DTC P0756[FS5A-EL]

DTC P0756	Shift solenoid B stuck off
DETECTION CONDITION	• When DTC P0732, P0733, and P0734 are not output, and all conditions below are satisfied. ― Engine running ― ATF temperature 20 °C {68 °F} or more ― Driving in 1GR at D range ― Turbine speed within 225—4,987 rpm ― Secondary gear revolution speed 50 rpm or more ― Differential gear case (output) revolution speed 35 rpm or more ― Throttle opening angle (THOP PID) 3.17% or more (LF) ― Throttle opening angle (THOP PID) 2.67% or more (L3) ― Revolution ratio of forward clutch drum revolution to secondary gear revolution 2.157 or less ― None of the following DTCs are present: P0706, P0707, P0708, P0712, P0713, P0715, P0720, P0751, P0752, P0753, P0757, P0758, P0761, P0762, P0763, P0766, P0767, P0768, P0771, P0772, P0773, P0791 Diagnostic support note: • This is a continuous monitor (CCM). • The MIL illuminates if the 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. • The PENDING CODE is available if the TCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • The AT warning light illuminates. • The DTC is stored in the TCM memory.
POSSIBLE CAUSE	• ATF level low • Deteriorated ATF • Shift solenoid B stuck off • Control valve stuck • TCM malfunction

DTC P0756

Shift solenoid B stuck off

DETECTION CONDITION

• When DTC P0732, P0733, and P0734 are not output, and all conditions below are satisfied.

― Engine running

― ATF temperature 20 °C {68 °F} or more

― Driving in 1GR at D range

― Turbine speed within 225—4,987 rpm

― Secondary gear revolution speed 50 rpm or more

― Differential gear case (output) revolution speed 35 rpm or more

― Throttle opening angle (THOP PID) 3.17% or more (LF)

― Throttle opening angle (THOP PID) 2.67% or more (L3)

― Revolution ratio of forward clutch drum revolution to secondary gear revolution 2.157 or less

― None of the following DTCs are present: P0706, P0707, P0708, P0712, P0713, P0715, P0720, P0751, P0752, P0753, P0757, P0758, P0761, P0762, P0763, P0766, P0767, P0768, P0771, P0772, P0773, P0791

Diagnostic support note:

• This is a continuous monitor (CCM).

• The MIL illuminates if the 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.

• The PENDING CODE is available if the TCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA is available.

• The AT warning light illuminates.

• The DTC is stored in the TCM memory.

POSSIBLE CAUSE

• ATF level low

• Deteriorated ATF

• Shift solenoid B stuck off

• Control valve stuck

• TCM malfunction

STEP	INSPECTION	ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • 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. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	INSPECT ATF CONDITION • Turn the ignition switch to the LOCK position. • Inspect the ATF condition. ― Clear red: Normal ― Milky: Water mixed in fluid ― Reddish brown: Deteriorated ATF • Is it normal? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[FS5A-EL].)	Yes	Go to the next step.
No	If the ATF color is milky or reddish brown, replace ATF, then go to Step 5. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT[FS5A-EL].)
4	INSPECT ATF LEVEL • Start the engine. • Warm up the ATX. • Is the ATF level within the specification? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[FS5A-EL].)	Yes	Go to the next step.
No	Add ATF to the specified level, then go to Step 7. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[FS5A-EL].)
5	INSPECT LINE PRESSURE • Start the engine. • Measure the line pressures. (See MECHANICAL SYSTEM TEST[FS5A-EL].) • Are the line pressures within the specifications?	Yes	Go to the next step.
No	• All ranges: Replace the oil pump or control valve body, then go to Step 7. • Any ranges: Replace the automatic transaxle, then go to Step 7. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION[FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)
6	INSPECT OPERATION OF EACH VALVE AND EACH SPRING • Turn the ignition switch to the LOCK position. • Remove the primary control valve body. • Disassemble the primary control valve body. • Is each valve operation normal and is the return spring normal? (See PRIMARY CONTROL VALVE BODY REMOVAL[FS5A-EL].) (See PRIMARY CONTROL VALVE BODY INSTALLATION[FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)	Yes	Replace the automatic transaxle, then go to the next step. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION[FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)
No	Repair or replace the shift valve and return spring, then go to the next step. (See PRIMARY CONTROL VALVE BODY REMOVAL[FS5A-EL].) (See PRIMARY CONTROL VALVE BODY INSTALLATION[FS5A-EL].) (See ATX Workshop Manual FS5A-EL.)
7	VERIFY TROUBLESHOOTING OF DTC P0756 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the memory using the M-MDS. • Start the engine. • Warm up the ATX. • Drive the vehicle under the following conditions and make sure that gears shift smoothly from 1GR to 4GR: ― ATF temperature (TFT PID): 20 °C {68 °F} or more ― Drive in the D range ― Engine speed (RPM PID): 450 rpm or more ― Throttle opening angle (THOP PID): 3.17% or more (LF) ― Throttle opening angle (THOP PID): 2.67% or more (L3) • Is the PENDING CODE present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION[FS5A-EL].)
No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE[FS5A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection.
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has the FREEZE FRAME DATA been recorded?

