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Mazda 3 code p0734 - MAZDA3 Mazda Cars & Trucks

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DTC P0734 Gear 4 incorrect (incorrect gear ratio detected) DETECTION CONDITION
• The PCM monitors revolution ratio of the forward clutch drum revolution to the differential gear case revolution when the following monitoring conditions are met. If the revolution ratio is below 0.6 or 1.25 or more, the PCM determines that there is a malfunction. Monitoring condition: - ATF temperature 20 °C {68 °F} or more - Driving in 4 GR in D or M range - Engine running - Turbine speed within 225-4,987 rpm - Vehicle speed 50 km/h {31 mph} or more - Closed throttle position - Differential gear case (output) revolution speed 35 rpm or more - None of the following present: 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). • The MIL does not illuminate. • The AT warning light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is not available. • A PENDING CODE is not available. • The DTC is stored in the PCM memory. POSSIBLE CAUSE
• ATF level low • Deteriorated ATF • Shift solenoids A, B or C stuck • Pressure control solenoid stuck • Line pressure low 2-4 brake band slipping 3-4 clutch slipping • Forward clutch slipping • Control valve stuck (Bypass or 3-4 shift valve) • Oil pump malfunction • PCM malfunction
Diagnostic procedure
• Verify related Service Bulletins and/or on-line repair 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. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION.) • Is it normal? Yes Go to the next step. No Replace the transaxle, then go to Step 8. 3 INSPECT ATF LEVEL
• Start the engine. • Warm up the ATX. • Is the ATF level within the specification? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION.) Yes Go to the next step. No Add ATF to the specified level, then go to Step 8. 4 INSPECT SHIFT SOLENOID VALVE A AND D FOR CLICK SOUND
• Perform operation inspection. (See SOLENOID VALVE INSPECTION.) • Verify the click sound of shift solenoids A and D when applying B+ to each transaxle terminal. 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 solenoid where you could not hear click sound, then go to Step 8. (See SOLENOID VALVE REMOVAL/INSTALLATION.) 5 INSPECT LINE PRESSURE
• Start the engine. • Measure the line pressures. Specification
Idle: 330-470 kPa {3.4-4.7 kgf/cm2, 48-68 psi}
1,090-1,250 kPa {11.2-12.7 kgf/cm2, 159-181 psi} (Z6)
1,160-1,320 kPa {11.8-13.5 kgf/cm2, 168-191 psi} (LF)
• Are the line pressures within the specifications? (See Line Pressure Test.) 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. (See CONTROL VALVE BODY REMOVAL.) (See CONTROL VALVE BODY INSTALLATION.) 6 INSPECT STALL SPEED
• Measure the stall speed in D range. (See Stall Test.) Specification
2,100-2,700 rpm (Z6)
2,000-2,600 rpm (LF)
• Is the stall speed within the specification? Yes Go to the next step. No Replace the automatic transaxle, then go to Step 8. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [Z6].) (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [LF].) 7 INSPECT FREQUENCY OF INPUT/TURBINE SPEED SENSOR WHEN DRIVING VEHICLE
• Turn the ignition switch to the LOCK position. • Connect the WDS or equivalent. • Start the engine. • Measure the frequency of input/turbine speed sensor while driving vehicle under the following conditions: - Vehicle speed (VSS PID): 80 km/h {49 mph} - Drive in the D range, 4GR - Throttle opening angle (TP PID): approx. 25% • Was the frequency of the input/turbine speed sensor at approx. 1,200 Hz? Yes Go to the next step. No Replace the control valve body, then go to the next step. (See CONTROL VALVE BODY REMOVAL.) (See CONTROL VALVE BODY INSTALLATION.) 8 VERIFY REPAIR OF DTC P0732
• Make sure to reconnect all the disconnected connectors. • Clear the DTC using the WDS or equivalent. • Start the engine. • Warm up the transaxle. • Drive the vehicle under the following conditions for more than 5 s: - ATF temperature: 20 °C {68 °F} or more - Drive in the D range, 4GR - Throttle opening angle (TP PID): 0% - Vehicle speed (VSS PID): 50 km/h {31 mph} or more • Are any DTCs present? Yes Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [ZJ, Z6].) (See PCM REMOVAL/INSTALLATION [LF].) 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. No DTC troubleshooting completed. click here to refer to this reference.
if you need further assistance please let me know and i will be glad to assist you further. Thanks, Midwest-tek

Posted on Aug 31, 2010

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P0734 Gear 4 Incorrect ratio

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Posted on Aug 31, 2010

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This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as follows:

Torque converter slip ratio = A x C/B A: Output shaft revolution signal from revolution sensor B: Engine speed signal from ECM C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (2nd and 4th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

This malfunction will be caused when shift solenoid valve B is stuck open.

Gear positions supposed by TCM are as follows. In case of gear position with no malfunctions: 1 , 2, 3 and 4 positions In case of gear position with shift solenoid valve B stuck open: 4* , 3, 3 and 4 positions to each gear position above.

Symptoms: Engine Light ON (or Service Engine Soon Warning Light)

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