DESCRIPTION
Changing from 1st to 6th is performed by the ECM turning shift solenoid valves SL1, SL2, SL3 and SL4 on and off. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated (See page ).
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
P0748 |
An open or short circuit (output signal duty is 0% or 100%) is detected by the ECM in the shift solenoid valve SL1 circuit while driving and shifting gears (SL1 output signal duty is more than 3% and less than 100% under normal conditions) (1 trip detection logic). |
|
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 or off. When there is an open or short circuit in any of the shift solenoid valve circuits, the ECM detects the problem and illuminates the MIL and stores the DTC. The ECM 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 ECM stops sending current to the circuit.)
While driving and shifting 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 |
Immediately |
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever the following DTCs are not stored |
None |
Solenoid current cut status |
Not cut |
Ignition switch |
ON |
Starter |
OFF |
Battery voltage |
12 V or higher |
Battery voltage |
10 V or higher, and below 12 V |
Target current |
Below 0.75 A |
Battery voltage |
8 V or higher |
Target current |
0.25 A or higher |
TYPICAL MALFUNCTION THRESHOLDS
One of the following conditions is met: Condition (A), (B) or (C)
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:
HINT:
ECM commanded gear |
1st |
2nd |
3rd |
4th |
5th |
6th |
Shift solenoid valve SL1 |
ON |
ON |
ON |
ON |
OFF |
OFF |
PROCEDURE
1. |
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1) |
(a) Disconnect the E1 transmission wire connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
25 (SL1+) - 26 (SL1-) |
20°C (68°F) |
5.0 to 5.6 Ω |
25 (SL1+) - Body ground |
Always |
10 kΩ or higher |
26 (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 ECM connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
E19-9 (SL1+) - E19-8 (SL1-) |
20°C (68°F) |
5.0 to 5.6 Ω |
E19-9 (SL1+) - Body ground |
Always |
10 kΩ or higher |
E19-8 (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 |
(a) Remove shift solenoid valve SL1 (See page ). |
|
(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:
Measurement Condition |
Specified Condition |
---|---|
|
Valve moves and makes an operating noise |
*1 |
Shift Solenoid Valve SL1 |
OK |
REPLACE TRANSMISSION WIRE |
NG |
REPLACE SHIFT SOLENOID VALVE SL1 |
Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION
When the air conditioning amplifier assembly is turned on, a magnetic clutch
on signal is sent from the MGC terminal of the air conditioning amplifier assembly.
Then, the MG CLT relay turns on to operate the magnetic clutch assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NO ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for both the RH and LH sides.
The procedure described below is for the LH side.
PROCEDURE
1. PRECAUTION
CAUTION:
Be sure to read Precaution thoroughly before servicing (See page
).
NOTICE:
After turning the ign ...
Parking Brake Switch Circuit
DESCRIPTION
This circuit is from the parking brake switch assembly to the radio and display
receiver assembly.
WIRING DIAGRAM
PROCEDURE
1.
CHECK VEHICLE SIGNAL
(a) Display the "Vehicle Signal Check Mode" screen (See page
).
...