Improper Shifting To 1st Gear Position

Description
- This is a "failure" item indicated by the MIL.
- This is indicated when the vehicle is being driven at any gear position other than 1st while the A/T control unit is instructing the A/T to shift the gear in the 1st position.
- The detected item, "A/T 1ST SIGNAL", is not determined as a fault unless the A/T control unit self-diagnosis system is in the "No Failure" condition. When "A/T 1ST SIGNAL" is displayed, it indicates that the gears are not properly shifted. The problem is not caused by electrical failure of the A/T (circuits open or shorted) but by mechanical failure (control valve sticking, improper solenoid valve operation, etc.).

Overall function check

With CONSULT

1. Start engine and warm up ATF.
2. Select "SELF-DIAG RESULTS" mode for ECM with CONSULT.
3. Start vehicle with shift lever in D and throttle opening greater than 1/8 of full throttle. Check that vehicle runs through gear shift of D(1) -> D(2) -> D(3) -> D(4), in accordance with shift schedule.
Refer to shift schedule under "Road Testing".
Preliminary Check

With Generic Scan Tool

1. Start engine and warm up ATF.
2. Start vehicle with shift lever in D and throttle opening greater than 1/8 of full throttle. Check that vehicle runs through gear shift of D(1) -> D(2) -> D(3) -> D(4), in accordance with shift schedule.
Refer to shift schedule under "Road Testing".
Preliminary Check
3. Select "MODE 3" with GST.

Without Scan Tool