P0868

DTC P0868: Secondary Pressure Drop

SECONDARY PRESSURE SENSOR SYSTEM CIRCUIT

Refer to P0840.

DIAGNOSTIC FUNCTION

TCM detects the secondary pressure drop during driving.

DESCRIPTIONS OF MONITOR METHODS

- The value obtained by subtracting the actual secondary pressure sensor reading from the target secondary pressure sensor reading is 0.25 MPa (36 psi) or more.

MONITOR EXECUTION

- Engine speed : 450 r/min or more

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- P0741: Abnormality in lockup function
- P0746: Abnormality in hydraulic control system function
- P0841: Abnormality in line pressure sensor function
Sensor (The sensor below is determined to be normal)

- Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions

- Engine speed: 450 r/min or more.
- Voltage of battery: 9 volts or more.
- Voltage of battery: 16 volts or less.
Judgment Criteria

- Secondary linear solenoid performance fail [target secondary pressure - measured secondary pressure: 0.25 MPa (36 psi) or more. (1.52 seconds)]: 2 count or more.

OBD-II DRIVE CYCLE PATTERN

transmission range: D (Drive the vehicle for 10 seconds or more while the accelerator opening angle is 20% or more)

PROBABLE CAUSES

- Damaged wiring harness and connectors
- Malfunction of CVT assembly
- Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. Check other diagnosis codes.

Q. Are other diagnosis codes set?

YES Go to the appropriate troubleshooting.
NO Go to Step 2.
STEP 2. Check the following connector:

- B-08 CVT assembly connector
- C-40 TCM connector
- A-09 Intermediate connector

Check contacts for internal short circuit.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the defective connector.
STEP 3. Check for 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)

OK: 100ohms or more


Q. Is the check result normal?

YES Go to Step 4.
NO Repair the wiring harness.
STEP 4. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?

YES Intermittent malfunction
NO Replace the TCM, and then go to Step 5.
STEP 5. Retest the system.

Q. Is the check result normal?

YES The procedure is complete.
NO Replace the CVT assembly.