DTC P1799 Interlock

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Perform the interlock judgment when the oil pressure switch pattern detects the specified interlock patterns other than shifting.

TROUBLE SYMPTOM:

Locked to 2nd or 4th gear depending on the vehicle condition at the time of diagnosis.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC OF TCM.	Is any DTC of the followings detected? P0751, P0753, P0756, P0758, P0761, P0763, P0766, P0768, P0771, P0773, P1798	Perform the diagnosis according to DTC.	Go to step 2.
2 DRIVING CHECK. Turn the ignition switch to OFF. After starting the engine again, perform a drive check with the following conditions. Keep the speed at 20 km/h with SPORT shift mode in 1st. Read the I/C oil pressure switch data of TCM while driving using Subaru Select Monitor.	Is OFF displayed?	Go to step 3.	Perform the diagnosis according to DTC P0756.
3 DRIVING CHECK. Turn the ignition switch to OFF. After starting the engine again, perform a drive check based on the Inspection Mode with the following conditions. < Ref. to PROCEDURE , Inspection Mode. > Keep the speed at 20 km/h with manual mode in 1st. Read the D/C oil pressure switch data while driving using Subaru Select Monitor.	Is OFF displayed?	Go to step 4.	Perform the diagnosis according to DTC P0766.
4 DRIVING CHECK. Turn the ignition switch to OFF. After starting the engine again, perform a drive check with the following conditions. Drive the vehicle at the same speed with manual mode in 3rd, 4th and 5th. Read the LC/B oil pressure switch data while driving using Subaru Select Monitor.	Is OFF displayed?	Go to step 5.	Perform the diagnosis according to DTC P0771.
5 DRIVING CHECK. Turn the ignition switch to OFF. After restarting the engine, perform a drive check based on the Inspection Mode. < Ref. to PROCEDURE , Inspection Mode. >	Is DTC displayed?	Replace the control valve body.	Temporary poor contact occurs. Check that the harness connector is not faulty.