3RD GR FNCTN

DESCRIPTION
This is an OBD-II self-diagnostic item and not available in TCM self-diagnosis.

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 third gear position as instructed by the TCM. 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 servo piston or brake band, etc.






TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.









ON BOARD DIAGNOSTIC LOGIC
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as follows:

Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (3rd) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

This malfunction will be caused when shift solenoid valve A is stuck closed.


CAUTION:
- Always drive vehicle at a safe speed.
- Be careful not to rev engine into the red zone on the tachometer.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

TESTING CONDITION:
Always drive vehicle on a level road to improve the accuracy of test.

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


With CONSULT









(1) Start engine and select "DATA MONITOR" mode for "A/T" with CONSULT.






(2) Make sure that output voltage of A/T fluid temperature sensor is within the range below.
FLUID TEMP SEN: 0.4 - 1.5V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage (cool down the fluid).

(3) Select "3RD GR FNCTN P0733" of "DTC WORK SUPPORT" mode for "A/T" with CONSULT and touch "START".
(4) Accelerate vehicle to 80 to 95 km/h (50 to 59 MPH) under the following condition and release the accelerator pedal completely.
THROTTLE POSI: Less than 118 (at all times during step 4)
Selector lever: D position (OD "ON")
- Check that "GEAR" shows "4" after releasing pedal.

(5) Depress accelerator pedal steadily with 3.5/8 - 4.5/8 of "THROTTLE POSI" from a speed of 80 to 95 km/h (50 to 59 MPH) until "TESTING" changes to "STOP VEHICLE" or "COMPLETED". (It will take approximately 3 seconds.)
- If the check result NG appears on CONSULT screen, go to "DIAGNOSTIC PROCEDURE".
- If "STOP VEHICLE" appears on CONSULT screen, go to following step.
- Check that "GEAR" shows "3" when depressing accelerator pedal with 3.518 - 4.518 of "THROTTLE POSI".
- If "TESTING" does not appear on CONSULT for a long time, select "SELF-DIAG RESULTS" for "ENGINE". In case a 1st trip DTC other than P0733 is shown, refer to applicable "TROUBLE DIAGNOSIS FOR DTC".

(6) Stop vehicle.






(7) Follow the instruction displayed. (Check for normal shifting referring to the table below.)
(8) Make sure that "OK" is displayed. (If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE".)







DIAGNOSTIC PROCEDURE






COMPONENT INSPECTION
Shift solenoid valve A






Resistance check
Check resistance between terminal (2) and ground.






Operation Check
Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal (2) and ground.