Toyota Sequoia (2005). Manual — part 202
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–603
797
DTC
P0748
Pressure Control Solenoid ”A” Electrical
(Shift Solenoid Valve SL1)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ”ON” and ”OFF” operation of the shift solenoid valves
SL1, SL2, S1, S2 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 (See page
).
DTC No.
DTC Detection Condition
Trouble Area
P0748
ECM checks for an open or short circuit in shift solenoid valves
SL1 (1–trip detection logic)
(a) When solenoid, duty ratio equal to 100%
(b) When solenoid is not energized, duty ratio is less than 3%
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 gearshift
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 per-
forms 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.)
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 there is a malfunction (See page
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
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present.
See page
Battery voltage
10 V or more
–
CPU commanded duty
–
Less than 75%
Ignition switch
ON
Switch
OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria
Threshold
Output signal duty
100%
DIDJB–01
D14168
Electronically Controlled
Transmission Solenoid
E7
ECM
L
R–B
19
18
SL1+
SL1–
12
4
L
R
E1
SL1+
SL1–
+B
CPU
E7
DI–604
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
798
COMPONENT OPERATING RANGE
Parameter
Standard value
Output signal duty
Less than 100%
WIRING DIAGRAM
ECM command gearshift
Shift solenoid valve SL1
1st
2nd
3rd
4th
5th
OFF
OFF
OFF
ON
OFF
1
15
2
3
4
5
6
7
8
9
10
11
12
13
14
D11994
SL1
–
SL1
+
E1
Transmission Wire Side:
(Connector Front View):
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–605
799
INSPECTION PROCEDURE
HINT:
The shift solenoid valve SL1 is turned on/off normally when the shift lever is in the D position:
1
Inspect transmission wire.
PREPARATION:
Disconnect the transmission wire connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
20
C (68
F)
12 (SL1+) – 4 (SL1–)
5.0 to 5.6
Ω
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
12 (SL1+) – Body ground
10 k
Ω
or higher
4 (SL1–) – Body ground
↑
NG
Go to step 3.
OK
D14166
ECM:
SL1+
SL1–
E8
E7
E6
E5
E4
DI–606
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
800
2
Check harness and connector (Transmission wire – ECM)
PREPARATION:
(a)
Connect the transmission wire connector.
(b)
Disconnect the ECM connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
20
C (68
F)
E7 – 19 (SL1+) – E7 – 18 (SL1–)
5.0 to 5.6
Ω
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
E7 – 19 (SL1+) – Body ground
10 k
Ω
or higher
E7 – 18 (SL1–) – Body ground
↑
NG
Repair or replace the harness or connector
(See page
).
OK
Replace the ECM (See page
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