Improper Shifting to 4th Gear Pos. or Torque Conv. Clutch Op.

Description
- This is one of the items indicated by the MIL.
- This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis malfunction.
- This malfunction is detected when the A/T does not shift into fourth gear position or the torque converter clutch does not lock up as instructed by the A/T control unit. This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation, malfunctioning oil pump or torque converter clutch, etc.

Inspection

Part 1:

Part 2:

Part 3:

Overall function check
After the repair, perform the following procedure to confirm the malfunction is eliminated.

Vehicle Speed When Shifting Gears:

Vehicle Speed When Performing Lock-up:

With Consult

1. Start engine and warm up ATF.
2. Select "SELF-DIAG RESULTS" mode for ECM with CONSULT.
3. Start vehicle with selector lever in D and throttle opening halfway. Check that vehicle runs through gear shift of D(1) -> D(2) -> D(3) -> D(4) -> D(4) lock-up, in accordance with shift schedule. Refer to shift schedule.

OR

With Generic Scan Tool

1. Start engine and warm up ATF.
2. Start vehicle with selector lever in D and throttle opening halfway. Check that vehicle runs through gear shift of D(1) -> D(2) -> D(3) -> D(4) -> D(4) lock-up, in accordance with shift schedule. Refer to shift schedule.
3. Select "MODE 3" with GST.

OR

With No Tool