What is the function of a starter solenoid?
Starter Solenoid. The starter solenoid serves primarily as an electric switch for the starter motor. When the ignition is engaged, the solenoid completes the circuit between the vehicle’s battery and the starter motor. At the same time, an electrically activated lever inside the solenoid engages a drive pinion and clutch assembly inside…
How is the torque converter clutch solenoid controlled?
The fluid pressure that applies and releases the torque converter lockup clutch is controlled by the torque converter clutch solenoid. The opening and closing of the TCC solenoid valve is controlled by the transmission control module (TCM) or powertrain control module (PCM), depending on the vehicle.
What happens when a transmission solenoid goes into Fail Safe?
A failed transmission solenoid or an open circuit anywhere in the electrical system may cause the transmission to go into Fail Safe (or “limp” mode as it is also called) in order to protect the transmission from internal damage that might be caused by the faulty solenoid or open circuit.
Where is the lockup clutch in a transmission converter?
To prevent slipping at certain speeds (normally speeds exceeding 37 mph) a lockup clutch located inside the converter locks the engine’s output drive to the transmission’s input shaft to achieve a 1:1 ratio – meaning 100% of the engine’s power is now reaching the transmission.
What happens when the solenoid is disengaged from the clutch?
The solenoid moves a valve that sends pressurized fluid to the clutch circuit, engaging the TCC. When the clutch is disengaged, the torque converter operates normally, allowing the engine to rotate without stalling while the vehicle is slowing and coming to a stop.
The fluid pressure that applies and releases the torque converter lockup clutch is controlled by the torque converter clutch solenoid. The opening and closing of the TCC solenoid valve is controlled by the transmission control module (TCM) or powertrain control module (PCM), depending on the vehicle.
What happens to the TCC if the solenoid is inoperative?
The TCM controls the TCC solenoid. If the solenoid were to stick closed, the TCC will stay engaged while slowing the vehicle. This will cause the vehicle to stumble and eventually stall. If the TCC solenoid were inoperative, the transmission fluid temperature may increase and fuel economy would suffer.
Do you need a solenoid valve for a fan clutch?
Freon Pressure Switch, and N.C. Solenoid Valve are the only controls absolutely necessary for Fan Clutch operation. The N.C. Manual Switch, Air Pressure Switch, and Indicator Light are all optional controls and may be left out of the circuit.