Issue Summary:
- Before or after overhaul, vehicles equipped with the 4L30-E transmission may exhibit a binding sensation on take-off in Drive or on the 2-3 upshift.
- Hyundai vehicles equipped with the F4A42/51 transaxle may come in with complaints of erratic and/or harsh shifting, third-gear failsafe and one or more codes for open or shorted solenoid circuits.
- After overhaul, Mitsubishi vehicles equipped with F4A40 or F4A50 series transaxles may exhibit shuddering engagements or harsh upshifts.
- Before or after overhaul, Mitsubishi vehicles equipped with F4A40 or F4A50 series transaxles may exhibit a flared or harsh upshift into third gear.
Before or after overhaul, vehicles equipped with the 4L30-E transmission may exhibit a binding sensation on take-off when Drive is selected or a binding condition on the 2-3 upshift.
NOTE: This may cause continual band or third-clutch failure.
Bind on take-off
The 2-3 shift solenoid, which is normally open, may be partially closed from debris, causing the 2-3 shift valve to be partially stroked to the right. This connects a line-pressure passage from the manual valve to the release side of the servo and third-clutch apply. This can create a binding condition, because the servo is partially released and the third clutch is partially applied when the servo is supposed to be fully applied. See Figure 1 for partial hydraulic schematics.
Bind on the 2-3 upshift
The 2-3 shift solenoid, which is normally open, may not close quickly, causing the 2-3 shift valve to be in a position that limits servo release and third-clutch pressure, creating a bind because the servo is not fully released when the third clutch is being applied.
Refer to Figure 2 for the location of the 2-3 solenoid, and verify the 2-3 solenoid’s mechanical operation as shown in Figure 3. Ensure that the 2-3 shift valve, which is behind the 2-3 solenoid, is not binding in its bore. Replace the 2-3 solenoid as necessary.
- 3 solenoid (Isuzu part no.) . . . . . . . .8960143240
- 3 solenoid (GM part no.) . . . . . . . . . . .96014224
Hyundai vehicles equipped with the F4A42/51 transaxle may come in with complaints of erratic and/or harsh shifting, third-gear failsafe and codes P0743, P0750, P0755, P0760 and/or P0765 for open or shorted solenoid circuits.
Code P0740 for a TCC-system fault, P0770 for a loss of solenoid power or P1723 for a control relay open or shorted also may be stored. The 20-amp ATM-relay fuse also may be blown.
The most-common cause is the routing of the transmission internal harness. If the internal wiring harness is routed incorrectly as shown in Figure 4, it comes in contact with the detent spring, which eventually cuts through the insulation of one or more wires of the internal harness and results in the complaints above.
Route the internal wiring harness as shown in Figure 5. This will prevent contact with the detent spring and prevent the wiring damage described.
- Transmission internal wiring harness for Sonata, Elantra, Santa Fe and Tiburon . . . . . . .46307-39050
- Transmission internal wiring harness for XG300 & XG350 . . . . . . . . . . . . . . . . . .46308-39550
- Oil-temperature sensor . . . . . . . . . . .46386-39050
After overhaul, vehicles equipped with F4A40/50 series transaxles may exhibit shuddering engagements into gear or harsh upshifts.
The cause may be that during overhaul, the accumulator pistons and springs were installed into the case backward or the springs were misassembled in the accumulator pistons.
Refer to Figure 6 for the spring dimensions for each accumulator piston. Refer to Figure 7 for accumulator identification and placement.
NOTE: Ensure that each accumulator line-up is placed into the case springs first.
Before or after overhaul, vehicles equipped with F4A40 or F4A50 series transaxles may exhibit a flared or harsh upshift into third gear.
The cause may be worn lands where the overdrive-clutch sealing rings ride, creating leakage in the overdrive-clutch circuit.
Refer to Figure 8 to identify the overdrive-clutch sealing rings. Using a feeler gauge, ensure that there is no more than 0.005 inch clearance between the sealing ring and the sealing-ring groove. Replace rear cover as necessary.
July 2004 Issue
Volume 21, No. 7
- 4L30-E: Bind on Take-off or on 2-3 Shift
- Hyundai F4A42/51: Erratic Shift, 3rd-Gear Failsafe, Multiple Codes Stored
- Mitsubishi F4A40/50 Series: Shuddering Engagements or Harsh Shifts
- Mitsubishi F4A40/50 Series: Harsh or Flared 3rd-Gear Upshift
