For 1990-2009 cars

## DTC P0756 2.2L (L61)

Master Electrical Component List
Automatic Transmission Controls Schematics 2.2L
OBD II Symbol Description Notice

### Circuit Description

The 2-3 shift solenoid (SS) valve is a normally-open exhaust valve that, in conjunction with the 1-2 shift solenoid (SS) valve, allows four different shifting combinations. Refer to Shift Solenoid Valve State and Gear Ratio . The 2-3 SS valve is attached to the control valve body within the transmission.

The PCM monitors the actual gear ratio, and compares the actual gear ratio with the commanded gear ratio. DTC P0756 sets under two conditions:

• | A stuck ON 2-3 SS valve

• | A stuck ON 2-3 shift valve

When the PCM detects a 4-3-3-4 shift pattern, then DTC P0756 sets. DTC P0756 is a type A DTC.

### Conditions for Running the DTC

• | No MAP DTCs P0107 or P0108.

• | No TP DTCs P0121, P0122 or P0123.

• | No VSS DTCs P0502 or P0503.

• | No AT ISS DTCs P0716 or P0717.

• | No TCC stuck ON DTC P0742.

• | No shift solenoid electrical DTCs P0753 or P0758.

• | No TCC electrical DTC P1860.

• | The engine run time is greater than 5 seconds.

• | The TFP manual valve position switch is not indicating Park, Reverse, or Neutral.

• | The transmission fluid temperature is 20-130°C (68-266°F).

• | The TP is greater than 8 percent.

• | The input speed is 150-6,000 RPM.

• | The output speed is greater than 150 RPM.

• | The output speed is greater than 160 RPM when 1st gear is commanded.

• | The engine torque is greater than 27 N·m (20 lb ft).

• | The TCC slip speed is between 200-1850 RPM when 1st gear is commanded.

### Conditions for Setting the DTC

• | The PCM commands 1st gear and the gear ratio is 0.61:1-0.72:1, 4th gear, for 2.5 seconds.

• | The PCM commands 2nd gear and the gear ratio is 0.91:1-1.07:1, 3rd gear, for 1 second.

### Action Taken When the DTC Sets

• | The PCM illuminates the malfunction indicator lamp (MIL).

• | The PCM commands an immediate landing to 2nd gear.

• | The PCM commands maximum line pressure.

• | The PCM inhibits TCC engagement.

• | The PCM freezes transmission adaptive functions.

• | The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.

• | The PCM stores DTC P0756 in PCM history.

### Conditions for Clearing the MIL/DTC

• | The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.

• | A scan tool can clear the MIL/DTC.

• | The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.

• | The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.

### Diagnostic Aids

• | If you clear DTC P0756, and then cannot set DTC P0756 again, inspect for the following conditions:

- | Fluid contamination

- | Plugged fluid circuits

- | Restricted fluid circuits

• | Refer to Shift Solenoid Valve State and Gear Ratio .

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step verifies a 4-3-3-4 shift pattern.

2. This step tests for a mechanical or hydraulic condition causing the 2-3 SS valve to be stuck ON, or the circuit to be applied.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 2.2L (L61)
2 | Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Checking Procedure
3 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.

Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.

3. Record the DTC Freeze Frame and Failure Records.
4. Clear the DTC.
5. Use the scan tool snapshot mode in order to record current gear and gear ratio.
6. Drive the vehicle in D4, in order to obtain 1-2, 2-3 and 3-4 shifts with a TP greater than 8%.

Are current gear and gear ratio within the specified values?

1st/4th:

0.61:1-0.72:1

2nd/3rd:

0.91:1-1.07:1

Go to Step 4

Go to Diagnostic Aids

4 |

1. Inspect the 2-3 shift circuit for the following conditions:

• | 2-3 SS valve mechanically stuck ON

• | 2-3 shift valve stuck in the applied position

• | Refer to Shift Solenoid Leak Test .

2. Repair the circuit as necessary.

Refer to 2-3 Shift Solenoid Valve Replacement .

Did you complete the repair?

--

Go to Step 5

--

5 | Perform the following procedure in order to verify the repair:

1. Select DTC.
2. Select Clear Info.
3. Operate the vehicle under the following conditions:

• | Drive the vehicle in D4.

• | Allow the transmission to shift through all the gears.

• | Monitor the current gear and gear ratios. The actual gear ratios must match the commanded gears for 0.75 second, for all gears.

4. Select Specific DTC.
5. Enter DTC P0756.

Has the test run and passed?

