Circuit Description
The torque converter clutch (TCC) pressure control (PC) solenoid valve regulates modulator pressure, based on the current flow from the powertrain control module (PCM). The PCM outputs a varying amount of amperage, as necessary for TCC application. The TCC PC solenoid supplies oil pressure proportional to the current to the TCC PC solenoid and the lock-up timing valve. The PCM monitors the current flowing through the solenoid and performs feedback control.
If the current is not within the specified range for a given duty output, DTC P2764 sets. DTC P2764 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2764 Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage
Conditions for Running the DTC
| • | No Clutch PC Solenoid 1 DTCs P0746 or P0747. |
| • | No SS Valve Performance DTC P0751. |
| • | No Clutch PC Solenoid 2 DTC P0777. |
| • | No Clutch PC Solenoid 1 DTCs P0962 or P0963. |
| • | No Clutch PC Solenoid 2 DTCs P0966 or P0967. |
| • | No SS 1 DTCs P0973 or P0974. |
| • | No SS 2 DTCs P0976 or P0977. |
| • | No SS 3 DTCs P0979 or P0980. |
| • | No TCC Enable Solenoid DTCs P2769 or P2770. |
| • | System voltage is greater than 11 volts |
Conditions for Setting the DTC
| • | TCC PC solenoid valve current flow is 0.2 amp or less at 57-89% TCC duty cycle. |
| • | TCC PC solenoid valve current flow is 0.4 amp or less at 90% or greater TCC duty cycle. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL). |
| • | The PCM limits the transmission shift to 4th gear. |
| • | 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 P2764 in PCM history. |
Conditions for Clearing the MIL/DTC
| • | 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. |
Diagnostic Aids
| • | Inspect the connectors at the PCM, the TCC PC solenoid, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Wiring Systems. |
| • | Inspect for a faulty TCC PC solenoid. |
| • | Inspect for a PCM internal fault. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for voltage at the coil side of the TCC PC solenoid valve.
-
This step verifies that the PCM is providing ground to the TCC PC solenoid valve.
-
This step tests for constant ground to the TCC PC solenoid valve.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Has the test run and passed? | Go to Diagnostic Aids | Go to Step 3 |
Does the test lamp illuminate for 1 second? | Go to Step 6 | Go to Step 4 | |
Test the TCC PC solenoid valve low control circuit for an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 5 | |
Test the TCC PC solenoid valve low control circuit for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 | |
6 | Inspect for poor connections at the TCC PC solenoid valve. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
7 | Test the TCC PC solenoid valve high control circuit for an open or a short to ground. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
8 | Inspect for poor connections at the PCM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
9 | Replace the TCC PC solenoid valve. Refer to A/B Clutch Pressure Control Solenoid Assembly Replacement . Did you complete the replacement? | Go to Step 11 | -- |
10 |
Important: Always perform the PCM set up procedure.
Did you complete the replacement? | Go to Step 11 | -- |
11 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | Go to Step 12 | Go to Step 2 |
12 | With the scan tool, observe the stored information, capture info. and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
