I need the torque converter lock up diagram and which pins are hot and ground on the transmission plug for 1985 4x4 k 10.

P0741 Torque Converter Clutch Circuit Performance or Stuck Off OBD-II Trouble Code Technical Description Article by Dan Weller ASE Certified Master Technician Torque Converter Clutch Circuit Performance or Stuck Off This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model. What does that mean? Modern vehicles equipped with automatic transmissions / transaxles use a torque converter between the engine and transmission to increase the engine torque output and drive the rear wheels. The engine and transmission are actually connected by a fluid coupling mechanism inside of the torque converter which is what multiplies the torque until the speeds equalize and create a "stall" speed where the difference in actual engine RPM and transmission input RPM is around 90% efficient. Torque converter clutch (TCC) solenoids commanded by the Powertrain control module/Engine control module (PCM/ECM) or the Transmission control module (TCM) to direct hydraulic fluid and engage the torque converter clutch to create a solid coupling and increase efficiency. The transmission control module has detected a fault with the circuit that operates the torque converter clutch solenoid. Note: This code is similar to codes P0740, P0742, P0743 and P0744. There may be other diagnostic trouble codes associated with the transmission control module that can only be accessed by using an advanced scan tool. If any additional transmission related DTC's appear in addition to the P0741, an electrical failure is likely. Symptoms Symptoms of a P0741 trouble code may include: Performance or Stuck Off Indicator Lamp (MIL) illuminated (a.k.a. Check Engine Light) Minimal decrease in fuel economy, this will not affect engine performance Potential Causes Causes of this DTC may include: Wiring harness to transmission shorted to ground Torque converter clutch (TCC) solenoid internal short Transmission control module (TCM) Diagnostic Steps for P0741 DTC Wiring harness - Check transmission wiring harness for damage or loose connections. Use a factory wiring diagram to locate the appropriate power source and all connection points between circuits. The transmission may be powered by a fuse or relay, and triggered by the TCM. Disconnect the transmission harness at the transmission connector, power source and TCM. Check for a short to ground inside the transmission internal wiring harness by locating the appropriate + and - pins for the torque converter clutch solenoid. Using a digital volt ohm meter (DVOM) set to ohms scale, check for a short to ground in the circuit with the positive lead on either pin and the negative lead to a known good ground. If resistance is low, suspect a short to ground the internal harness or the TCC solenoid - removing the transmission oil pan may be necessary to further diagnose the TCC solenoid. Test the wiring between the TCM and the wiring harness connector at the transmission case using the DVOM set to ohms. Check for a possible short to ground by moving the negative lead on the DVOM to a known good ground, resistance should be very high or over limit (OL). Torque converter clutch (TCC) solenoid - Check the resistance in the TCC solenoid and internal transmission wiring at the transmission case after removing the transmission harness plug (if applicable, some makes/models use a TCM bolted directly to the transmission case). Some makes/models use a transmission wire harness with the TCC solenoid and internal harness as a single unit. Using the DVOM set to ohms, check for a short to ground with the positive lead on either circit to the TCC and the negative lead on a known good ground. Resistance should be very high or over limit (OL), if it is low, suspect a short to ground. Check for voltage on the power side circuit of the TCC solenoid or at the wire harness connector at the TCM with the DVOM set to volts scale, positive lead at the wire being tested and the negative to a known good ground with the vehicles key on/engine off, battery voltage should be present. If no voltage is present, determine the loss of power back through the circuit using the manufacturers wiring diagrams for reference. Transmission control module (TCM) - Since the torque converter clutch is only activated during certain driving conditions, it will be necessary to monitor the TCM with an advanced scan tool to determine if the TCM is commanding the TCC solenoid and what the actual feedback reading is at the TCM. The TCC solenoid is normally controlled by a duty cycle to engage a more comfortable torque converter cluch engagement. To test if the TCM is actually sending the signal, a graphing multimeter set to duty cycle or a digital storage oscilloscope will be required as well. The positive lead is probed into the wiring harness plugged into the TCM and the negative lead to a known good ground. The duty cycle shold be the same as being commanded by the TCM in the advanced scan tool reading. If the cycle stays at 0% or 100% or is intermittent, re-check connections and if all wiring / solenoid is OK, the TCM may be at fault.

