P1774

P1774 LOW COAST BRAKE SOLENOID





Description
- Low coast brake solenoid valve is turned ON or OFF by the TCM in response to signals transmitted from the transmission range switch, output speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the optimum position.
- 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.




DTC Logic

DTC DETECTION LOGIC

DTC DETECTION LOGIC:

DTC CONFIRMATION PROCEDURE

CAUTION:
Always drive vehicle at a safe speed.

NOTE:
If "DTC CONFIRMATION PROCEDURE" has been previously performed, always turn ignition switch
OFF. Then wait at least 10 seconds before performing the next test.
1.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select "Data Monitor" in "TRANSMISSION".
3. Drive vehicle and maintain the following conditions.

GEAR : "1" or "2" (LC/B ON/OFF)
MANU MODE SW : ON

4. Stop vehicle and perform step 3 again.
5. Stop vehicle.
6. Turn ignition switch OFF, then perform step 1 to 4 again.
With GST
Follow the procedure "With CONSULT-III".
Is "P1774" detected?
YES - Go to P1774.
NO - Check intermittent incident. Refer to Intermittent Incident.




Diagnosis Procedure
1.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to Main Power Supply and Ground Circuit.
Is the inspection result normal?
YES - Replace the control valve with TCM. Refer to Exploded View.
NO - Repair or replace damaged parts.