P0840

P0840 TRANSMISSION FLUID PRESSURE SENSOR A (SEC PRESSURE SENSOR)





Description
The transmission fluid pressure sensor A (secondary pressure sensor) detects secondary pressure of CVT and sends a signal to the TCM.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE

NOTE:
Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1. CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON.
2. Select "Data Monitor" in "TRANSMISSION".
3. Check that output voltage of CVT fluid temperature sensor is within the range below.

ATF TEMP SEN : 1.0 - 2.0 V
If it is out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage (cool down the fluid)

4. Start engine and wait for at least 5 consecutive seconds.
With GST
Follow the procedure "With CONSULT-III".
Is "P0840 TR PRS SENS/A CIRC" detected?
YES - Go to "Diagnosis Procedure".
NO - Check intermittent incident. Refer to Intermittent Incident.




Diagnosis Procedure
1. CHECK INPUT SIGNAL





1. Start engine.
2. Check voltage between TCM connector terminal and ground.





Is the inspection result normal?
YES - GO TO 8.
NO - GO TO 2.
2.CHECK POWER AND SENSOR GROUND





Check voltage between TCM terminals.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 5.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR)] (PART 1)





1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit connector.
3. Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side harness connector terminal.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace damaged parts.
4. CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR)] (PART 2)





Check continuity between TCM vehicle side harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 7.
NO - Repair or replace damaged parts.
5. CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART 1)





1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit 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 6.
NO - Repair or replace damaged parts.
6. CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART 2)





Check continuity between TCM vehicle side harness connector terminals and ground.





Is the inspection result normal?
YES - GO TO 7.
NO - Repair or replace damaged parts.
7. CHECK TCM
1. Replace with the same type of TCM. Refer to Exploded View.
2. Connect each connector.
3. Perform "DTC CONFIRMATION PROCEDURE". Refer to "DTC Logic".
Is "P0840 TR PRS SENS/A CIRC" detected?
YES - Replace transaxle assembly. Refer to Exploded View.
NO - Replace TCM. Refer to Exploded View.
8. DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES - Replace TCM. Refer to Exploded View.
NO - Repair or replace damaged parts.