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 1.277 or less than 0.57 when the following conditions are met.

―  4GR

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

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

―  4GR

―  Vehicle speed: more than 28 km/h {17 mph}

―  TCC operation: Off

Diagnostic support note:

•  This is a continuous monitor (CCM).

•  The MIL does not illuminate.

•  The HOLD indicator light flashes 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

•  Shift solenoids A, B or C malfunction

•  Line pressure low

•  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 1.277 or less than 0.57 when the following conditions are met. ― 4GR ― Vehicle speed: more than 27 km/h {17 mph} • The PCM detects that revolution ratio of the input revolution to output revolution is between 0.91—1.09 when the following conditions are met. ― 4GR ― Vehicle speed: more than 28 km/h {17 mph} ― TCC operation: Off Diagnostic support note: • This is a continuous monitor (CCM). • The MIL does not illuminate. • The HOLD indicator light flashes 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 • Shift solenoids A, B or C malfunction • Line pressure low • 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.
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 8. (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 8. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL].)
4	INSPECT SHIFT SOLENOID A AND D • Perform operation inspection. (See SOLENOID VALVE INSPECTION [FN4A-EL].) • Verify the click sound of shift solenoid A and D when applying B+. Note • The click from solenoid D is barely audible. Remove solenoids to correctly inspect if necessary. • Was a click heard from solenoids?	Yes	Go to the next step.
4		No	Replace the shift solenoid that you could not hear a click sound, then go to Step 8. (See SOLENOID VALVE REMOVAL/INSTALLATION [FN4A-EL].)
5	INSPECT LINE PRESSURE • Measure the line pressures. (See MECHANICAL SYSTEM TEST [FN4A-EL].) • Are the line pressures within the specifications?	Yes	Go to the next step.
5		No	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 [FN4A-EL].) (See CONTROL VALVE BODY INSTALLATION [FN4A-EL].)
6	INSPECT STALL SPEED • Measure the stall speed in D range. (See MECHANICAL SYSTEM TEST [FN4A-EL].) • Is the stall speed within the specification?	Yes	Go to the next step.
6		No	Replace the transaxle, then go to Step 8. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FN4A-EL].)
7	INSPECT FREQUENCY OF INPUT/TURBINE SPEED SENSOR WHEN 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.2,150 RPM?	Yes	Go to the next step.
7		No	Replace the control valve body, then go to the next step. (See CONTROL VALVE BODY REMOVAL [FN4A-EL].) (See CONTROL VALVE BODY INSTALLATION [FN4A-EL].)
8	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: ― Warm up the engine. ― Shift the selector lever to D range. ― Make sure that the gears shift smoothly from 1GR to 4GR. ― Make sure that TCC operates smoothly. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE [FN4A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FN4A-EL].)
9		No	DTC troubleshooting completed.