P0773
DTC P0773
Circuit Description
The torque converter clutch (TCC) solenoid is used to engage the lock-up clutch. The powertrain control module (PCM) outputs system voltage to turn ON/energize or remove voltage to turn OFF/de-energize to control the hydraulic pressure to the lock-up valve within the transaxle. The TCC solenoid is always OFF in 1st and 2nd gears. The TCC is ON in 3rd and 4th gears when the PCM deems it appropriate.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0773 Torque Converter Clutch (TCC) Enable Solenoid Control Circuit
Conditions for Setting the DTC
^ The code will set if the PCM detects a short or an open in the TCC solenoid circuit.
^ One driving cycle detection logic
Action Taken When the DTC Sets
A DTC P0773 is stored and the Malfunction Indicator Lamp (MIL) is turned ON.
Diagnostic Aids
Inspect for the following conditions:
^ An open or shorted TCC Solenoid
^ Faulty electrical circuits-Open or short to ground between the TCC Solenoid and the PCM
^ A faulty PCM
An intermittent may be caused by the following conditions:
^ A poor connection
^ Rubbed through wire insulation
^ A broken wire inside the insulation
Inspect the PCM harness connectors for the following conditions:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Inadequate terminal-to-wire connections
Perform the following steps if DTC P0773 cannot be duplicated:
1. Read the information in the freeze frame data.
2. Use the data to determine the vehicle operating conditions when the DTC was set.
If any wiring repairs need to be made, refer to Repair Procedures.
DTC Confirmation Procedure
1. Turn the ignition switch to LOCK.
2. Connect the scan tool to data link connector (DLC).
3. Turn the ignition switch to ON.
4. Use a scan tool to clear the following items from the PCM memory:
^ The DTC
^ The pending DTC
^ The freeze frame data
5. Start the engine and warm to operating temperature.
6. Step firmly on the brake pedal.
7. Shift the manual selector to Drive (D).
8. Accelerate the vehicle to 80 km/h (50 mph) for 10 seconds.
9. Stop the vehicle.
10. Use a scan tool to inspect DTC P0773.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. The Diagnostic System Check - Vehicle, prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2. This step tests the shift solenoid for internal coil resistance.
3. This step tests for a short to ground in the BLU/WHT wire.
4. This step tests for a open in the BLU/WHT wire.
5. This step tests the condition of the transaxle internal electrical harness for damage.
6. This step tests for a short to voltage in the BLU/WHT wire.
7. This step tests for a poor electrical connection that may have caused the DTC to set.
8. This step inspects for a faulty PCM.
