DTC P0756:00 [FN4A-EL]

DTC P0756:00	Shift solenoid B stuck off
DETECTION CONDITION	• Under the following conditions, the gear ratio in 1GR (D position) is incorrect. ― Gear ratio in 2GR is correct ― Gear ratio in 3GR is correct ― Gear ratio in 4GR is correct Diagnostic support note • The check engine light illuminates if the PCM 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 PCM. • The automatic transaxle warning light illuminates if the PCM 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 PCM. • PENDING CODE is available. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Deteriorated ATF • ATF level low • Shift solenoid B malfunction • Line pressure malfunction • Control valve body malfunction • PCM malfunction

DTC P0756:00

Shift solenoid B stuck off

DETECTION CONDITION

• Under the following conditions, the gear ratio in 1GR (D position) is incorrect.

― Gear ratio in 2GR is correct

― Gear ratio in 3GR is correct

― Gear ratio in 4GR is correct

Diagnostic support note

• The check engine light illuminates if the PCM 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 PCM.

• The automatic transaxle warning light illuminates if the PCM 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 PCM.

• PENDING CODE is available.

• FREEZE FRAME DATA is available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Deteriorated ATF

• ATF level low

• Shift solenoid B malfunction

• Line pressure malfunction

• Control valve body malfunction

• PCM malfunction

STEP	INSPECTION	ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded on the repair order?	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 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 • Inspect the ATF condition. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].) • Is it normal?	Yes	Go to the next step.
No	Replace the ATF, then go to Step 8. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL])
4	INSPECT ATF LEVEL • Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].) • Is it normal?	Yes	Go to the next step.
No	Add ATF to the specified level, then go to Step 8. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL])
5	INSPECT SHIFT SOLENOID B • Inspect the shift solenoid B. (See SOLENOID VALVE INSPECTION [FN4A-EL].) • Is there any malfunction?	Yes	Replace the shift solenoid B, then go to Step 8. (See SOLENOID VALVE REMOVAL/INSTALLATION [FN4A-EL].)
No	Go to the next step.
6	INSPECT LINE PRESSURE • Perform the “Line Pressures Test”. (See MECHANICAL SYSTEM TEST [FN4A-EL].) • Is there any malfunction?	Yes	Repair or replace malfunctioning part according to test result, then go to Step 8.
No	Go to the next step.
7	INSPECT CONTROL VALVE BODY • Remove the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [FN4A-EL].) • Disassemble the control valve body. • Inspect the following parts: ― Shift valve ― Return spring ― Hydraulic passage • Is there any malfunction?	Yes	Repair or replace malfunctioning part according to inspection result, then go to next step.
No	Replace the transaxle, then go to the next step. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FN4A-EL].)
8	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC using the M-MDS. • Perform the following procedure to ensure that the DTC has been resolved: 1. Drive the vehicle in 1GR under the following conditions for 1 s or more. ― Accelerator pedal position is 4.53% or more ― Time since selector lever changing to D position is 10 s or more ― Vehicle is driven without shifting ― ATF temperature (PID item: TFT) is 20 °C {68 °F} or more ― Engine speed (PID item: RPM) is 300 rpm or more ― Turbine speed (PID item: TSS) is 225 to 4,987 rpm ― Output shaft speed (PID item: OSS) is 35 rpm or more 2. Stop the vehicle. 3. Repeat Step 1—2 three times. • Is the PENDING CODE same as the DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [FN4A-EL].)
No	Go to the next step.
9	VERIFY NO DTCs ARE PRESENT • Perform the “Reading DTCs Procedure”. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FN4A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FN4A-EL].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has the FREEZE FRAME DATA been recorded on the repair order?

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 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

• Inspect the ATF condition.

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].)

• Is it normal?

Yes

Go to the next step.

Replace the ATF, then go to Step 8.

(See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL])

INSPECT ATF LEVEL

• Inspect the ATF level.

(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].)

• Is it normal?

Yes

Go to the next step.

Add ATF to the specified level, then go to Step 8.

(See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FN4A-EL])

INSPECT SHIFT SOLENOID B

• Inspect the shift solenoid B.

(See SOLENOID VALVE INSPECTION [FN4A-EL].)

• Is there any malfunction?

Yes

Replace the shift solenoid B, then go to Step 8.

(See SOLENOID VALVE REMOVAL/INSTALLATION [FN4A-EL].)

Go to the next step.

INSPECT LINE PRESSURE

• Perform the “Line Pressures Test”.

(See MECHANICAL SYSTEM TEST [FN4A-EL].)

• Is there any malfunction?

Yes

Repair or replace malfunctioning part according to test result, then go to Step 8.

Go to the next step.

INSPECT CONTROL VALVE BODY

• Remove the control valve body.

(See CONTROL VALVE BODY REMOVAL/INSTALLATION [FN4A-EL].)

• Disassemble the control valve body.

• Inspect the following parts:

― Shift valve

― Return spring

― Hydraulic passage

• Is there any malfunction?

Yes

Repair or replace malfunctioning part according to inspection result, then go to next step.

Replace the transaxle, then go to the next step.

(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FN4A-EL].)

VERIFY DTC TROUBLESHOOTING COMPLETED

• Make sure to reconnect all the disconnected connectors.

• Clear the DTC using the M-MDS.

• Perform the following procedure to ensure that the DTC has been resolved:

1. Drive the vehicle in 1GR under the following conditions for 1 s or more.

― Accelerator pedal position is 4.53% or more

― Time since selector lever changing to D position is 10 s or more

― Vehicle is driven without shifting

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

― Engine speed (PID item: RPM) is 300 rpm or more

― Turbine speed (PID item: TSS) is 225 to 4,987 rpm

― Output shaft speed (PID item: OSS) is 35 rpm or more

2. Stop the vehicle.

3. Repeat Step 1—2 three times.

• Is the PENDING CODE same as the DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [FN4A-EL].)

Go to the next step.

VERIFY NO DTCs ARE PRESENT

• Perform the “Reading DTCs Procedure”.

(See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FN4A-EL].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FN4A-EL].)

DTC troubleshooting completed.