What is solenoid engine?
A solenoid engine is defined as the engine that works by passing electricity through the coils which makes the pistons move back and forth due to electromagnetism.
How to diagnose a p0748 pressure control solenoid?
When diagnosing a P0748 code, it is important to record the freeze frame information and then to duplicate the code setting conditions with a test drive at the freeze frame road speed. Start out from a dead stop and gently accelerate. Watch the scan data to see if the PCM is commanding the Pressure Control Solenoid.
How does the oil control solenoid work on a Honda?
When conditions allow, typically at high engine speeds above about 4000 RPM, the PCM opens an oil control solenoid that allows pressurized engine oil to act on a sliding locking pin that locks the three valve lifters together.
Where is the bypass solenoid on a Honda?
The bypass solenoid is under a cover next to the canister. The solenoids are powered by a black/orange wire. With the key in the ON position, check for battery voltage on black/orange wires to both solenoids.
How does the ECM work on a Honda p1457?
To operate the solenoids, the ECM grounds the second wire to each solenoid. With the key still in the ON position, provide a ground to the green/red wire on the canister vent shut valve and check that it actually operates and holds vacuum using a handheld vacuum pump.
When diagnosing a P0748 code, it is important to record the freeze frame information and then to duplicate the code setting conditions with a test drive at the freeze frame road speed. Start out from a dead stop and gently accelerate. Watch the scan data to see if the PCM is commanding the Pressure Control Solenoid.
When does the PCM set the code p0748?
When the PCM detects an electrical failure or malfunction in a pressure control solenoid control circuit (or in the solenoid itself) that causes the actual pressure to differ from the desired pressure by a preset amount, it will set code P0748, and may also illuminate a warning light.
How does the PCM control the pressure solenoids?
Based on the signals from associated devices monitoring the speed of the vehicle, the PCM controls the pressure solenoids to direct fluid at the appropriate pressure to various hydraulic circuits that change the transmission gear ratio at the correct time.
Are there more than one pressure control solenoid?
NOTE: Take note that some, if not most modern applications/transmissions have more than one pressure control solenoid, and codes that relate to the different pressure control solenoids are invariably qualified with the letters “A”, “B”, and “C”.