P1777

P1777 STEP MOTOR





DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE

CAUTION:
Always drive vehicle at a safe speed.
1.PREPARATION BEFORE WORK
If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.
- GO TO 2.
2.
With CONSULT-III
1. Start the engine.
2. Select "Data Monitor" in "TRANSMISSION".
3. Select "RANGE" and "VEHICLE SPEED".
4. Drive the vehicle.
5. Maintain the following condition for 1 second or more.





6. Stop the vehicle.
7. Select "Self Diagnostic Results" in "TRANSMISSION".
Is "P1777" detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK STEP MOTOR CIRCUIT (PART 1)
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check resistance between TCM harness connector terminals.





Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 3.
2.CHECK STEP MOTOR CIRCUIT (PART 2)
Check resistance between TCM harness connector terminals and ground.





Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - GO TO 3.
3.CHECK STEP MOTOR
1. Disconnect CVT unit connector.
2. Check resistance between CVT unit connector terminals.





3. Check resistance between CVT unit connector terminals and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - GO TO 6.
4.CHECK CIRCUIT BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 1)
Check continuity between TCM harness connector terminals and CVT unit harness connector terminals.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair or replace damaged parts.
5.CHECK CIRCUIT BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 2)
Check continuity between TCM harness connector terminals and ground.





Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - Repair or replace damaged parts.
6. CHECK DTC (TCM)
With CONSULT-III
1. Perform "DTC CONFIRMATION PROCEDURE". SEE DTC Logic.
2. Select "Self Diagnostic Results" in "TRANSMISSION".
Is "P0840" detected?
YES-1 (Only "P1777" is detected)-There is a malfunction of the step motor. Replace the control valve. Removal And Installation.
YES-2 ("P1777" and "P0725"/"P1777" and "U1000"/"P1777", "P0725" and "U1000" are detected)-Replace the control valve. Removal And Installation.
YES-3 (Other than YES-1 and YES-2)-Replace the transaxle assembly. Removal And Installation (2WD) or Removal And Installation (AWD).
NO - Check intermittent incident. Intermittent Incident.