Code No. P0796:
Abnormality in Primary Pressure Solenoid Valve Function
DIAGNOSTIC FUNCTION
If the actual pulley ratio does not track with the target ratio, the CVT-ECU determines
whether the system is defective
JUDGEMENT CRITERIA
- When the target pulley ratio is less than 1.2 while the vehicle is being
driven, the actual pulley ratio remains from 2.0 to 2.4 for 5 seconds.
- When the target pulley ratio is more than 1.55 while the vehicle is being driven,
the actual pulley ratio remains from 0.35 to 0.75 for 5 seconds.
PROBABLE CAUSES
- Malfunction of the CVT assembly (Faulty primary pressure solenoid valve or
valve body assembly)
|
|
STEP 1. Check the following connector
|
|
|
Check the terminals for a contact status problem and internal short circuit.
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 2.
|
|
|
|
|
|
 Repair the defective connector.
|
|
|
|
|
|
STEP 2. Measure the output wave pattern of the primary pressure solenoid
valve at CVT-ECU connector (PRLS terminal).
|
|
|
(1)Connect the CVT assembly connector.
|
|
|
(2)Selector lever position: P range.
|
|
|
(4)Connect an oscilloscope, and measure the voltage between CVT-ECU connector PRLS
terminal and body earth.
OK: A wave pattern such as the one shown on  (Check
Procedure Using an Oscilloscope) should be output, and the maximum value should be 11 V or more
and the minimum value should be 1 V or less. There should be no noise in the output wave pattern.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 3.
|
|
|
|
|
|
Refer to diagnosis code No.P0970: Primary Pressure Solenoid Valve (short to earth) ,
or diagnosis code No.P0971: Primary Pressure Solenoid Valve (open circuit/ short to
power supply) .
|
|
|
|
|
|
STEP 3. Symptom recheck after erasing diagnosis code
|
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch to the LOCK (OFF) position, and then wait for one minute.
Then drive the vehicle until the engine has been warmed up.
|
|
|
(3)Check if the diagnosis code is stored.
|
|
|
Q.
Is the diagnosis code stored?
|
|
|
Replace the CVT assembly.
|
|
|
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions .).
|
|
|
|