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DTC P0743: Torque Converter Clutch Solenoid/Trans Relay Circuits (3SP Auto Trans): Testing

  1. Turn ignition on. Using scan tool, check for DTCs. If Good Trip counter is displayed for DTC P0743 and displayed count is "0", go to next step. If Good Trip counter is not displayed for DTC P0743 or displayed count is not "0", go to step  8.
  2. Turn ignition off. Disconnect TCC solenoid connector. TCC solenoid is located near front of transaxle. Turn ignition on. Turn all accessories off. Connect a test light between TCC solenoid harness connector terminals. Using scan tool, actuate TCC solenoid. If test light flashes on and off, replace TCC solenoid. If test light does not flash on and off, disconnect test light and go to next step.
  3. Using test light connected to ground, probe Pink/Gray wire at TCC solenoid harness connector. If test light illuminates, disconnect test light and go to next step. If test light does not illuminate, repair open in fused ignition switch output circuit (Pink/Gray wire) to TCC solenoid.
  4. Measure voltage between ground and Dark Blue/White wire at TCC solenoid harness connector. If voltage is .5 volt or less, go to next step. If voltage is more than .5 volt, repair short to voltage in Dark Blue/White wire between TCC and PCM.
  5. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, in front of battery. Measure resistance between ground and Dark Blue/White wire at TCC harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/White wire between TCC solenoid and PCM.
  6. Measure resistance of Dark Blue/White wire between TCC harness connector and terminal No. 78 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/White wire.
  7. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  8. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.
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