2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 576
Diagnosis Procedure
1.CHECK INTERMITTENT INCIDENT
See: Testing and Inspection/Initial Inspection and Diagnostic Overview/How to Perform Efficient Diagnosis For an Electrical Incident.
Is the inspection result normal?
YES - Replace A/T assembly. See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Service and Repair/Removal and
Replacement/7AT RE7R01A/Transmission Assembly/Exploded View.
NO - Repair or replace damaged parts.
5AT RE5R05A
P0731 1GR INCORRECT RATIO
Description
This malfunction is detected when the A/T does not shift into 1GR 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.
On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0731" with CONSULT-III or 18th judgment flicker without CONSULT-III is detected when TCM detects any
inconsistency in the actual gear ratio.
Possible Cause
- Input clutch solenoid valve
- Front brake solenoid valve
- Direct clutch solenoid valve
- High and low reverse clutch solenoid valve
- Each clutch and brake
- Hydraulic control circuit
DTC Confirmation Procedure
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch OFF and wait at least 10 seconds before
performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Start the engine and select "DATA MONITOR" in "TRANSMISSION".
2. Make sure that "ATF TEMP 1" is within the following range.
ATF TEMP 1: 20锟斤拷C (68锟斤拷F) - 140锟斤拷C (284锟斤拷F)
If out of range, drive vehicle to warm ATF or stop engine to cool ATF.
3. Select "1ST GR FNCTN P0731" in "DTC & SRT CONFIRMATION" in "TRANSMISSION".
4. Drive vehicle and maintain the following conditions.
MANU MODE SW: ON
GEAR: "1" position
ACCELE POSI: 0.6/8 or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ENGINE SPEED: INPUT SPEED - 50 rpm or more
INPUT SPEED: 300 rpm or more
5. Keep the current driving status for at least 5 consecutive seconds if CONSULT-III screen changes from "OUT OF CONDITION" to
"TESTING".
CAUTION:
If "TESTING" does not appear on CONSULT-III for a long time, select "SELF-DIAG RESULTS". In case a 1st trip DTC other than
"P0731" is shown, refer to " Road Test".
- Perform See: Powertrain Management/Transmission Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/5AT
RE5R05A/Trouble Diagnosis/CONSULT-III Function (Transmission) when not shifted from the 1GR to 5GR. (Neither "OK" nor "NG" are
indicated.)
WITH GST
1. Start the engine.
2. Drive vehicle for approximately 5 minutes in urban areas.
3. Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.
