P0746

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRESSURE SOLENOID VALVE)

Description
- The pressure control solenoid valve A (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 PRS CNT SOL/A FCTN 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
- Output speed sensor (Secondary speed sensor)
- Input 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 CVT-106, "Diagnostic Procedure".

WITH GST
Follow the procedure WITH CONSULT-III.

Diagnostic 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. Refer to CVT-40, "LINE PRESSURE TEST". Line Pressure Test
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.

3. DETECT MALFUNCTIONING ITEM
Check pressure control solenoid valve A (line pressure solenoid valve). Refer to CVT-103, "Component Inspection".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.

4. CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor) system. Refer to CVT-83, "DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)". P0720
Refer to CVT-77, "DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)". 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.
- 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 CVT-105, "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> Replace the transaxle assembly or TCM.