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P0744 Torque Converter Clutch Circuit Intermittent OBD-II Trouble Code Technical Description Article by Dan Weller ASE Certified Master Technician Torque Converter Clutch Circuit Intermittent This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model. What does that mean? Modern vehicles equipped with automatic transmissions / transaxles use a torque converter between the engine and transmission to increase the engine torque output and drive the rear wheels. The engine and transmission are actually connected by a fluid coupling mechanism inside of the torque converter which is what multiplies the torque until the speeds equalize and create a "stall" speed where the difference in actual engine RPM and transmission input RPM is around 90% efficient. Torque converter clutch (TCC) solenoids commanded by the Powertrain control module/Engine control module (PCM/ECM) or the Transmission control module (TCM) to direct hydraulic fluid and engage the torque converter clutch to create a solid coupling and increase efficiency. The transmission control module has detected a fault with the circuit that operates the torque converter clutch solenoid. Note: This code is similar to codes P0740, P0741, P0742 and P0743. There may be other diagnostic trouble codes associated with the transmission control module that can only be accessed by using an advanced scan tool. If any additional transmission related DTC's appear in addition to the P0744, an electrical failure is likely. Symptoms Symptoms of a P0744 trouble code may include: Intermittent Indicator Lamp (MIL) illuminated (a.k.a. Check Engine Light) Minimal decrease in fuel economy, this will not affect engine performance Potential Causes Causes of this DTC may include: Wiring harness to transmission damaged, loose connection, or intermittent open/short circuit Torque converter clutch (TCC) solenoid Transmission control module (TCM) Diagnostic Steps for P0744 DTC Wiring harness - Check transmission wiring harness for damage or loose connections. Use a factory wiring diagram to locate the appropriate power source and all connection points between circuits. The transmission may be powered by a fuse or relay, and triggered by the TCM. Disconnect the transmission harness at the transmission connector, power source and TCM. Check for a short to ground inside the transmission internal wiring harness by locating the appropriate + and - pins for the torque converter clutch solenoid. Using a digital volt ohm meter (DVOM) set to ohms scale, check for a short to ground in the circuit with the positive lead on either pin and the negative lead to a known good ground. If resistance is low, suspect a short to ground the internal harness or the TCC solenoid - removing the transmission oil pan may be necessary to further diagnose the TCC solenoid. Test the wiring between the TCM and the wiring harness connector at the transmission case using the DVOM set to ohms. Check for a possible short to ground by moving the negative lead on the DVOM to a known good ground, resistance should be very high or over limit (OL). Test the wiring for the control circuit between the TCM and the wiring harness connector at the transmission case using the DVOM set to volts scale - it may be necessary to remove the pin from each side of the harness connector to isolate it from the harness while it is still plugged into the TCM and transmission case. With the positive lead on either end of the wiring and the negative lead to a known good ground, check for the presence of battery voltage with the key on/engine off. If voltage is present, suspect a short to power and determine the source of the short circuit in the wire harness assembly. Hint: Wiggling the wire harness and connectors while testing may help locate an intermittent short to power or ground. Torque converter clutch (TCC) solenoid - Check the resistance in the TCC solenoid and internal transmission wiring at the transmission case after removing the transmission harness plug (if applicable, some makes/models use a TCM bolted directly to the transmission case). Some makes/models use a transmission wire harness with the TCC solenoid and internal harness as a single unit. The DVOM should be set to ohms scale with the positive lead and negative lead on the pins for the TCC power and control circuit. Resistance should be within manufacturers specifications, if it is very high or over limit (OL), remove the transmission oil pan to inspect the solenoid inside the transmission if possible. Check for voltage on the power side circuit of the TCC solenoid with the key on/engine off and harnesses plugged or at the wire harness connector at the TCM with the DVOM set to volts scale, positive lead on the control side of the solenoid and the negative to a known good ground with the vehicles key on/engine off, battery voltage should be present. Tap the solenoid and wiggle the wiring to determine if a short to power or ground exists. Transmission control module (TCM) - Since the torque converter clutch is only activated during certain driving conditions, it will be necessary to monitor the TCM with an advanced scan tool to determine if the TCM is commanding the TCC solenoid and what the actual feedback reading is at the TCM. The TCC solenoid is normally controlled by a duty cycle to engage a more comfortable torque converter cluch engagement To test if the TCM is actually sending the signal, a graphing multimeter set to duty cycle or a digital storage oscilloscope will be required as well. The positive lead is probed into the wiring harness plugged into the TCM and the negative lead to a known good ground. The duty cycle shold be the same as being commanded by the TCM in the advanced scan tool reading. If the cycle is intermittent on rough road conditions, it may be a wiring fault. Re-check connections and if all wiring / solenoid is OK or if road conditions do not coincide with the intermittent readings, the TCM may be at fault.

