P0840

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

The 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
1.Turn ignition switch ON.
2.Select "Data Monitor" in "TRANSMISSION".
3.Make sure that output voltage of CVT fluid temperature sensor is within the range specified 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".
Is "P0840" detected?
YES- Go to Diagnosis Procedure (see below).
NO- Check intermittent incident. 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 vehicle side harness connector terminals.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 5.

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 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 (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) (STEP

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 6.
NO- Repair or replace damaged parts.

6. CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (STEP

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.

7. CHECK TERMINAL CORD ASSEMBLY (PART 1)

1.Remove terminal cord assembly. Exploded View.
2.Check continuity between CVT unit harness connector terminals and control valve harness connector terminals.





Is the inspection result normal?
YES- GO TO 8.
NO- Repair or replace damaged parts.

8. CHECK TERMINAL CORD ASSEMBLY (PART 2)

Check terminal cord assembly harness cladding for damage.
Is the inspection result normal?
YES- GO TO 9.
NO- Repair or replace damaged parts.

9. CHECK DTC (TCM)

With CONSULT
1.Perform "DTC CONFIRMATION PROCEDURE". .
2.Select "Self Diagnostic Results" in "TRANSMISSION".
Is "P0840" detected?
YES-1 (Only "P0840" is detected)-There is a malfunction of the secondary pressure sensor. Replace the control valve. Removal And Installation.
YES-2 ("P0840" and other than "P0840" are detected)-Replace the transaxle assembly. Transmission Assembly (2WD) or Transmission Assembly (AWD).
NO- Check intermittent incident. Intermittent Incident.