A/T 1ST SIGNAL

DESCRIPTION
- This is one of the items indicated by the MIL.
- This malfunction will not be detected while the O/D OFF indicator lamp is indicating another self-diagnosis malfunction.
- This malfunction is detected when the A/T does not shift into first gear position 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, etc.




Diagnostic Trouble Code (DTC) confirmation procedure
After the repair, perform the following procedure to confirm the malfunction is eliminated.

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 D1 -> D2 -> D3 -> D4, in accordance with shift schedule. Refer to shift schedule.

OR

With GST
(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 D1 -> D2 -> D3 -> D4, in accordance with shift schedule. Refer to shift schedule.




(3) Select "MODE 7" with GST.

OR

No Tools
(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 D1 -> D2 -> D3 -> D4, in accordance with shift schedule. Refer to shift schedule.
(3) Perform self-diagnosis for ECM.




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Shift Solenoid Valve A and B







Resistance Check
- Check resistance between two terminals.




Operation Check
- Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.