DESCRIPTION
Changing from 1st to 6th is performed by the TCM turning shift solenoid valves
SL1, SL2, SL3, SL4 and SL on and off. If an open or short circuit occurs in any
of the shift solenoid valves, the TCM controls the remaining normal shift solenoid
valves to allow the vehicle to be operated (See page
).
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
P0748 |
The TCM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gears. (1-trip detection logic)
|
|
MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. The TCM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the TCM stops sending current to the circuit.)
While driving and shifting between 4th and 5th gears, if the TCM detects an open
or short in the shift solenoid valve SL1 circuit, the TCM 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
All
The monitor will run whenever the following DTCs are not present |
None |
Ignition switch |
ON |
Starter |
OFF |
Battery voltage |
12 V or more |
Battery voltage |
10 V or more and less than 12 V |
Target current |
Less than 0.75 A |
Battery voltage |
8 V or more |
Target current |
0.25 A or more |
TYPICAL MALFUNCTION THRESHOLDS
Condition (A) and (B)
Output duty cycle |
100% or more |
Output duty cycle |
0% or less |
COMPONENT OPERATING RANGE
Output duty cycle |
More than 3% and less than 100% |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page
).
HINT:
The following table shows normal operation of the shift solenoid valve SL1 when the shift lever is in D:
TCM commanded gear |
1st |
2nd |
3rd |
4th |
5th |
6th |
Shift solenoid valve SL1 |
ON |
ON |
ON |
ON |
OFF |
OFF |
PROCEDURE
1. |
INSPECT TRANSMISSION WIRE (SL1) |
(a) Remove the TCM from the transaxle. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
14 (SL1+) - 13 (SL1-) |
20°C (68°F) |
5.0 to 5.6 Ω |
14 (SL1+) - Body ground |
Always |
10 kΩ or higher |
13 (SL1-) - Body ground |
Always |
10 kΩ or higher |
14 (SL1+) - All other terminals except 13 (SL1-) |
Always |
10 kΩ or higher |
13 (SL1-) - All other terminals except 14 (SL1+) |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE TCM |
|
2. |
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 |
*1 |
Shift Solenoid Valve SL1 |
(c) Connect a battery positive (+) lead with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
OK | ![]() |
REPLACE TRANSMISSION WIRE |
NG | ![]() |
REPLACE SHIFT SOLENOID VALVE SL1 |
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...
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Torque:
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