Workshop Manual

7A1–68
TRANSMISSION CONTROL SYSTEM (4L30–E)
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 (Stuck Off)
Step Action Yes No
1 Were you sent here from the “Powertrain On–Board Diagnostic
(OBD) System Check”?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emission in
Engine section
2 1. Install the scan tool.
2. With the engine “off”, turn the ignition switch “on”.
NOTE: Before clearing DTC(s), use the scan tool to record “Freeze
Frame” and “Failure Records” for reference, as data will be lost
when the “Clear Info” function is used.
3. Record the DTC “Freeze Frame” and “Failure Records”.
4. With the engine operating, apply the brake pedal and select
each transmission range DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the “TR Switch” on
the scan tool?
Go to Step 3
Go to “Range
Switch Logic
Table”
3 1. While the engine is operating, raise the drive wheels.
2. With the transmission in D4 range, use the scan tool to
command 1st, 2nd, and 3rd, and 4th gears while accelerating
the vehicle.
Was a 4–3–3–4 shift pattern detected? (Road testing the vehicle
may be necessary.)
Go to Step 4
Go to Diagnostic
Aids
4 Check the shift solenoid/hydraulic circuit for:
B One or both of the shift solenoids for an internal malfunction.
B Contamination or sediment in one or both of the shift
solenoids.
B Damaged seals on the one or both of the shift solenoids.
Refer to Solenoid (Main Case Valve Body) in Automatic
Transmission (4L30–E) section.
Was a problem found and corrected?
Go to Step 5
Go to Diagnostic
Aids
5 1. After the repair is complete, use the scan tool to select “DTC”,
then “Clear Info” function and road test the vehicle.
2. Review the scan tool “DTC Info”.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table