P0756

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 a non 2-3 upshift and a non 1st gear when 1st gear is commanded, or 1st gear when 4th gear is commanded. This is a Type "B" DTC.

Conditions For Setting The DTC
- No TP DTCs P0122 or P0123.
- No 055 DTCs P0722 or P0723.
- No TCC solenoid DTC P0742, P1860.
- No shift solenoid DTCs P0753, P0758.
- No MAP DTCs, P0106, P1106, P0107, P1107, or P0108.
- Vehicle speed is greater than 10 km/h (6.25 mph).
- Gear range is D4.
- Engine vacuum is between 0 and 70 kPa.
- Engine speed is less than 8000 rpm.
- Transmission fluid temperature is between 20 and 125°C (68°and 257°F).
- TCC is "off".
All of the above conditions have been met and either one of the following fail conditions occurs:
- The solenoid is stuck "on" and conditions 3 and 4 are present two consecutive times.
- The solenoid is stuck "off" and conditions 1 and 3 are present two consecutive times.

Condition 1:
- TP angle is greater than 45%.
- 1st gear is commanded for 3 seconds.
- Speed ratio is between 0.5 and 2.65 (speed ratio is engine speed + output speed).
- Transmission output speed is between 320 and 2,000 rpm.
- TCC slip speed is between -200 and -4000 rpm for 1.8 seconds.

Condition 2:
- Not used.

Condition 3:
- Commanded 2-3 shift.
- TP angle is between 10 and 60%.
- TP angle is within +1-5%.
- 3rd gear is commanded for 2 second.
- 3rd gear speed ratio is greater than the last 2nd gear speed ratio minus 0.05.
- 3rd gear TCC slip speed is greater than or equal to the last 2nd gear TCC slip speed plus 520 rpm for 1.8 seconds.
- Discontinue test if time since shift commanded is 5.57 seconds.

Condition 4:
- TP angle is greater than 10%.
- 4th gear is commanded for 1 second.
- Speed ratio is between 2.0 and 4.0.
- Transmission output speed is between 0 and 8192 rpm.
- TCC slip speed is between 2000 and 5000 rpm for 3 seconds.

Action Taken When the DTC Sets
- Maximum line pressure.
- The PCM will illuminate the Malfunction Indicator Lamp (MIL) and CHECK TRANS LAMP

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 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
- A shift solenoid A electrical failure could also set a shift solenoid B performance DTC P0756.
- A shift solenoid B electrical failure could also set a shift solenoid B performance DTC P0756.

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 for selected gear ratio vs. a ratio not obtainable under normal driving conditions.





DTC P0756 Shift Solenoid B Performance Without Input Speed