P0751

Circuit Description
The Powertrain Control Module (PCM) monitors the following conditions:
^ The throttle opening
^ The engine speed
^ The vehicle speed
^ The gear position

The PCM compares the actual engine speed to the PCM specified value. The PCM specified value is the engine speed the PCM obtains through calculation by using the above conditions.

Conditions for Setting the DTC
^ When running the engine in DRIVE range, gear change control from the PCM to the transmission does not agree with the actual gear position. The above condition occurs even though solenoid valve #1 is electrically in good condition. Engine speed and the Vehicle Speed Sensor signal determine gear position.
^ Two driving cycle detection logic

Action Taken When the DTC Sets
^ DTC P0751 stores.
^ The Malfunction Indicator Lamp (MIL) turns ON.

Diagnostic Aid
Inspect for the following conditions:
^ The shift solenoid valve #1 is stuck.
^ The 2-3 shift valve is stuck.
^ The valve body fluid passage is clogged.
^ A direct clutch malfunction exists.
^ A faulty PCM exists.

If DTC P0751 cannot duplicate, the information included in the Freeze Frame data may be useful in determining the vehicle operating conditions when the DTC
set.

DTC Confirmation Procedure
1. Turn the ignition switch to the LOCK position.
2. Connect the scan tool to the data link connector (DLC).
3. Turn the ignition switch ON.
4. Use the scan tool in order to clear the following items:
^ DTCPO751
^ Any pending DTCs
5. Start the engine.
6. Warm the engine up to normal operating conditions.
7. Accelerate the vehicle in DRIVE range. Inspect for upshifting in the following gears as the vehicle speed increases:
7.1. 1st gear
7.2. 2nd gear
7.3. 3rd gear
7.4. 4th gear
8. Stop the vehicle.
9. Use the scan tool in order to test for a pending DTC.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. The scan tool creates an electronic copy of the data taken when the fault occurred. The information then stores in the scan tool for later reference.
3. This step tests for proper shift points.
5. This step inspects for a leaky solenoid # 1.Refer to the above figure.
6. This step inspects for a stuck closed TCC solenoid #1.
9. This step inspects the condition of the valve body assembly.
10. This step inspects for a faulty PCM.