[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
23 -AUTOMATIC TRANSMISSION > 23A-CVT > TROUBLESHOOTING<CVT><CVT> > DIAGNOSIS CODE PROCEDURES > CODE NO. P0843 SECONDARY PRESSURE SENSOR SYSTEM
Code No. P0843: Malfunction of Secondary Pressure Sensor (high input)
 
 
 
 
DIAGNOSTIC FUNCTION
The CVT-ECU determines that the system is defective when the secondary pressure sensor output voltage is higher than a predetermined value.
 
 
JUDGEMENT CRITERIA
All the conditions listed below remain for 5 seconds.
  • The temperature, which the CVT fluid temperature sensor detects, is higher than -20°C.
  • The target secondary pressure is 5.7 MPa or less.
  • The secondary pressure sensor output voltage is 4.7 V or more.
 
 
PROBABLE CAUSES
  • Malfunction of the valve body assembly (Faulty secondary pressure sensor)
  • Damaged wiring harness and connectors
  • Malfunction of CVT-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Voltage measurement at CVT assembly connector (LPRS terminal)
(1) Measure the CVT-ECU connector side by backprobing.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the CVT assembly connector (LPRS terminal) and body earth.
Is the voltage approximately 4.7 V or more?
Go to Step 2.
NO : Go to Step 4.
 
STEP 2. Check for short to power supply in LPRS line between the CVT assembly connector and the CVT-ECU connector
Is the check result normal?
Go to Step 3.
Repair the connector(s) or the wiring harness.
 
STEP 3. Check for short to power supply in signal line between the CVT assembly connector and the valve body harness connector (secondary pressure sensor line)
Refer to .
Is the check result normal?
Replace the valve body assembly (Refer to ).
Replace the valve body harness (Refer to ).
 
STEP 4. Voltage measurement at CVT-ECU connector (LPRS terminal)
(1) Drive the vehicle until the engine is warmed up.
(2) Measure the CVT-ECU connector side by backprobing.
(3) Selector lever position: N
(4) Engine: Idling
(5) Measure the voltage between the CVT-ECU connector (LPRS terminal) and body earth.
OK: approx. 1.67 - 1.69 V
Is the check result normal?
Go to Step 5.
Replace the valve body assembly (Refer to ).
 
STEP 5. Symptom recheck after erasing diagnosis code
Is the diagnosis code set?
Replace the CVT-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).