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DTC P0840: Malfunction of Secondary Pressure Sensor










DIAGNOSTIC FUNCTION


TCM conducts fault detection by monitoring the output voltage of the secondary pressure sensor.

DESCRIPTIONS OF MONITOR METHODS



MONITOR EXECUTION



MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)


Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
Sensor (The sensor below is determined to be normal)

LOGIC FLOW CHARTS (Monitor Sequence)




DTC SET CONDITIONS


Judgment Criteria

OBD-II DRIVE CYCLE PATTERN


Ignition switch : ON (start the engine and keep it for 10 seconds or more)

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III data list

  • Item 4: Secondary pressure sensor signal (Refer to Data List Reference Table .)

Q. Is the check result normal?
Intermittent malfunction
Go to Step 2.

STEP 2. Check the following connector:

  • B-08 CVT assembly connector
  • C-40 TCM connector
  • A-09 Intermediate connector
Check the terminals for a contact status problem and internal short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Check for open circuit and short to ground in the wiring harness between the TCM connector and the CVT assembly connector.

  • Between C-40 TCM connector (terminal No.39) and B-08 CVT assembly connector (terminal No.7)
  • Between C-40 TCM connector (terminal No.48) and B-08 CVT assembly connector (terminal No.19)
  • Between C-40 TCM connector (terminal No.49) and B-08 CVT assembly connector (terminal No.5)

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Symptom recheck after replacing the valve body assembly

Q. Is the check result normal?
The procedure is complete.
Replace TCM.