47 Solenoid Switch Valve Latched In L-R Position

THEORY OF OPERATION:
The Solenoid Switch Valve (SSV) controls the direction of the transmission fluid when the L-R/TCC solenoid is energized. SSV will be in the downshifted position in 1st gear, thus directing the fluid to the L-R clutch circuits. In 2nd, 3rd, and 4th, the SSV will be in the upshifted position and directs the fluid into the torque converter clutch (TCC).

When doing PEMCC or FEMCC, the L-R pressure switch should indicate no pressure if the SSV is in the TCC position. If the L-R pressure switch indicates pressure while in PEMCC or FEMCC, EMCC operation is aborted and inhibited to avoid inadvertent application of the L-R clutch. Partial EMCC will be attempted if the L-R pressure switch does not indicate pressure. A second detection of L-R pressure results in setting the code.

If the transmission senses the L-R pressure switch closing while performing PEMCC or FEMCC. This code will be set after two unsuccessful attempts to perform PEMCC or FEMCC.

LIMP-IN:
YES

WHEN MONITORED/SET CONDITIONS:
Continuously when doing partial or full EMCC (PEMCC or FEMCC)

TRANSMISSION EFFECTS:
At speed above 45 MPH, EMCC is inhibited. Once speed falls below 45 MPH, the transmission will go into relay open limp-in mode.

POSSIBLE CAUSES:
- Valve body - Solenoid valve stuck in L-R position
- Intermittent short to ground or open circuit in L-R Pressure Switch Sense Circuit (with code 24 only)
- Defective solenoid pack (with code 24 only)
- Defective TCM (with code 24 only)