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:
- Read the information in the freeze frame data.
- Use the data to determine the vehicle operating conditions when the DTC was set.
If any wiring repairs need to be made, refer to Wiring Repairs .
DTC Confirmation Procedure
- Turn the ignition switch to LOCK.
- Connect the scan tool to data link connector (DLC).
- Turn the ignition switch to ON.
- Use a scan tool to clear the following items from the PCM memory:
- Start the engine and warm to operating temperature.
- Step firmly on the brake pedal.
- Shift the manual selector to Drive (D).
- Accelerate the vehicle to 80 km/h (50 mph) for 10 seconds.
- Stop the vehicle.
- Use a scan tool to inspect DTC P0773.
| • | The DTC |
| • | The pending DTC |
| • | The freeze frame data |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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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.
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This step tests the shift solenoid for internal coil resistance.
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This step tests for a short to ground in the BU/WH wire.
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This step tests for a open in the BU/WH wire.
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This step tests the condition of the transaxle internal electrical harness for damage.
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This step tests for a short to voltage in the BU/WH wire.
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This step tests for a poor electrical connection that may have caused the DTC to set.
-
This step inspects for a faulty PCM.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Transmission Controls Schematics | ||||
Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | ||
Does the scan tool display any other DTCs in addition to P0773? | -- | Go to applicable DTC table | Go to Step 3 | |
Is the resistance equal to the specified value? | ∞ | Go to Step 4 | Go to Step 9 | |
Use the DMM in order to measure the resistance between the PCM harness connector CZ terminal 13 and the transaxle connector terminal 2. Is the resistance less than the specified value? | 2 Ω | Go to Step 5 | Go to Step 10 | |
Is the action complete? | -- | Go to Step 15 | -- | |
Is the voltage less than the specified value? | 2 V | Go to Step 7 | Go to Step 11 | |
Inspect all of the electrical connections for poor terminal contact or poor connection. Is poor terminal contact or connection evident? | -- | Go to Step 12 | Go to Step 8 | |
Does DTC P0773 reset? | -- | Go to Step 14 | Go to Step 13 | |
9 | Repair the short to ground in the BU/WH wire between the PCM and the torque converter clutch (TCC) solenoid. Is the action complete? | -- | Go to Step 15 | -- |
10 | Repair the open or high resistance in the BU/WH wire between the PCM and the torque converter clutch (TCC) solenoid. Is the action complete? | -- | Go to Step 15 | -- |
11 | Repair the short to voltage in the BU/WH wire between the PCM and the TCC solenoid. Is the action complete? | -- | Go to Step 15 | -- |
12 | Repair the terminals or connections that exhibit poor contact. Is the action complete? | -- | Go to Step 15 | -- |
13 | Refer to the Diagnostic Aids for a possible intermittent condition. If OK, replace the PCM. Refer to Powertrain Control Module Programming and Setup . Is the action complete? | -- | Go to Step 15 | -- |
14 | Refer to Diagnostic Aids for additional information regarding DTC P0773. Is the action complete? | -- | Go to Step 15 | -- |
15 |
Are any DTCs displayed on the scan tool? | -- | System OK | |
