DESCRIPTION
Shifting from 1st to 5th is performed in combination with the 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 one 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 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. |
|
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. Then 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.
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
All
The monitor will run whenever the following DTCs are not stored |
None |
Battery voltage |
8 V or higher |
Ignition switch |
ON |
Starter |
OFF |
Solenoid current cut status |
Not cut |
Battery voltage |
11 V or higher |
Target duty cycle |
19% or more |
Target duty cycle |
100% |
TYPICAL MALFUNCTION THRESHOLDS
Solenoid status from solenoid driver MIC |
Failure |
COMPONENT OPERATING RANGE
Output signal duty |
Less than 100% |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page ).
HINT:
The shift solenoid valve SL1 is turned ON/OFF normally when the shift lever is in D.
ECM gear shift command |
1st |
2nd |
3rd |
4th |
5th |
Shift solenoid valve SL1 |
OFF |
OFF |
OFF |
OFF |
ON |
PROCEDURE
1. |
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1) |
(a) Disconnect the B32 transmission wire connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
12 (SL1+) - 4 (SL1-) |
20°C (68°F) |
5.0 to 5.6 Ω |
12 (SL1+) - Body ground |
Always |
10 kΩ or higher |
4 (SL1-) - Body ground |
Always |
10 kΩ or higher |
*a |
Component without harness connected (Transmission Wire) |
NG |
GO TO STEP 3 |
|
2. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
(a) Disconnect the B38 ECM connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B38-33 (SL1+) - B38-32 (SL1-) |
20°C (68°F) |
5.0 to 5.6 Ω |
B38-33 (SL1+) - Body ground |
Always |
10 kΩ or higher |
B38-32 (SL1-) - Body ground |
Always |
10 kΩ or higher |
*a |
Rear view of wire harness connector (to ECM) |
OK |
REPLACE ECM |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
3. |
INSPECT SHIFT SOLENOID VALVE SL1 |
OK |
REPAIR OR REPLACE TRANSMISSION WIRE |
NG |
REPLACE SHIFT SOLENOID VALVE SL1 |
System Description
SYSTEM DESCRIPTION
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