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

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.
No
Go to the next step.
2
INSPECT ATF CONDITION
•  Inspect the ATF condition.
•  Is it normal?
Yes
Go to the next step.
No
Replace the ATF, then go to Step 8.
3
INSPECT ATF LEVEL
•  Inspect the ATF level.
•  Is it normal?
Yes
Go to the next step.
No
Add ATF to the specified level, then go to Step 8.
4
INSPECT SHIFT SOLENOID A AND D
•  Perform operation inspection.
•  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.
No
Replace the shift solenoid that you could not hear a click sound, then go to Step 8.
5
INSPECT LINE PRESSURE
•  Measure the line pressures.
•  Are the line pressures within the specifications?
Yes
Go to the next step.
No
All ranges: Replace the oil pump, then go to Step 8.
Any ranges: Replace the control valve body, then go to Step 8.
6
INSPECT STALL SPEED
•  Measure the stall speed in D range.
•  Is the stall speed within the specification?
Yes
Go to the next step.
No
Replace the transaxle, then go to Step 8.
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.
No
Replace the control valve body, then go to the next step.
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.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “After Repair Procedure”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.