--

Go to Step 6

Go to Step 2

6 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.2L (L61) | System OK

## DTC P0756 3.0L (L81)

Master Electrical Component List
Automatic Transmission Controls Schematics 3.0L
OBD II Symbol Description Notice

### Circuit Description

The 2-3 shift solenoid (SS) valve is a normally-open exhaust valve that, in conjunction with the 1-2 shift solenoid (SS) valve, allows four different shifting combinations. Refer to Shift Solenoid Valve State and Gear Ratio . The 2-3 SS valve is attached to the control valve body within the transmission.

The TCM monitors the actual gear ratio, and compares the actual gear ratio with the commanded gear ratio. DTC P0756 sets under two conditions:

• | A stuck ON 2-3 SS valve

• | A stuck ON 2-3 shift valve

When the TCM detects a 4-3-3-4 shift pattern, then DTC P0756 sets. DTC P0756 is a type A DTC.

### Conditions for Running the DTC

• | No MAP DTCs P0107 or P0108.

• | No MAF DTCs P0101, P0102, or P0103.

• | No TP DTCs P0121, P0122 or P0123.

• | No VSS DTCs P0502 or P0503.

• | No AT ISS DTCs P0716 or P0717.

• | No TCC stuck ON DTC P0742.

• | No shift solenoid electrical DTCs P1842, P1843, P1845, or P1847.

• | The engine run time is greater than 5 seconds.

• | The transmission fluid temperature is 20-130°C (68-266°F).

• | The TP is greater than 8 percent.

• | The engine torque is greater than 30 N·m (22 lb ft).

• | The vehicle speed is greater tan 8 km/h (5 mph).

### Conditions for Setting the DTC

• | The TCM commands 1st gear and the gear ratio is 0.61:1-0.71:1, 4th gear, for 2 seconds.

• | The TCM commands 2nd gear and the gear ratio is 0.91:1-1.07:1, 3rd gear, for 3 seconds.

### Action Taken When the DTC Sets

• | The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL).

• | The TCM commands an immediate landing to 2nd gear.

• | The TCM commands maximum line pressure.

• | The TCM inhibits TCC engagement.

• | The TCM turns off power to all solenoids.

• | The TCM freezes transmission adaptive functions.

• | The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.

• | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.

• | The TCM stores DTC P0756 in TCM history.

### Conditions for Clearing the MIL/DTC

• | The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.

• | A scan tool can clear the MIL/DTC.

• | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.

• | The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.

### Diagnostic Aids

• | If you clear DTC P0756, and then cannot set DTC P0756 again, inspect for the following conditions:

- | Fluid contamination

- | Plugged fluid circuits

- | Restricted fluid circuits

• | Refer to Shift Solenoid Valve State and Gear Ratio .

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step verifies a 4-3-3-4 shift pattern.

2. This step tests for a mechanical or hydraulic condition causing the 2-3 SS valve to be stuck ON, or the circuit to be applied.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.0L (L81)
2 | Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Checking Procedure
3 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.

Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from both the ECM and the TCM.

3. Record the DTC Freeze Frame and Failure Records.
4. Clear the DTC.
5. Use the scan tool snapshot mode in order to record current gear and gear ratio.
6. Drive the vehicle in D4, in order to obtain 1-2, 2-3 and 3-4 shifts with a TP greater than 8%.

Are current gear and gear ratio within the specified values?

1st/4th:

0.61:1-0.71:1

2nd/3rd:

0.91:1-1.07:1

Go to Step 4

Go to Diagnostic Aids

4 |

1. Inspect the 2-3 shift circuit for the following conditions:

• | 2-3 SS valve mechanically stuck ON

• | 2-3 shift valve stuck in the applied position

• | Refer to Shift Solenoid Leak Test .

2. Repair the circuit as necessary.

Refer to 2-3 Shift Solenoid Valve Replacement .

Did you complete the repair?

--

Go to Step 5

--

5 | Perform the following procedure in order to verify the repair:

1. Select DTC.
2. Select Clear Info.
3. Operate the vehicle under the following conditions:

• | Drive the vehicle in D4.

• | Allow the transmission to shift through all the gears.

• | Monitor the current gear and gear ratios. The actual gear ratios must match the commanded gears for 0.8 second, for all gears.

4. Select Specific DTC.
5. Enter DTC P0756.

Has the test run and passed?

--

Go to Step 6

Go to Step 2

6 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 3.0L (L81) | System OK