DTC P0729:00 [AW6A-EL, AW6AX-EL]SM2445319
DTC P0729:00 [AW6A-EL, AW6AX-EL]

id0502j7822000

DTC P0729:00

Gear 6 incorrect (incorrect gear ratio detected)
DETECTION CONDITION
• Incorrect gear ratio is detected when driving in D range, 6GR, ATF temperature is 20 °C {68 °F} or more, and accelerator opening angle is 10% or more.
Diagnostic support note:
• The MIL illuminates if the TCM detects the above malfunction condition during the first drive cycle.
• The AT warning light illuminates if the TCM detects the above malfunction condition during the first drive cycle.
• PENDING CODE is not available.
• FREEZE FRAME DATA is available.
• The DTC is stored in the TCM memory.
POSSIBLE CAUSE
• Deteriorated ATF
• ATF level low
• Line pressure malfunction
― Oil pump malfunction
― Control valve stuck
• Stall speed malfunction
― B1 brake slipping
― C2 clutch slipping
• Solenoid valve malfunction
― Line pressure control solenoid stuck
― Shift solenoid C stuck
― Shift solenoid E stuck
• TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded on the repair order?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT ATF CONDITION
• Inspect the ATF condition. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AW6A-EL, AW6AX-EL].)
• Is it normal?
Yes
Go to the next step.
No
Replace the ATF, then go to Step 8.
4
INSPECT ATF LEVEL
• Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AW6A-EL, AW6AX-EL].)
• Is it normal?
Yes
Go to the next step.
No
Add ATF to the specified level, then go to Step 8.
5
INSPECT LINE PRESSURE
• Perform the “Line Pressures Test”. (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-EL].)
• Is there any malfunction?
Yes
All ranges: Replace the oil pump, then go to Step 8.
Any ranges: Replace the control valve body, then go to Step 8.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
No
Go to the next step.
6
INSPECT STALL SPEED
• Perform the “Stall Test”. (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-EL].)
• Is there any malfunction?
Yes
Replace the automatic transaxle, then go to Step 8.
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
No
Go to the next step.
7
INSPECT SOLENOID VALVE
• Inspect the following solenoid valves: (See SOLENOID VALVE INSPECTION [AW6A-EL, AW6AX-EL].)
― Line pressure control solenoid
― Shift solenoid C
― Shift solenoid E
• Is there any malfunction?
Yes
Replace malfunctioning part according to test result, then go to the next step.
No
Go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0729:00 COMPLETED
• Make sure to reconnect all the disconnected connectors.
• Clear the DTC using the M-MDS.
• Perform the following procedure to ensure that the DTC has been resolved:
1. Start the engine.
2. Warm up the engine to normal operating temperature.
3. Drive the vehicle in D range, at 40 km/h {25 mph} or more for 2 s or more.
• Is the same DTC present?
Yes
Replace the TCM, then go to the next step.
(See TCM REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
No
Go to the next step.
9
VERIFY NO DTC HAS BEEN PRESENTED
• Perform the “Reading DTCs Procedure”. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [AW6A-EL, AW6AX-EL].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [AW6A-EL, AW6AX-EL].)
No
DTC troubleshooting completed.