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DTC P0868: Secondary Pressure Drop
 
 
 
 
SECONDARY PRESSURE SENSOR SYSTEM CIRCUIT
Refer to .
 
 
 
 
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)
  • Not applicable
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
 
 
DIAGNOSIS
STEP 1. Check other diagnostic trouble codes.
Are other diagnostic trouble codes stored?
Go to the appropriate troubleshooting.
Go to Step 2.
 
STEP 2. Check the following connector:
  • B-120 CVT assembly connector
  • C-130 TCM connector
  • A-16 Intermediate connector
Check contacts for internal short circuit.
Is the check result normal?
Go to Step 3.
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-130 TCM connector (terminal No.39) and B-120 CVT assembly connector (terminal No.7)
OK: 100 Ω or more
Is the check result normal?
Go to Step 4.
Repair the wiring harness.
 
STEP 4. Symptom recheck after erasing diagnostic trouble code
Is the check result normal?
Intermittent malfunction
Replace the TCM, and then go to Step 5.
 
STEP 5. Retest the system.
Is the check result normal?
The procedure is complete.
Replace the CVT assembly.