Toyota Tundra (2015 year). Manual — part 450
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000W8F0J3X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0748; Pressure Control
Solenoid "A" Electrical (Shift Solenoid Valve SL1); 2015 MY Tundra [08/2014 - ]
DTC
P0748
Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1)
DESCRIPTION
solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated
safely
.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0748
The ECM checks for an open or short in the shift solenoid valve SL1
circuit while driving and shifting between 4th and 5th gear (1-trip
detection logic).
Output signal duty equals 100%.
HINT:
SL1 output signal duty is less than 100% under normal
conditions.
Open or short in shift
solenoid valve SL1
circuit
Shift solenoid valve
SL1
ECM
MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL1 circuit. 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, illuminates the MIL and stores the DTC. Also, the ECM performs the fail-safe
While driving and shifting between 4th and 5th gears, if the ECM detects an open or short in the shift solenoid
valve SL1 circuit, the ECM determines that there is a malfunction
.
MONITOR STRATEGY
Related DTCs
P0748: Shift solenoid valve SL1/Range check
Required sensors/Components
Shift solenoid valve SL1
Duration
1 second
MIL operation
Immediately
TYPICAL ENABLING CONDITIONS
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
The monitor will run whenever the following DTCs are not present
None
Solenoid current cut status
Not cut
Battery voltage
11 V or more
Ignition switch
ON
Starter
OFF
TYPICAL MALFUNCTION THRESHOLDS
Solenoid status from solenoid driver MIC
Fail
COMPONENT OPERATING RANGE
Output signal duty
Less than 100%
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs
.
HINT:
The shift solenoid valve SL1 turns ON/OFF normally when the shift lever is in D:
ECM gear shift command
1st
2nd
3rd
4th
5th
6th
Shift solenoid valve SL1
OFF
OFF
OFF
OFF
ON
ON
PROCEDURE
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
OK
1.
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)
(a) Disconnect the D83 transmission wire connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
16 (SL1+) - 5 (SL1-)
20°C (68°F)
5.0 to 5.6 Ω
16 (SL1+) - Body ground
Always
10 kΩ or higher
5 (SL1-) - Body ground
Always
10 kΩ or higher
Text in Illustration
*a
Component without harness connected
(Transmission Wire)
NG
GO TO STEP 3
2.
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
(a) Disconnect the D74 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
D74-14 (SL1+) - D74-15 (SL1-)
20°C (68°F)
5.0 to 5.6 Ω
D74-14 (SL1+) - Body ground
Always
10 kΩ or higher
D74-15 (SL1-) - Body ground
Always
10 kΩ or higher
Text in Illustration
*a
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
3.
INSPECT SHIFT SOLENOID VALVE SL1
(a) Remove shift solenoid valve SL1.
(b) 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
(c) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an
operating noise.
OK:
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
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