Dtc P0734 - Mazda 2002 6 Workshop Manual

DTC P0734

DTC P0734 Gear 4 incorrect (Incorrect Gear Ratio Detected)
• PCM monitors revolution ratio of forward clutch drum revolution to differential gear case revolution when the
following monitoring conditions are met. If revolution ratio is below 0.6 or above 1.249, PCM determines
that there is malfunction.
Monitoring condition:
— ATF temperature 20 °C {68 °F} or above.
— Driving in 4 GR in D range.
— Engine run.
— Turbine speed within 225—4,988 rpm.
— Vehicle speed 50 km/h {31 mph} or above.
— Closed throttle position.
DETECTION
— Differential gear case (output) revolution speed 35 rpm or above.
CONDITION
— Any of the following not generated: DTC P0500, P0706, P0707, P0708, P0712, P0713, P0715, P0751,
P0752, P0753, P0756, P0757, P0758, P0761, P0762, P0763, P0766, P0767, P0768, P0771, P0772,
P0773.
Diagnostic support note:
• This is a continuous monitor (CCM).
• MIL does not illuminate.
• HOLD indicator light flashes if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is not available.
• Pending code is not available.
• DTC stored in the PCM memory.
• ATF level low
• Deteriorated ATF
• Shift solenoids A, B or C stuck
• Pressure control solenoid stuck
• Line pressure low
POSSIBLE
• 2-4 brake band slipping
CAUSE
• 3-4 clutch slipping
• Forward clutch slipping
• Control valve stuck (Bypass or 3-4 shift valve)
• Oil pump
• PCM malfunction
Diagnostic procedure
STEP
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins availability.
• Is any related repair information available?
2 CHECK ATF CONDITION
• Check ATF condition.
(See K–12 AUTOMATIC TRANSAXLE FLUID
(ATF) INSPECTION.)
• Is it okay?
3 CHECK ATF LEVEL
• Start engine.
• Warm up ATX.
• Is ATF level within specification?
(See K–12 AUTOMATIC TRANSAXLE FLUID
(ATF) INSPECTION.)
4 INSPECT SHIFT SOLENOID VALVE A AND D
FOR CLICK SOUND
• Perform inspection of operation. (See
SOLENOID VALVE
• Verify the click sound of shift solenoids A and D
when applying B+ to each transaxle connector
terminal.
Note
• Click from solenoid D is barely audible.
Remove solenoids to correctly inspect if
necessary.
• Was click heard from solenoids?
ON-BOARD DIAGNOSTIC
INSPECTION
K–26
INSPECTION.)
Yes Perform repair or diagnosis according to available repair
information.
No Go to next step.
Yes Go to next step.
No Replace ATF, then go to Step 8.
Yes Go to next step.
No Adjust ATF level, then go to Step 8.
Yes Go to next step.
No Replace solenoid that you could not hear click sound, then
go to Step 8.
(See K–28 SOLENOID VALVE REMOVAL/
INSTALLATION.)
A6E567001030W16
ACTION
K–75
K