Solenoid Hydraulic Circuits

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

LINE pressure from the pump is directed to the individual shift, TCC solenoid and LPC solenoid by the solenoid regulator valve through the SREG circuit. The PCM controlled solenoids, direct full or regulated SREG pressure to the valves that they control.

For electrical operation of the solenoids, refer to TRANSMISSION ELECTRONIC CONTROL SYSTEM .

The LPC solenoid sends varying pressure to the main regulator valve to control line pressure.

In the PARK and NEUTRAL position, the PCM supplies low current to Shift Solenoid D (SSD) to apply high-regulated pressure to the solenoid multiplex valve which directs the pressure to the D1 regulator and latch valves to apply the low/reverse clutch (D).

In the REVERSE position, the PCM supplies low current to Shift Solenoid B (SSB) to apply high-regulated pressure to the clutch B regulator and latch valves to apply the direct clutch (B). The PCM also supplies low current to SSD to apply high-regulated pressure to the solenoid multiplex valve which directs the pressure to the D1 regulator and latch valves to apply the low/reverse clutch (D).

In 1st gear, the PCM supplies high current to Shift Solenoid A (SSA) to apply high-regulated pressure to the clutch A regulator and latch valves to apply the forward clutch (A). The PCM also supplies low current to SSD to apply high-regulated pressure to the solenoid multiplex valve which directs the pressure to the D1 regulator and latch valves to apply the low/reverse clutch (D).

In 2nd gear, the PCM supplies high current to SSA to apply high-regulated pressure to the clutch A regulator and latch valves to apply the forward clutch (A). The PCM also supplies high current to Shift Solenoid C (SSC) to apply high-regulated pressure to the clutch C regulator valve to apply the intermediate clutch (C).

In 3rd gear, the PCM supplies high current to SSA to apply high-regulated pressure to the clutch A regulator and latch valves to apply the forward clutch (A). The PCM also supplies low current to Shift Solenoid B (SSB) to apply high-regulated pressure to the clutch B regulator and latch valves to apply the direct clutch (B).

In 4th gear, the PCM supplies high current to SSA to apply high-regulated pressure to the clutch A regulator and latch valves to apply the forward clutch (A). The PCM also supplies low current to SSD to apply high-regulated pressure to the solenoid multiplex valve which directs the pressure to the clutch E regulator and latch valves to apply the overdrive clutch (E). The PCM turns on Shift Solenoid E (SSE) to apply pressure to the solenoid multiplex valve and the drive enable valve to direct SSD pressure to the clutch E regulator and latch valves.

In 5th gear, the PCM supplies low current to SSD to apply high-regulated pressure to the solenoid multiplex valve which directs the pressure to the clutch E regulator and latch valves to apply the overdrive clutch (E). The PCM turns on SSE to apply pressure to the solenoid multiplex valve and the drive enable valve to direct SSD pressure to the clutch E regulator and latch valves. The PCM also supplies low current to SSB to apply high-regulated pressure to the clutch B regulator and latch valves to apply the direct clutch (B).

In 6th gear, the PCM supplies low current to SSD to apply high-regulated pressure to the solenoid multiplex valve which directs the pressure to the clutch E regulator and latch valves to apply the overdrive clutch (E). The PCM turns on SSE to apply pressure to the solenoid multiplex valve and the drive enable valve to direct SSD pressure to the clutch E regulator and latch valves. The PCM also supplies high current to SSC to apply high-regulated pressure to the clutch C regulator valve to apply the intermediate clutch (C). To apply the TCC, the PCM supplies high current to the TCC solenoid to apply high-regulated pressure to the converter release regulator valve and the bypass clutch control regulator valve to apply the TCC.

In 3rd gear fail safe, all solenoids are off. SSB, in the off position, applies high pressure to the clutch B regulator and latch valves to apply the direct clutch (B). The forward clutch (A) is hydraulically applied in 3rd gear fail safe. PCA provides maximum solenoid pressure to the main regulator valve for maximum line pressure. Also, SSD is on which applies high pressure to the solenoid multiplex valve which is directed to the drive enable valve where it is blocked.