Dtc P0748 Pressure Control Solenoid A Electrical (Shift Solenoid Valve Sl1)
DESCRIPTION
MONITOR DESCRIPTION
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT TRANSMISSION WIRE (SL1)
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
INSPECT SHIFT SOLENOID VALVE SL1
DTC P0748 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) |
DESCRIPTION
Shifting from 1st to 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, S4 and SR which are controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly (Fail safe function).DTC No.
| DTC Detection Condition
| Trouble Area
|
P0748
| - The ECM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shift gears.
(1-trip detection logic)
- Output signal duty equals to 100 %.
(NOTE: SL1 output signal duty is less than 100 % under normal condition.)
| - Open or short in shift solenoid valve SL1 circuit
- Shift solenoid valve SL1
- ECM
|
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. And the ECM performs the fail-safe function and turns the other normal shift solenoid valves "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit.)(COROLLA_ZRE142 RM000000O8L0N2X.html).
MONITOR STRATEGY
Related DTCs
| P0748: Shift solenoid valve SL1/Range check
|
Required sensors/Components
| Shift solenoid valve SL1
|
Frequency of operation
| Continuous
|
Duration
| 1 sec.
|
MIL operation
| Immediate
|
Sequence of operation
| None
|
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.
| None
|
Solenoid current cut status
| Not cut
|
Battery voltage
| 11 V or more
|
Ignition switch
| ON
|
Starter
| OFF
|
Target duty cycle to SL1
| 19% or more
|
TYPICAL MALFUNCTION THRESHOLDS
Solenoid status from IC
| Fail (Open or short)
|
COMPONENT OPERATING RANGE
Output signal duty
| Less than 100%
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Perform the universal trip to clear permanent DTCs (COROLLA_ZRE142 RM000000W770S6X.html).
| 1.INSPECT TRANSMISSION WIRE (SL1) |
Disconnect the transmission wire connector from the transaxle.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Condition
|
6 (SL1+) - 13 (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
|
6 (SL1+) - Body ground
| Always
| 10 kΩ or higher
|
13 (SL1-) - Body ground
| Always
|
| 2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Connect the transmission wire connector to the transaxle.
Disconnect the connector from the ECM.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Condition
|
B31-57 (SL1+) - B31-77 (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
|
B31-57 (SL1+) - Body ground
| Always
| 10 kΩ or higher
|
B31-77 (SL1-) - Body ground
| Always
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.INSPECT SHIFT SOLENOID VALVE SL1 |
Remove the 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 positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.
- OK:
- The solenoid makes an operating sound.
