I was told its code P0743

ROBMON2

MEMBER
2001 DODGE NEON

Transmission problem
2001 Dodge Neon 4 cyl Automatic 91,000 miles

As l press down on the acceleration and once between 25 and 40 mph the car will go into a jerking battle until reaching pass 40 mph where it smoothing throughout the rest of the acceleration period. Ever since having the car (9 months) it seem to idle high like its taking a little to much gas before it finally switch gears which it does fine except between 25 - 40 mph. This happens every time but l can somewhat surpass this stage if I really press down on the acceleration.

The engine check light has been on ever since this problem occurred I was told its code P0743. I seriously need professional advice on this problem I have been told I need to replace the torque converter, the torque switch, some just say its an computer problem please help. I also have the starter, alternator and battery check out which is all fine.

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

P0743: TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT
Circuit Description

P0743 will set if an open or short is detected in TCC solenoid control circuit.
Possible Cause

P0743 can be caused by the following:
Open in fused ignition switch output circuit.
Faulty TCC solenoid.
Faulty TCC solenoid wire harness.
Open TCC solenoid control circuit.
Short to ground in TCC solenoid control circuit.
Faulty PCM.

Diagnostic Procedure

1. Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP is displayed and is equal to zero, go to next step. If GLOBAL GOOD TRIP is not displayed or is not equal to zero, go to step 8.

2. Turn ignition off. Disconnect TCC solenoid harness connector. Turn ignition on. Using test light connected to fused ignition switch output circuit at TCC solenoid harness connector, probe TCC solenoid control circuit. See WIRING DIAGRAMS. Using scan tool, activate TCC solenoid. If test light flashes on and off, replace TCC solenoid. If test light does not flash on and off, go to next step.

3. Using test light connected to ground, probe fused ignition switch output circuit at TCC solenoid harness connector. If test light is illuminated, go to next step. If test light is not illuminated, repair high resistance or open circuit.

4. Ensure ignition is on. Measure voltage between ground and TCC solenoid control circuit terminal on TCC solenoid connector. If voltage is greater than.5 volt, repair TCC solenoid control circuit for short to voltage. If voltage is.5 volt or less, go to next step.

5. Turn ignition off. Disconnect PCM harness connectors. Measure resistance between ground and TCC solenoid control circuit at appropriate PCM harness connector. See WIRING DIAGRAMS. If resistance is less than 5 ohms, repair circuit for short to ground. If resistance is 5 ohms or more, go to next step.

6. Measure resistance of TCC solenoid control circuit between TCC solenoid connector and appropriate PCM harness connector. If resistance is less than 5 ohms, go to step 8. If resistance is 5 ohms or more, repair open circuit.

7. If no potential causes for failure remain, PCM is assumed to be faulty. Repair as necessary. Help duplicate conditions that set DTC. Using scan tool, check for engine-related DTCs such as VSS, MAP, ECT and load DTCs. Repair all engine-related DTCs prior to diagnosing transmission malfunction. Visually inspect related wiring harness. Look for chafed, pierced, pinched or partially broken wires. Check related wiring harness connectors for broken, bent pushed out or corroded terminals. Refer to any Technical Service Bulletins (TSB) that may apply. Repair as necessary. If no problems are found, test is complete.