DTC P0731, P0732, P0733, P0734, P0751, P0756, P1751, P1756[LA4AX-EL (CD4E)]

id050207806400

DTC P0731

Gear 1 incorrect

DTC P0732

Gear 2 incorrect

DTC P0733

Gear 3 incorrect

DTC P0734

Gear 4 incorrect

DTC P0751

Shift solenoid A circuit malfunction

DTC P1751

DTC P0756

Shift solenoid B circuit malfunction

DTC P1756
DETECTION CONDITION
•  P0731: Does not shift to 1st gear while driving
•  P0732: Does not shift to 2nd gear while driving
•  P0733: Does not shift to 3rd gear while driving
•  P0734: Does not shift to 4th gear while driving
•  P0751, P1751: Malfunction in shift solenoid A mechanical or oil pressure systems.
•  P0756, P1756: Malfunction in shift solenoid B mechanical or oil pressure systems.
POSSIBLE CAUSE
•  Shift solenoid valve A malfunction
•  Shift solenoid valve B malfunction
•  Transaxle internal malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
VERIFY DTCS
•  Turn the ignition switch to the LOCK position, then to the ON position.
•  Verify the DTCs in the PCM memory.
•  Are except DTCs P0731, P0732, P0733, P0734, P0751, P0756, P1751 and P1756 output?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE[LA4AX-EL (CD4E)].)
No
Go to the next step.
3
SHIFT SOLENOID OPERATION INSPECTION
•  Drive in D range.
•  Connect the M-MDS to the DLC-2 and select the following PIDS.
―  SSA/SS1
―  SSB/SS2
•  Using the M-MDS, verify the operation status of shift solenoid A and shift solenoid B while driving.
―  1GR: SSA/SS1 on, SSB/SS2 on
―  2GR: SSA/SS1 off, SSB/SS2 on
―  3GR: SSA/SS1 off, SSB/SS2 off
―  4GR: SSA/SS1 on, SSB/SS2 off
•  Is the shift solenoid operation normal?
Yes
Go to the next step.
No
Replace the solenoid body assembly, then go to Step 8.
(See MAIN CONTROL VALVE BODY REMOVAL/INSTALLATION[LA4AX-EL (CD4E)].)
4
INSPECT ROAD TEST
•  Road-test the vehicle to verify the respective shift points.
•  Are the shift points normal?
Yes
Go to the next step.
No
Inspect the symptom troubleshooting, then go to the next step.
(See SYMPTOM TROUBLESHOOTING ITEM TABLE[LA4AX-EL (CD4E)].)
5
VERIFY TROUBLESHOOTING OF DTC P0731, P0732, P0733, P0734, P0751, P0756, P1751 OR P1756 COMPLETED
•  Make sure to reconnect all the disconnected connectors.
•  Clear the DTC using the M-MDS.
•  Start the engine.
•  Perform the “After Repair Procedure”.
•  Are any DTCs present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)
No
Go to the next step.
6
VERIFY DTCS
•  Are except DTCs P0731, P0732, P0733, P0734, P0751, P0756, P1751 and P1756 output?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE[LA4AX-EL (CD4E)].)
No
DTC troubleshooting completed.