P0840

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A





Description
- Secondary pressure sensor is installed to control valve.
- Secondary pressure sensor detects pressure that is applied to secondary pulley.
- Secondary pressure sensor converts pressure that is applied to secondary pulley to output voltage and transmits the signal to TCM.
- Secondary pressure sensor changes voltage according to pressure change. The voltage increases as the pressure increases.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Start the engine.
2. Select "Data Monitor" in "TRANSMISSION".
3. Select "ATF TEMP SEN".
4. Maintain the following conditions for 5 seconds or more.

ATF TEMP SEN : 2.41 V or less

5. Select "Self Diagnostic Results" in "TRANSMISSION".
With GST
Follow the procedure "With CONSULT-III".
Is "P0840" detected?
YES - Go to P0840.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK TCM INPUT SIGNAL
1. Turn ignition switch OFF.
2. Start the engine.
3. Check voltage between TCM vehicle side harness connector terminals.





Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - GO TO 2.
2.CHECK POWER AND SENSOR GROUND
1. Turn ignition switch OFF.
2. Check voltage between TCM vehicle side harness connector terminals.





Is the inspection result normal?
YES - GO TO 3.
NO - Go to P1701.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SENSOR) (PART 1)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit harness connector.
3. Check continuity between TCM vehicle side harness connector terminals and CVT unit vehicle side harness connector terminals.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace damaged parts.
4.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SENSOR) (PART 2)
Check continuity between TCM vehicle side harness connector terminals and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair or replace damaged parts.
5.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - Replace transaxle assembly. Exploded View.
NO - Repair or replace damaged parts.