P0734

P0734 4GR INCORRECT RATIO





Description
This malfunction is detected when the A/T does not shift into 4GR position as instructed by TCM. This is not only caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE

CAUTION:
- " SEE Diagnosis Procedure" must be performed before starting "DTC CONFIRMATION PROCEDURE".
- Never perform "DTC CONFIRMATION PROCEDURE" before completing the repair, which may cause secondary malfunction.
- Always drive vehicle at a safe speed.
1.PRECONDITIONING
If "DTC CONFIRMATION PROCEDURE" is previously conducted, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.
- GO TO 2.
2.CHECK ATF TEMPERATURE
With CONSULT-III
1. Start the engine.
2. Select "ATF TEMP 1" in "Data Monitor" in "TRANSMISSION".
3. Check ATF temperature is in the following range.

ATF TEMP 1 : 20�C (68�F) - 140�C (284�F)

With GST
1. Start the engine.
2. Drive vehicle for approximately 5 minutes in urban areas.
Is ATF temperature within specified range?
YES - GO TO 3.
NO - Drive vehicle to warm ATF or stop engine to cool ATF.
3.CHECK SYMPTOM (PART 1)
With CONSULT-III
1. Select "4TH GR FNCTN P0734" in "DTC & SRT confirmation" in "TRANSMISSION".
2. Drive vehicle with manual mode and maintain the following conditions.

GEAR : 4th
ACCELE POSI : 0.7/8 or more
VEHICLE SPEED : 10 km/h (7 MPH) or more

3. Keep the current driving status for 2 seconds or more if CONSULT-III screen changes from "OUT OF
CONDITION" to "TESTING".

CAUTION:
When "TESTING" is not indicated on CONSULT-III for a long time, check "Self Diagnostic Results" in "TRANSMISSION". When a DTC other than "P0734" is detected, check the DTC. TM257, "DTC Index".
With GST
1. Drive vehicle and maintain the following conditions for 2 seconds or more.

Selector lever : "M" position
Gear position : 4th
Accelerator pedal opening : 0.7/8 or more
Vehicle speed : 10 km/h (7 MPH) or more

2. Check DTC.
Is "OUT OF CONDITION", "STOP VEHICLE" or "COMPLETED RESULT NG" displayed? / Is "P0734" detected?
YES-1 (OUT OF CONDITION)-Perform "Step 3" again.
YES-2 (STOP VEHICLE)-GO TO 4.
YES-3 (COMPLETED RESULT NG)-Go to SEE Diagnosis Procedure.
YES-4 ("P0734" is detected)-Go to SEE Diagnosis Procedure.
NO - GO TO 4.
4.CHECK SYMPTOM (PART 2)
1. Stop vehicle.
2. Drive vehicle in "D" position allowing it to shift from 1GR to 7GR and check shift timing and shift shock.
- INSPECTION END




Diagnosis Procedure
1.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace damaged parts.
2.DETECT MALFUNCTIONING ITEM
Disassemble the A/T assembly to check component parts. Disassembly.
NOTE:
Check the component parts, referring to "Possible cause" in "DTC DETECTION LOGIC". SEE Description SEE DTC Logic, "DTC Logic".
Is the inspection result normal?
YES - Replace control valve & TCM. Removal And Installation.
NO - Repair or replace damaged parts.