P0748 being a pressure control solinoid ,elecrical, to me a means that there is an electical problem in the solinoid circuit or the solinoid it self maybe burnt out. On chrysler the solinoids are duty-cycle and controlled by the P. Step 2 Determine the condition and level of the transmission fluid. Refer to in Wiring Systems. How does a mechanic diagnose the P0748 code? These valves can stick open, therefore letting air in when the throttle is open, giving the engine too much air.
Step 5 Bear in mind that while testing procedures and electrical values differ between applications, in most cases there should be zero resistance on circuits and across connectors. I recommend joining AlldataDiy as you can get the complete diagrams and instructions to replace the defective parts. Even if the problem has not advanced to the point that internal mechanical failure has occurred, experiencing symptoms means that there is an issue which could become serious in very short order. You don't show what engine yours has , I'am assuming you have 3. Step 4 If the code persists but the wiring is free of damage, prepare to perform resistance, continuity, and ground integrity checks on all associated wiring, but be sure to determine the function and color coding of all relevant wiring before testing any circuits to prevent causing short circuits. Other codes may set, such as those related to gear ratio, shift solenoids, or transmission slippage. Refer to and in Wiring Systems.
P0748 code definition This code stands for Pressure Control Solenoid Electrical. Note that control module failure is rare, and the fault must be sought elsewhere before any control module is replaced What are the symptoms of code P0748? Did you find and correct the condition? What are the common causes of code P0748? The image below shows a typical transmission pressure control solenoid, such as might be found on almost any modern transmission. I have factory service info. This information could be of use should an intermittent fault be diagnosed later on. Refer to in Wiring Systems. I am not seeing P1811 - maximum adapt and long shift. If this code is stored you may not notice any discernible symptoms, or you may notice severe shifting problems such as a lack of shifting altogether.
What repairs can fix the P0748 code? Did you complete the replacement? As a mechanic myself testing, trouble shooting and repair was not that difficult. Refer to in Engine Controls. If the fluid is level is low, adjust the level, but be sure to locate and repair all fluid leaks before returning the vehicle to service. The engine may stall at idle, shifting may be harsh or there could be slippage, or the transmission could overheat. Manual gives u possible solution to each code and repair and or replace. If the fluid appears or smells burned or is a dark, opaque color, it is almost a certainty that the vehicle has been operated at a low fluid level. During diagnosis, a low or high line pressure actual versus desired may be observed.
You can get the complete bulletin from alldatadiy or directly from the dealer. Does the resistance measure within the specified range? This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced. Shift solenoid was very difficult to get to. Transmission issues should always be addressed as quickly as possible. Located under the head lamp passenger side.
It will be replaced for free, if your car has less than 80,000 miles on it. How do you troubleshoot P0748? Look at the plug wires to make sure they are not burnt or laying on the exhaust. A circuit electrical, p0743- torque converter circuit electrical, p0747- pressure ctrl sol A circuit stuck on, p0712- trans fluid temp sensor A circuit low input, p1624- manufacturer. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced. You should have the problem addressed at a transmission shop. While some parts of the diagnostic process may be done at home, such as assessing the transmission fluid if you have a dipstick , transmissions are not typically the kind of project you want to do in the driveway.
P0765 - Shift Control Solenoid Valve D Overdrive Solenoid. If deviations from stated values are found, make repairs or replace wiring as required to ensure that all electrical values fall within the ranges specified by the manufacturer. What type code reader are you using to read these codes? If you continue to drive the vehicle with this condition the transmission will eventually destroy itself. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. See pdf attatched, and yes, the pcm freezes the shift adapt.
The pressure control solenoid needs to be checked for proper operation. The applied amperage can vary from 0. The pressure control solinoid is in the trans. Did you find and correct the condition? I have only two codes P0760 P0755 but my car is a mitsubishi galant 2. If the resistance on any circuit exceeds zero ohms or the value specified in the manual , the circuit is shorted; if there is no continuity on any circuit that circuit is open. Aug 03, 2017 Oct 27, 2014 - Uploaded by ProProjects Thanks to ProProjects P0700 P0743 Torque Converter Clutch Circuit Electrical.
The idle valve will open and give a small amound of air to the engine, just enough to run it at idle speed. If you have more miles than 80K, call the Toyota Customer Experience Center at 800-331-4331; an analyst may be able to help offset your costs; they do this quite frequently. This valve sits on the inlet manifold and basicly regulated the flow of air for tickover or idle. I did google a bit, found this. Refer to in Wiring Systems. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle.