25 L-R/OD Pressure Switch Circuit

THEORY OF OPERATION:
The transmission system uses three pressure switches to monitor the fluid pressure in the L-R, 2-4, and OD elements. The pressure switches are continuously monitored for the correct states in each near as shown below.





This code is set if the L- R and OD pressure switches are either open or closed at the wrong time in a given gear. (See chart above). This code indicates that both the L- R and OD pressure switches indicated the wrong state at the time the fault was set.

LIMP-IN:
- YES (1993 - 1995 MY)
- NO (1996 - 1997 AND LATER MY)

WHEN MONITORED/SET CONDITIONS:
Whenever the engine is running.

TRANSMISSION EFFECTS:
- 93-95 model year + 96 model year V- 1 calibration - relay open limp-in mode
- 96 model year V-2 calibration (default desensitization) and later - Code eliminated, codes 21 and 24 will be set

POSSIBLE CAUSES:
- If code 35 is present, ignore code 25 and perform code 35 diagnostic procedures
- If code 35 is not set, follow diagnostic procedures for codes 21 and 24