P0746

P0746 PRESSURE CONTROL SOLENOID A





Description
- The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.




CONSULT-III Reference Value









On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0746" with CONSULT-III is detected under the following conditions.
- Unexpected gear ratio was detected in the LOW side due to excessively low line pressure.




Possible Cause
- Line pressure control system
- Secondary speed sensor
- Primary speed sensor




DTC Confirmation Procedure

CAUTION:
Always drive vehicle at a safe speed.

NOTE:
If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.
After the repair, touch "ERASE" on "SELF-DIAG RESULTS" and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
2. Start engine and maintain the following conditions for at least 10 consecutive seconds. Test start from 0 km/h (0 MPH).
ATF TEMP SEN: 1.0 - 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: "D" position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.
3. If DTC is detected, go to SEE Diagnosis Procedure.

WITH GST
Follow the procedure "WITH CONSULT-III".




Diagnosis Procedure
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select "MAIN SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Start vehicle and read out the value of "PRI PRESS".






Without CONSULT-III
1. Start engine.
2. Check voltage between TCM connector terminal and ground.






OK or NG
OK - GO TO 5.
NG - GO TO 2.
2.CHECK LINE PRESSURE
Perform line pressure test. CVT Trouble Diagnosis.
OK or NG
OK - GO TO 3.
NG - Repair or replace damaged parts. CVT Trouble Diagnosis.
3.DETECT MALFUNCTIONING ITEM
Check line pressure solenoid valve. P0745.
OK or NG
OK - GO TO 4.
NG - Repair or replace damaged parts.
4.CHECK SECONDARY SPEED SENSOR SYSTEM AND PRIMARY SPEED SENSOR SYSTEM
Check secondary speed sensor system and primary speed sensor system. P0720, P0715.
OK or NG
OK - GO TO 5.
NG - Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEM
Check the following:
- Power supply and ground circuit for TCM. P1701.
- The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - GO TO 6.
NG - Repair or replace damaged parts.
6.CHECK DTC
Perform SEE DTC Confirmation Procedure.
OK or NG
OK - INSPECTION END
NG - Replace the transaxle assembly or TCM. Removal and Installation (MR20DE), Removal and Installation (QR25DE).