Code No. P0848:
Malfunction of Primary Pressure Sensor (high input)
DIAGNOSTIC FUNCTION
The CVT-ECU determines that the system is defective when the primary 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 primary pressure sensor output voltage is 4.7 V or more.
PROBABLE CAUSES
- Malfunction of the valve body assembly (Faulty primary pressure sensor)
- Damaged wiring harness and connectors
- Malfunction of CVT-ECU
|
|
STEP 1. Voltage measurement at CVT assembly connector (PRPS
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 (PRPS terminal) and body
earth.
|
|
|
Q.
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 PRPS line between the CVT
assembly connector and the CVT-ECU connector
|
|
|
Q.
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 (primary pressure sensor line)
|
|
|
Refer to  .
|
|
|
Q.
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 (PRPS 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
|
|
|
(5)Measure the voltage between the CVT-ECU connector (PRPS terminal) and body earth.
OK: approx. 0.90 - 0.92 V
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5
|
|
|
|
|
|
Replace the valve body assembly (Refer to ).
|
|
|
|
|
|
STEP 5. Symptom recheck after erasing diagnosis code
|
|
|
Q.
Is the diagnosis code set?
|
|
|
Replace the CVT-ECU.
|
|
|
|
|
|
Intermittent malfunction.
|
|
|
|