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.
• | No TP DTCs P0121, P0122 or P0123. |
• | No VSS DTCs P0502 or P0503. |
• | No AT ISS DTCs P0716 or P0717. |
• | No shift solenoid electrical DTCs P0753 or P0758. |
• | No engine torque DTC P1644. |
• | No TFP manual valve position switch DTC P1810. |
• | The system voltage is 8-18 volts. |
• | 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 (68-233°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 engine torque is greater than 27 N·m (20 lb ft). |
• | The TCC slip speed is greater than 200 RPM when 1st gear is commanded. |
• | The PCM commands 1st gear and the gear ratio is 0.61:1-0.72:1, 4th gear, for 4 seconds. |
• | The PCM commands 2nd gear and the gear ratio is 0.91:1-1.07:1, 3rd gear, for 4 seconds. |
• | 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 adapt 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. |
• | 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. |
• | If you clear DTC P0756, and then cannot reset DTC P0756, inspect for the following conditions: |
- | Fluid contamination |
- | Plugged fluid circuits |
- | Restricted fluid circuits |
• | Refer to Shift Solenoid Valve State and Gear Ratio . |
The numbers below refer to the step numbers on the diagnostic table.
This step verifies a 4-3-3-4 shift pattern.
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 Powertrain Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 2.2L (L61) or Diagnostic System Check - Engine Controls in Engine Controls - 2.2L (LN2) | ||||||
2 | Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Check | ||||||
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. 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 | |||||||
Refer to Control Valve Body Disassemble in Transmission Unit Repair Manual. Did you complete the repair? | -- | Go to Step 5 | -- | |||||||
5 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK | Go to Step 1 |
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 4 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 four conditions:
• | A stuck ON 2-3 SS valve |
• | A stuck OFF 2-3 SS valve |
• | A stuck ON 2-3 shift valve |
• | A stuck OFF 2-3 shift valve |
When the PCM detects an actual gear ratio that does not agree with the commanded gear, then DTC P0756 sets. DTC P0756 is a type A DTC.
• | No TP DTCs P0121, P0122 or P0123. |
• | No VSS DTCs P0502 or P0503. |
• | No AT ISS DTCs P0716 or P0717. |
• | No shift solenoid electrical DTCs P0753 or P0758. |
• | No engine torque DTC P1644. |
• | No TFP manual valve position switch DTC P1810. |
• | The engine is running. |
• | The TFP manual valve position switch is not indicating Park, Reverse, or Neutral. |
• | The transmission fluid temperature is greater than 21°C (70°F). |
• | The TP is greater than 8 percent. |
• | The vehicle speed is greater than 8 km/h (5 mph). |
One of the following cases occurs:
The following conditions occur twice during the same trip:
• | The PCM commands 1st gear and the gear ratio is 0.61:1-0.72:1, 4th gear, for 2 seconds. |
• | The PCM commands 2nd gear and the gear ratio is 0.91:1-1.07:1, 3rd gear, for 2 seconds. |
• | The PCM commands 3rd gear and the gear ratio is 1.54:1-1.71:1, 2nd gear, for 3 seconds. |
• | The PCM commands 4th gear and the gear ratio is 2.87:1-3.13:1, 1st gear, for 4 seconds. |
• | 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 adapt 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. |
• | 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. |
• | If you clear DTC P0756, and then cannot reset DTC P0756, inspect for the following conditions: |
- | Fluid contamination |
- | Plugged fluid circuits |
- | Restricted fluid circuits |
• | Refer to Shift Solenoid Valve State and Gear Ratio . |
The numbers below refer to the step numbers on the diagnostic table.
This step verifies that the gear ratio is correct for the commanded gear.
This step tests for a mechanical or hydraulic condition causing the 2-3 SS valve to be stuck OFF, or the circuit to be released.
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 Powertrain Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 2.4L | ||||||||
2 | Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Check | ||||||||
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. Are the gear ratios within the given gear range? | 1st: 2.87:1-3.13:1 4th: 0.61:1-0.72:1 | Go to Diagnostic Aids | Go to Step 4 | |||||||||
4 | Does the engine labor at start-off, or is 3rd gear indicated when 1st gear is commanded? | -- | Go to Step 6 | Go to Step 5 | ||||||||
Refer to Control Valve Body Disassemble in Transmission Unit Repair Manual. Did you complete the repair? | -- | Go to Step 7 | -- | |||||||||
Refer to Control Valve Body Disassemble in Transmission Unit Repair Manual. Did you complete the repair? | -- | Go to Step 7 | -- | |||||||||
7 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK | Go to Step 1 |