P0780

P0780 SHIFT

Description

The TCM detects the malfunction of low brake solenoid valve. This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


CAUTION:
Always drive vehicle at a safe speed.

1. PRECONDITIONING

If "DTC CONFIRMATION PROCEDURE" is previously conducted, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.
- GO TO 2.

2. CHECK DTC DETECTION

With CONSULT
1.Start the engine.
2.Select "SLCT LVR POSI", "ACCELE POSI" and "GEAR" in "Data Monitor" in "TRANSMISSION".
3.Drive vehicle and maintain the following conditions.





4.Perform "Self Diagnostic Results" in "TRANSMISSION".
With GST
Follow the procedure "With CONSULT".
Is "P0780" detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace damaged parts.

2. DETECT MALFUNCTIONING ITEM

Disassemble the A/T assembly to check component parts. Refer to "Disassembly" Disassembly.
NOTE:
Check the component parts, referring to "Possible cause" in "DTC DETECTION LOGIC". Refer to "DTC Logic" .
Is the inspection result normal?
YES- Replace control valve & TCM. Refer to "Removal and Installation" Removal and Installation.
NO- Repair or replace damaged parts.