Read more at: http://www.obd-codes.com/p0744
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Thats sounds alot like your torque converter

catalytic converter part is part of the exhaust system, torque converter part of transmission.if catalytic plugged car will only go 10 miles and hour, if you have torque converter problems car will stall out when you drive 30 miles and hour, when transmission goes in over drive, torque converter lock up.when you apply brakes torque converter suppose to unlock if not car will stall out when you come to a stop.

The problem involves the lock-up torque converter in the transmission.
Could be low or dirty fluid, but probably the converter or a solenoid.
You'll need a shop manual and major tools to fix it.

The situation you describe could be (i) low fluid in the torque converter, (ii) a faulty signal to or from the torque clutch solenoids, (iii) a crack in the torque lock up solenoid pipe leading to fluid pressure loss, or (iv) the torque clutch solenoid modulator is faulty. 1) Is there plenty of fluid on dip stick? 2) have the (transmission diagnostic) codes read at Autozone 3) Check that the transmission electrical connector plug socket pins are clean and free of corrosion 4) Check solenoids - Drain fluid, remove transmission pan and remove filter. Now looking at the back edge of the valve control assembly from left to right (as viewed in direction of travel) is the force motor/pressure control solenoid, two identical square shaped solenoids corresponding to '2 to 3 shift' and '1 to 2 shift' and, last on the right, the forward clutch accumulator. On the front edge of the valve assembly, again from left to right, we have torque converter clutch solenoid (A) and immediately above it, pointing straight up, the torque converter lock up solenoid (B) and finally on the left the 'down shift 3 to 2' solenoid. Unplug the torque converter clutch solenoid (A) and using a small screw driver remove the solenoid's retaining clip from the close by slot. Remove the solenoid. Also disconnect and then remove the two securing bolts holding the torque converter lock up solenoid (B) assembly and drop that out. Thoroughly clean both solenoids. Check up the end of the pipe of (B) with the aid of torch and look for any signs of cracks. Check both solenoids across the connector pins for electrical resistance: (B) should have 20 to 25 ohms and (A) should be 10 to 15 ohms. If there is either no or infinite resistance then this indicates either a short or open circuit respectively and the solenoid should be replaced. Note that (B) is an 'on/off' type solenoid and can be opened and closed by applying a 12volt source across the pins; (A) is a 'pulse width modulated' solenoid and so cannot be easily tested for full operation in isolation.

CHECK TRANSMISSION FLUID LEVEL.TORQUE CONVERTER NEED FLUID TO LOCK UP.IF FLUID LEVEL OKAY.CHECK TRANSMISSION FUSE.IF FUSE GOOD.TRANSMISSION TORQUE CONVERTER CLUTCH SOLENOID DEFECTIVE.OR TORQUE CONVERTER CLUTCH SHIFT VALVE IN VALVE BODY STUCK-OR TORQUE CONVERTER HAS INTERNAL DAMAGE.

P0743 is the Torque Converter Circuit Solenoid.The solenoid plug is on the front of the transmission and has a dark green/white and orange/black wire. The dark green/white should have 12V on it from fuse #10 when the ignition is on. The orange/black is a grounding wire from pin 79 of the powertrain controller which should only be grounded when the car is going over 45 mph or so. You could check that the wire is patent between the plug and the powertrain plug (near 0 ohms). The solenoid is a coil or wire so it would have a low, but non-0 resistance, maybe less than an ohm, but still not 0. To really test it you would need an impedence meter, but a good digital ohmmeter should show it to be slightly more resistance than is shown when you test the resistance of the meter leads themselves.If the resistance, the patency, and the 12V supply is all shown to be OK, then I would suspect the solenoid is not functing properly. If you are getting torque converter lock up when you accelerate slowly from 40 to 50 mph then it is working and the code is false. P1899 Park or neutral position switch stuck in park or gear. Recap: P0743 Torque converter clutch circuit faulty, P1899 Position switch to park and nutral stuck. Check the wire harness and look for any clips may be lose or disconnected and wires condition. Good luck and keep me posted. be glad to help

yeah i know exactly what it is its one of the transmission solenoids i beleive its called the torque converter circuit