DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) [04/2013 - 06/2014]: Procedure
WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)
- Disconnect the transmission wire connector from the transmission.
*a Component without harness connected
(Transmission Wire) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 11 (SL1+) - 3 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω - Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for short)
Tester Connection Condition Specified Condition 11 (SL1+) - Body ground Always 10 kΩ or higher 3 (SL1-) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
See step 3
Result:
OK
See step 2
- Disconnect the transmission wire connector from the transmission.
- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
- Connect the transmission connector to the transmission.
- Disconnect the F1 connector from the ECM.
*a Rear view of wire harness connector
(to ECM) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition F1-3 (SL1+) - F1-2 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω - Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for short)
Tester Connection Condition Specified Condition F1-3 (SL1+) - Body ground Always 10 kΩ or higher F1-2 (SL1-) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE ECM. Refer to COMPONENTS [04/2013 - 08/2015]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- INSPECT SHIFT SOLENOID VALVE SL1
- Remove the shift solenoid valve SL1.
*a Shift Solenoid Valve SL1 - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 5.0 to 5.6 Ω - Connect the a battery positive (+) lead with a 21 W bulb to terminal 1 and a battery negative (-) lead to terminal 2 of the solenoid valve connector, then check the movement of the valve.
OK
The solenoid makes an operating sound.
Result
Proceed to OK NG
Result:
OK
REPAIR OR REPLACE TRANSMISSION WIRE. Refer to COMPONENTS [04/2013 - 08/2015]
Result:
NG
REPLACE SHIFT SOLENOID VALVE SL1. Refer to COMPONENTS [04/2013 - 08/2015]
- Remove the shift solenoid valve SL1.