Nissan Versa (N17): 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	Trouble diagnosis name	DTC detection condition	Possible causes
P0734	Gear 4 Incorrect Ratio	Under the following diagnosis conditions, the gear ratio is 2.804 − 2.918 (1GR ratio), 1.531 − 1.593 (2GR ratio), or 0.980 − 1.020 (3GR ratio) continuously for 2 seconds or more. - Diagnosis condition - Shifting is not in progress. - Input speed: 300 rpm or more - Output speed: 300 rpm or more - Engine speed: (Input speed - 50 rpm) or more - Selector lever: D position - Gear: 4GR - Throttle position: 0.7/8.0 or more	- Clutches and brakes - Hydraulic circuit - Control valve assembly

DTC CONFIRMATION PROCEDURE

CAUTION:

• "TM, "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.PREPARATION BEFORE WORK

If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.CHECK DTC DETECTION

With CONSULT

1. Select "4TH GR FNCTN P0734" in "DTC Work Support" in "TRANSMISSION".
2. Drive vehicle according to the following conditions.

Selector lever : D position

Gear : 4GR

Accelerator pedal position : 0.7/8 or more

Vehicle speed : 20 km/h (13 MPH) or more

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

CAUTION: When "TESTING" is not indicated on CONSULT for a long time, check "Self Diagnostic Results" in "TRANSMISSION". When a DTC other than "P0734" is detected, check the DTC. Refer to TM, "DTC Index".

With GST

    1.  Drive vehicle and maintain the following conditions for 2 seconds or more.

Selector lever : D position

Gear : 4GR

Accelerator pedal position : 0.7/8 or more

Vehicle speed : 20 km/h (13 MPH) or more

    2.  Check the first trip DTC.

Is "OUT OF CONDITION", "STOP VEHICLE", or "COMPLETED RESULT NG" displayed? / Is "P0734" detected?

YES-1 (OUT OF CONDITION.)>>Perform "step 2" again.

YES-2 (STOP VEHICLE.)>>GO TO 3.

YES-3 (COMPLETED RESULT NG)>>Go to TM, "Diagnosis Procedure".

YES-4 ("P0734" is detected.)>>Go to TM, "Diagnosis Procedure".

NO >> GO TO 3.

3.CHECK SYMPTOM

1. Stop the vehicle.
2. Drive vehicle in "D" position allowing it to shift from 1GR to 4GR and check shift timing and shift shock.

>> INSPECTION END

Diagnosis Procedure

1.MALFUNCTION CAUSE SIMULATION TEST

Refer to GI, "Intermittent Incident".

Is the check result normal?

YES >> Replace the transaxle assembly. Refer to TM, "Removal and Installation".

NO >> Repair or replace the malfunctioning parts.