DTC P0757 (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL]

id0502a18085a7

DTC P0757

Shift solenoid B stuck ON

DETECTION CONDITION

• When either of DTC P0731 and P0733 are not generated, and both the following conditions are satisfied.
- When all conditions below are satisfied while driving in 2GR.
• ATF temperature 20 °C {68 °F} or above.
• Driving in D range.
• Engine runs.
• Turbine speed within 225-4,988 rpm.
• Differential gear case (output) revolution speed 35 rpm or above.
• Revolution ratio of forward clutch drum revolution to differential gear case revolution below 1.249 or more than 2.157.
• Any of the following are not generated: DTC P0705, P0706, P0710, P0715, P0720, P0751, P0752, P0753, P0756, P0757, P0758, P0761, P0762, P0763, P0766, P0767, P0768, P0771, P0772, P0773.
- When all conditions below are satisfied with driving in 4GR.
• ATF temperature 20 °C {68 °F} or above.
• Driving in D range.
• Engine runs.
• Turbine speed within 225-4,988 rpm.
• Differential gear case (output) revolution speed 35 rpm or above.
• Vehicle speed 50 km/h {31 mph}.
• Throttle opening angle closed throttle position.
• Revolution ratio of forward clutch drum revolution to differential gear case revolution below 0.6 or 1.249 or above.
• Any of the following are not generated: DTC P0706, P0707, P0708, P0712, P0713, P0715, P0720, P0751, P0752, P0753, P0756, P0757, P0758, P0761, P0762, P0763, P0766, P0767, P0767, P0768, P0771, P0772, P0773.
Diagnostic support note:
• This is a continuous monitor (CCM).
• MIL illuminates if TCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the TCM.
• PENDING CODE is available if TCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• AT warning light illuminates.
• DTC is stored in the TCM memory.

POSSIBLE CAUSE

• ATF level low.
• Deteriorated ATF.
• Shift solenoid B stuck.
• Control valve stuck.
• TCM malfunction.

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has FREEZE FRAME PID DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME PID DATA on repair order, then go to next step.
2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Check for related Service Bulletins availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available repair information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3

CHECK ATF CONDITION

• Turn ignition key to OFF.
• Check ATF condition.
- Clear red: Normal
- Milky: Water mixed in fluid
- Reddish brown: Deteriorated ATF
• Is it okay?
Yes
Go to next step.
No
If ATF color milky or reddish brown, replace ATF, then go to Step 5.
4

CHECK ATF LEVEL

• Start engine.
• Warm up ATX.
• Is ATF level within specification?
Yes
Go to next step.
No
Adjust ATF level, then go to Step 7.
5

INSPECT LINE PRESSURE

• Start engine.
• Measure line pressure.

Specification

D, M (1GR, 2GR) range

Idle: 330-470 kPa {3.4-4.8 kgf/cm2,

48-68 psi}

Stall: 1,160-1,320 kPa {11.8-13.5 kgf/cm2, 168-191 psi}

R position

Idle: 490-710 kPa {5.0-7.2 kgf/cm2,

71-102 psi}

Stall: 1,640-1,970 kPa {16.8-20.0 kgf/cm2, 238-285 psi}

• Is line pressure within specification?
Yes
Go to next step.
No
• All ranges: Replace oil pump or control valve body, then go to Step 7.
• Any ranges: Replace ATX, then go to Step 7.
6

CHECK OPERATION OF EACH VALVE AND EACH SPRING

• Turn ignition key to OFF.
• Remove control valve body.
• Disassemble control valve body.
• Is each valve operation okay and is return spring okay?
Yes
Replace ATX, then go to next step.
No
Repair or replace shift valve and return spring, then go to next step.
7

VERIFY TROUBLESHOOTING OF DTC P0757 COMPLETED

• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Start engine.
• Warm up ATX.
• Drive the vehicle under the following conditions make sure that gears shift smoothly from 1GR to 4GR.
- ATF temperature: 20 °C {68 °F} or above
- Drive in D range
- Engine speed: 450 rpm or above (RPM PID)
- Throttle opening angle (TP PID): 0% (4th gear only)
- Vehicle speed (VSS PID): 50 km/h {31 mph} (4th gear only)
• Is pending code present?
Yes
Replace TCM, then go to next step.
No
Go to next step.
8

VERIFY AFTER REPAIR PROCEDURE

• Perform "After Repair Procedure".
• Are any DTCs present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.