Isuzu 2000 Trooper Workshop Manual page 1652

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
1 Were you sent here from the "Powertrain On–Board Diagnostic
(OBD) System Check"?
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 D1, D2, D3, D4, N, R, and P.
Does each selected transmission range match the "TR Switch" on
the scan tool?
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 1st gear commanded and not achieved, or 4th gear
commanded and other than 4th gear occurred? (Road testing the
vehicle may be necessary.)
4 Check the shift solenoid/hydraulic circuit for:
D One or both of the shift solenoids for an internal malfunction.
D Contamination or sediment in one or both of the shift
solenoids.
D 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?
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?
Action Yes
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Go to Step 2 Engine section
Go to "Range
Switch Logic
Go to Step 3
Go to Diagnostic
Go to Step 4
Go to Diagnostic
Go to Step 5
Begin diagnosis
again
Repair verified
Go to Step 1 Exit DTC table
No
Table"
Aids
Aids