the DRBIII(R), answer the question. Is DRBIII(R) able to identify or communicate with either the ACM or CTM? If yes, go to next step. If no, see PCI BUS COMMUNICATION FAILURE  .
  2. Turn ignition off (Lock position). Disconnect TCM Harness connector. Turn ignition on. Using a 12-volt test light connected to ground, probe TCM harness connector terminal No. 11. Does test light illuminate brightly? If yes, go to next step. If no, repair open in Fused Ignition Switch Output (Run/Start) circuit. Perform TRANSMISSION VERIFICATION TEST  under VERIFICATION TESTS.
  3. Turn ignition off. Remove Starter Relay from the PDC. Using 12-volt test light connected to ground, probe Starter Relay terminal No. 86. Observe the test light while momentarily turning ignition switch to START position. Does test light illuminate brightly? If yes, go to next step. If no, repair open in Fused Ignition Switch Output (Start) circuit. Perform TRANSMISSION VERIFICATION TEST  under VERIFICATION TESTS.
  4. Turn ignition off. Using 12-volt test light connected to ground, probe TCM harness connector terminal No. 56. Does test light illuminate brightly? If yes, go to next step. If no, repair open in Fused B+ circuit. Perform TRANSMISSION VERIFICATION TEST  under VERIFICATION TESTS.
  5. Using 12-volt test light connected to 12 volts, probe TCM harness connector terminals No 37, 39, 53 and 57. Does test light illuminate brightly on all circuits? If yes, go to next step. If no, repair open in Ground circuit(s). Perform TRANSMISSION VERIFICATION TEST  under VERIFICATION TESTS.
    6. NOTE: Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If not, see PCI BUS COMMUNICATION FAILURE  .
  6. Connect Scope Input Cable (CH7058) to channel one connector on DRBIII(R). Connect Cable-To-Probe Adapter (CH7062) and Black and Red test probes to scope input cable. Using the DRBIII(R), select PEP MODULE TOOLS, LAB SCOPE, LIVE DATA and 12 VOLT SQUARE WAVE. Press F2 for SCOPE. Press F2 and use DOWN arrow to set voltage scale to 20 volts. Set probe to x10. Press F2 again when complete. Connect Black test probe to ground. Connect Red test probe to TCM harness connector terminal No. 43. Turn ignition on. Observe DRBIII(R) lab scope. Does voltage toggle from zero to approximately 7.5 volts? See Figure -Figure . If yes, go to next step. If no, repair open in PCI Bus circuit. Perform TRANSMISSION VERIFICATION TEST  under VERIFICATION TESTS.
  7. If there are no possible causes remaining, replace TCM. Perform TRANSMISSION VERIFICATION TEST  under VERIFICATION TESTS.
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