DTC 77

Trouble Code 77-Duty Solenoid B





8P1: CHECK TROUBLE CODE.





8P2: CHECK LOCK UP-DUTY SOLENOID GROUND LINE.





8P3: CHECK LOCK-UP DUTY SOLENOID.





8P4: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.





8P5: CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.





8P6: PREPARE SUBARU SELECT MONITOR.





8P7: CHECK INPUT SIGNAL EMITTED FROM TCM.





8P8: CHECK OUTPUT SIGNAL EMITTED FROM TCM.





8P9: CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR.





8P10: CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR.





8P11: CHECK LOCK-UP DUTY SOLENOID (IN TRANSMISSION).





8P12: CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION.





8P13: CHECK POOR CONTACT.

Diagnosis:
Output signal circuit of duty solenoid B is open or shorted.

Trouble Symptom:
No "lock-up" (after engine warm-up).





Wiring diagram