P0751

Diagnostic Chart 1 Of 2:

Diagnostic Chart 2 Of 2:

Schematic:

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 that the PCM obtains through calculation by using the above conditions.

CONDITIONS FOR SETTING THE DTC
^ While running the engine in DRIVE range after the engine is warmed up, the PCM compares the engine speed with the vehicle speed. If the value is not within the acceptable range, the PCM will set the DTC. The above condition occurs even though solenoid valve #1 is electrically in good condition.
^ Two driving cycle detection logic.

ACTION TAKEN WHEN THE DTC SETS
^ DTC P0751 is stored.
^ The Malfunction Indicator Lamp (MIL) turns ON.

DIAGNOSTIC AIDS
Inspect for the following conditions:
^ The Throttle Valve (TV) cable out of adjustment.
^ The shift select cable out of adjustment.
^ A clogged or leaky shift solenoid valve #1.
^ A transaxle mechanical malfunction exists.
^ A clogged valve body fluid passage.
^ A torque converter clutch malfunction.
^ A faulty PCM exists.

If DTC P0751 cannot duplicate, the information in the Freeze Frame data may help you to determine 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:
^ DTC P0751
^ Any pending DTCs
^ The freeze frame data in the PCM memory.
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 gear
7.3. 3rd gear 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 to store the freeze frame data on the scan tool, if applicable. The scan tool creates an electronic copy of the data that was taken when the fault occurred. This information is stored 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.
Refer to the figure.
9. This step inspects the condition of the valve body assembly.
10. This step inspects for a faulty PCM.