P0756

DTC P0756 Shift Solenoid B Performance (Stuck Off)

Circuit Description
The shift solenoid B is used to control fluid flow acting on the 2-3 shift valves. The solenoid is a normally open exhaust valve that is used with the shift solenoid A to allow four different shift combinations.
This DTC detects when there is only a 4-3-3-4 shift pattern depending on the state of the mechanical failure instead of a 1-2-3-4 shift pattern. This is a type "B" DTC.

Conditions For Setting The DTC
^ No ETC DTCs.
^ No OSS DTCs P0722 or P0723.
^ No TCC solenoid DTCs P0742, P1360, P1870.
^ No shift solenoid DTCs P0753, P0758.
^ Gear range is D4.
^ Output speed is greater than 375 rpm.
^ Transmission fluid temperature is between 20° and 130°C (68° and 266°F).
^ No range code P0705, P0706.
^ No torque code (to be confirmed).
^ Engine run for more 0 seconds and influed cut-off (to be confirmed).

All the conditions have been met and the combination of condition 1, 2 occur two consecutive times.

Condition 1:
^ 1st gear is commanded for >/= 1 second
^ 40 <\= 400 Nm
^ Throttle position >/= 10 %
^ -2300
^ Transmission output speed >/= 400 rpm
^ Speed ratio >/= 0.3
^ 0.60 .

Condition 2:
^ 2nd gear is commanded for >/= 1 second
^ 40 <\= 400 Nm
^ Throttle position >\= 10 %
^ 000
^ Speed ratio >/= 0.6
^ 0.92 .

Action Taken When the DTC Sets
^ Maximum line pressure.
^ For lamp illuminate refer to DTC type definition (type B).
^ Turn Force Motor OFF.

Conditions For Clearing The MIL/DTC
^ The PCM will turn off the MIL and CHECK TRANS Lamp after three consecutive ignition cycles without a failure reported.
^ The DTC can be cleared from the PCM history by using a scan tool.
^ The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a failure reported.
^ The PCM will cancel the DTC default actions when the fault no longer exists and the ignition is cycled "off" long enough to power down the PCM.

Diagnostic Aids
^ Verify that the transmission meets the specifications in the 4L30-E shift speed chart.
^ Other internal transmission failures may allow more than one shift to occur.

Test Description
The numbers refer to the step numbers on the diagnostic chart:
2. This test checks the function of the range switch (mode switch).
3. This test checks for selected gear ratio vs. a ratio not obtainable under normal driving conditions.





DTC P0756 Shift Solenoid B Performance (Stuck Off)