Yes

Go to the next step.

Record the FREEZE FRAME DATA on the repair order, then go to the next step.

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• 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.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT ATF CONDITION

• Turn the ignition switch to the LOCK position.

• Inspect the ATF condition.

― Clear red: Normal

― Milky: Water mixed in fluid

― Reddish brown: Deteriorated ATF

• Is it normal?

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[FS5A-EL].)

Yes

Go to the next step.

If the ATF color is milky or reddish brown, replace ATF, then go to Step 5.

(See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT[FS5A-EL].)

INSPECT ATF LEVEL

• Start the engine.

• Warm up the ATX.

• Is the ATF level within the specification?

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[FS5A-EL].)

Yes

Go to the next step.

Add ATF to the specified level, then go to Step 7.

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION[FS5A-EL].)

INSPECT LINE PRESSURE

• Start the engine.

• Measure the line pressures.

(See MECHANICAL SYSTEM TEST[FS5A-EL].)

• Are the line pressures within the specifications?

Yes

Go to the next step.

• All ranges: Replace the oil pump or control valve body, then go to Step 7.

• Any ranges: Replace the automatic transaxle, then go to Step 7.

(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION[FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

INSPECT OPERATION OF EACH VALVE AND EACH SPRING

• Turn the ignition switch to the LOCK position.

• Remove the primary control valve body.

• Disassemble the primary control valve body.

• Is each valve operation normal and is the return spring normal?

(See PRIMARY CONTROL VALVE BODY REMOVAL[FS5A-EL].)

(See PRIMARY CONTROL VALVE BODY INSTALLATION[FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

Yes

Replace the automatic transaxle, then go to the next step.

(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION[FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

Repair or replace the shift valve and return spring, then go to the next step.

(See PRIMARY CONTROL VALVE BODY REMOVAL[FS5A-EL].)

(See PRIMARY CONTROL VALVE BODY INSTALLATION[FS5A-EL].)

(See ATX Workshop Manual FS5A-EL.)

VERIFY TROUBLESHOOTING OF DTC P0756 COMPLETED

• Make sure to reconnect all the disconnected connectors.

• Clear the DTC from the memory using the M-MDS.

• Start the engine.

• Warm up the ATX.

• Drive the vehicle under the following conditions and make sure that gears shift smoothly from 1GR to 4GR:

― ATF temperature (TFT PID): 20 °C {68 °F} or more

― Drive in the D range

― Engine speed (RPM PID): 450 rpm or more

― Throttle opening angle (THOP PID): 3.17% or more (LF)

― Throttle opening angle (THOP PID): 2.67% or more (L3)

• Is the PENDING CODE present?

Yes

Replace the TCM, then go to the next step.

(See TCM REMOVAL/INSTALLATION[FS5A-EL].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See AFTER REPAIR PROCEDURE[FS5A-EL].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

DTC troubleshooting completed.