Workshop Manual

TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–67
DTC P0756 Shift Solenoid B Performance (Stuck Off)
D07RT011
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
B No ETC DTCs.
B No OSS DTCs P0722 or P0723.
B No TCC solenoid DTCs P0742, P1860, P1870.
B No shift solenoid DTCs P0753, P0758.
B Gear range is D4.
B Output speed is greater than 375 rpm.
B Transmission fluid temperature is between 20° and
130°C (68° and 266°F).
B No range code P0705, P0706.
B No torque code (to be confirmed).
B Engine run for more 0 seconds and influed cut-off (to
be confirmed).
All the above conditions have been met and the
combination of condition 1, 2 occur two consecutive
times.
Condition 1:
B 1st gear is commanded for ≥ 1 second
B 40 ≤ Engine Torque ≤ 400 N·m
B Throttle position ≥ 10 %
B –2300 ≤ TCC Slip ≤ 200 rpm.
B Transmission output speed ≥ 400 rpm
B Speed ratio ≥ 0.3
B 0.60 ≤ Modeled Ratio ≤ 1.49 for 1 second.
Condition 2:
B 2nd gear is commanded for ≥ 1 second
B 40 ≤ Engine Torque ≤ 400 N·m
B Throttle position ≥ 10 %
B –8000 ≤ TCC Slip ≤ 8000 rpm.
B Speed ratio ≥ 0.6
B 0.92 ≤ Modeled Ratio ≤ 1.5 for 0.687 second.
Action Taken When the DTC Sets
B Maximum line pressure.
B For lamp illuminate refer to DTC type definition (type
B).
B Turn Force Motor OFF.
Conditions For Clearing The MIL/DTC
B The PCM will turn off the MIL and CHECK TRANS
Lamp after three consecutive ignition cycles without a
failure reported.
B The DTC can be cleared from the PCM history by
using a scan tool.
B The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.
B 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
B Verify that the transmission meets the specifications
in the 4L30-E shift speed chart.
B Other internal transmission failures may allow more
than one shift to occur.