Workshop Manual

TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–69
DTC P0757 Shift Solenoid B Performance (Stuck On)
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 1–2–2–1 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 DTC P0742, P1860, P1870.
B No shift solenoid A DTCs P0753.
B No shift solenoid B DTC 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 not influed cut-off
(to be confirmed).
All of the above conditions have been met and the
combination of condition 1,2 occur two consecutive
times.
Condition 1:
B 3rd gear is commanded for ≥ 1 second
B 40 ≤ Engine Torque ≤ 400 N·m
B Throttle positon ≥ 10%
B –8000 ≤ TCC slip ≤ 8000 rpm
B Transmission out speed ≥ 375 rpm
B Speed ratio ≥ 0.6
B 1.44 ≤ Modeled Ratio ≤ 2.4 for 4 seconds
Condition 2:
B 4th Gear is commanded for ≥ 1 second
B 15 ≤ Engine Torque ≤ 400 N·m
B Trottle position ≥ 10%
B –8000 ≤ TCC slip ≤ 8000 rpm
B Speed ratio ≥ 0.6
B 2.75 ≤ Modeled Ratio ≤ 3.2 for 2 seconds
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 cause more
than one shift to occur.