P0752

DTC P0752 SHIFT SOLENOID A PERFORMANCE (STUCK ON)





Circuit Description
The shift solenoid A is used to control fluid flow acting on the 1-2 and 3-4 shift valves. The solenoid is a normally close exhaust valve that is used with the shift solenoid B to allow four different shifting combinations.
The DTC detects when there is only a 2-2-3-3 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 DTC P0742, P1860, P1870.
- No shift solenoid A DTC P0753.
- No shift solenoid B DTC P0758.
- Gear range is D4.
- Transmission temperature is between 20° and 130°C (68° and 266°F).
- Output speed is greater than 375 rpm.
- No range code P0705, P0706.
- No torque code (to be confirmed)
- Engine run for more than 0 seconds and not influed cut-off (to be confirmed).
All the above conditions have been met and the combination of conditions 1, 2 occur two consecutive times.

Condition 1
- 1st gear is commanded for > 1 second.
- 40 < Engine Torque < 400 Nm
- Speed ratio > 0.3
- Throttle position > 10%
- 800 < TCC Slip < 8000 rpm
- Transmission out speed > 375 rpm
- 1.5 < Modeled Ration < 2.4 for 0.687 seconds.

Condition 2
- 4th gear is commanded for > 1 second.
- 40 < Engine Torque < 400 Nm
- Throttle position > 10%
- -8000 < TCC Slip < 8000 rpm
- Speed ratio > 0.6
- 0.92 < Modeled Ratio < 1.5 for 7 seconds.

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 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 warmup 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 cause more than one shift to occur.

Test Description
The numbers below 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 that the scan tool commanded all shifts, all shifts solenoids responded correctly, but all the shifts did not occur.

DTC P0752 Shift Solenoid A Performance (Stuck On)





Step 1





Step 2 - 3





Step 4 - 5