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No Response From TCM

NOTE: After making any repairs, perform TRANSMISSION VERIFICATION TEST under VERIFICATION TESTS unless instructed otherwise in following steps.
  1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). DLC is located on bottom of instrument panel, to right of brake pedal. See Figure. Turn ignition on. Using scan tool, attempt to communicate with PCM. If PCM communicates, go to next step. If PCM does not communicate, perform NO RESPONSE FROM PCM (SCI ONLY) test under STARTING under SELF-DIAGNOSTICS - PT CRUISER article in ENGINE PERFORMANCE.
  2. Using scan tool, attempt to communicate with TCM. If scan tool displays NO RESPONSE to TCM, go to next step. If scan tool communicates with TCM, test is complete.
  3. Using scan tool, check all other modules for communication problems. Verify any customer complaints related to intermittent bus problems. Check PRNDL display for NO BUS message. If no problem is found, go to next step. If any problem is found, diagnose and repair as necessary.
  4. Turn ignition off. Disconnect Black 60-pin TCM harness connector. See Figure. Check, clean and repair connectors as necessary. Connect 12-volt test light between TCM harness connector terminal No. 56, fused battery feed circuit (Red/White wire) and ground. If test light illuminates brightly, leave TCM connectors disconnected and go to next step. If test light does not illuminate brightly, repair Red/White wire for open or high resistance.
  5. Turn ignition on. Connect 12-volt test light between TCM harness connector terminal No. 11, fused ignition switch start/run output circuit (Light Green/White wire) and ground. If test light illuminates brightly, leave TCM connectors disconnected and go to next step. If test light does not illuminate brightly, repair Light Green/White wire for open or high resistance.
  6. Turn ignition off. Remove STARTER relay from cavity "B" in PDC. See Figure. Connect 12-volt test light between TCM harness connector terminal No. 8, fused ignition switch start output circuit (Yellow wire) and ground. Turn ignition switch to START position. If test light illuminates brightly, leave PCM connectors disconnected and go to next step. If test light does not illuminate brightly, repair Yellow wire for open or high resistance.
  7. Install STARTER relay. Connect 12-volt test light between battery voltage and TCM harness connector terminal No. 53, ground circuit (Black/Yellow wire) and terminal No. 57, ground circuit (Black/Red wire) one at a time. If test light illuminates brightly at both ground circuit terminals, go to next step. If test light does not illuminate brightly at any ground circuit terminal, repair wire(s) for open or high resistance.
  8. Turn ignition off. Connect scan tool to Data Link Connector (DLC). DLC is located on bottom of instrument panel, to left of brake pedal. See Figure. Turn ignition on. Using scan tool, attempt to communicate with other modules. If scan tool does not communicate with other modules, proceed to NO RESPONSE FROM PCI (PCI BUS)  test. If scan tool communicates with other modules, go to next step.
  9. Connect Scope Input Cable (CH7058) to channel one connector on scan tool. Connect Red and Black leads, and Cable-to-Probe Adapter (CH7062) to scope input cable. Using scan tool, select DRB STANDALONE, LAB SCOPE, LIVE, then 12-VOLT SQUARE WAVE. Press F2 for scope. Press F2 again and use down arrow to set voltage range to 20 volts. Press F2 again. Connect Black lead to ground. Connect Red lead to TCM harness connector terminal No. 43, PCI bus circuit (Violet/Yellow wire). Turn ignition on. Observe voltage display on scan tool lab scope. If voltage pulses from zero to about 7.5 volts, go to next step. If voltage remains at zero volts, repair open Violet/Yellow wire.
  10. Turn ignition off. Remove scan tool. Using an ohmmeter, check resistance between TCM harness connector terminal No. 43 and DLC terminal No. 2 PCI bus circuit (Violet/Yellow wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms, or more, repair Violet/Yellow wire.
  11. Replace TCM. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION.
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