P0780

P0780 SHIFT





Description
- TCM detects the malfunction of low brake solenoid valve.
- TCM measures the downshift time from 4GR to 3GR during "D" position, and detects the malfunction if the shifting time is excessively short.




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-III
1. Start the engine.
2. Select "GEAR" in "Data Monitor" in "TRANSMISSION".
3. Shift the selector lever to "D" position.
4. Accelerate until "4" appears on "GEAR", then release the accelerator pedal.
5. Decelerate until "3" appears on "GEAR" by depressing the brake pedal gradually.

CAUTION:
The brake pedal must be depressed slowly.
6. Then repeat steps 4 to 5 three more times.
7. Stop the vehicle, and then turn the ignition switch OFF.
8. Perform steps 1 to 7 again.
9. Perform "Self Diagnostic Results" in "TRANSMISSION".
With GST
Follow the procedure "With CONSULT-III".
Is "P0780" detected?
YES - Go to P0780.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK INTERMITTENT INCIDENT
How to Perform Efficient Diagnosis For an Electrical Incident.
Is the inspection result normal?
YES - Replace A/T assembly. Exploded View.
NO - Repair or replace damaged parts.