DTC P0734:00 [FN4A-EL]

id050218818100

DTC P0734:00

Gear 4 incorrect ratio

DETECTION CONDITION

•  The PCM detects that revolution ratio of the input revolution to output revolution is more than 1.249 or less than 0.6 for 1 s when the following conditions are met.

―  4GR

―  Vehicle speed: more than 31 km/h {19 mph}

•  The PCM detects that revolution ratio of the input revolution to output revolution is between 0.91—1.09 for 5 s when the following conditions are met.

―  4GR

―  Vehicle speed: more than 27 km/h {17 mph}

―  TCC operation: Off

Diagnostic support note

•  The MIL does not illuminate.

•  The AT warning light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  PENDING CODE is not available.

•  FREEZE FRAME DATA is not available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  Deteriorated ATF

•  ATF level low

•  Solenoid valve malfunction

―  Pressure control solenoid

―  Shift solenoid A

―  Shift solenoid B

―  Shift solenoid C

•  Line pressure malfunction

•  Stall speed malfunction

•  Forward clutch slipping

•  2-4 brake band slipping

•  3-4 clutch slipping

•  Control valve body malfunction

•  PCM malfunction

DTC P0734:00	Gear 4 incorrect ratio
DETECTION CONDITION	• The PCM detects that revolution ratio of the input revolution to output revolution is more than 1.249 or less than 0.6 for 1 s when the following conditions are met. ― 4GR ― Vehicle speed: more than 31 km/h {19 mph} • The PCM detects that revolution ratio of the input revolution to output revolution is between 0.91—1.09 for 5 s when the following conditions are met. ― 4GR ― Vehicle speed: more than 27 km/h {17 mph} ― TCC operation: Off Diagnostic support note • The MIL does not illuminate. • The AT warning light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • PENDING CODE is not available. • FREEZE FRAME DATA is not available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Deteriorated ATF • ATF level low • Solenoid valve malfunction ― Pressure control solenoid ― Shift solenoid A ― Shift solenoid B ― Shift solenoid C • Line pressure malfunction • Stall speed malfunction • Forward clutch slipping • 2-4 brake band slipping • 3-4 clutch slipping • Control valve body malfunction • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	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.
1		No	Go to the next step.
2	INSPECT ATF CONDITION • Inspect the ATF condition. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].) • Is it normal?	Yes	Go to the next step.
2		No	Replace the ATF, then go to Step 9. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL])
3	INSPECT ATF LEVEL • Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].) • Is it normal?	Yes	Go to the next step.
3		No	Add ATF to the specified level, then go to Step 9. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL])
4	INSPECT SOLENOID VALVE • Inspect the following solenoid valves: (See SOLENOID VALVE INSPECTION [FN4A-EL].) ― Pressure control solenoid ― Shift solenoid A ― Shift solenoid B ― Shift solenoid C • Is there any malfunction?	Yes	Replace the solenoid valve, then go to Step 9. (See SOLENOID VALVE REMOVAL/INSTALLATION [FN4A-EL].)
4		No	Go to the next step.
5	INSPECT LINE PRESSURE • Perform the “Line Pressures Test”. (See MECHANICAL SYSTEM TEST [FN4A-EL].) • Is there any malfunction?	Yes	Repair or replace malfunctioning part according to test result, then go to Step 9.
5		No	Go to the next step.
6	INSPECT STALL SPEED • Perform the “Stall Test”. (See MECHANICAL SYSTEM TEST [FN4A-EL].) • Is there any malfunction?	Yes	Repair or replace malfunctioning part according to test result, then go to Step 9.
6		No	Go to the next step.
7	INSPECT TURBINE SPEED WHILE DRIVING VEHICLE • Connect the M-MDS. • Start the engine. • Measure the PID “TSS” while driving vehicle under the following conditions: ― Selector lever position: D range ― Gear position: 4GR ― Vehicle speed: 80 km/h {50 mph} • Is the PID “TSS“ approx.2,250 RPM?	Yes	Go to Step 9.
7		No	Go to the next step.
8	INSPECT CONTROL VALVE BODY • Remove the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [FN4A-EL].) • Disassemble the control valve body. • Inspect the following parts: ― Shift valve ― Return spring ― Hydraulic passage • Is there any malfunction?	Yes	Repair or replace malfunctioning part according to inspection result, then go to next step.
8		No	Replace the transaxle, then go to the next step. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FN4A-EL].)
9	VERIFY TROUBLESHOOTING OF DTC P0734:00 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. Drive the vehicle under the following conditions for 1 s or more. ― 4GR ― Vehicle speed: more than 31 km/h {19 mph} 2. Drive the vehicle under the following conditions for 5 s or more. ― 4GR ― Vehicle speed: more than 27 km/h {17 mph} ― TCC operation: Off • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [FN4A-EL].)
9		No	Go to the next step.
10	VERIFY NO DTC HAS BEEN PRESENTED • Perform the “Reading DTCs Procedure”. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FN4A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FN4A-EL].)
10		No	DTC troubleshooting completed.