Circuit Description
The clutch pressure control (PC) solenoid valve 2 regulates modulator pressure based on the current flow from the powertrain control module (PCM). The PCM outputs varying amounts of amperage, as necessary for gear change, and the clutch PC solenoid valve 2 supplies oil pressure, proportional to the current, to the clutch PC solenoid valve 2 and the reverse clutch PC 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, a fault is detected and DTC P0966 sets. DTC P0966 is a type A DTC.
Conditions for Running the DTC
| • | No Clutch PC Solenoid Valve 1 DTCs P0746 or P0747. |
| • | No Shift Solenoid Valve Performance DTC P0751. |
| • | No Clutch PC Solenoid Valve 2 DTC P0777. |
| • | No Clutch PC Solenoid Valve 2 DTCs P0962 or P0963. |
| • | No SS 1 DTCs P0973 or P0974. |
| • | No SS 2 DTCs P0976 or P0977. |
| • | No SS 3 DTCs P0979 or P0980. |
| • | No TCC PC Solenoid Valve DTCs P2763 or P2764. |
| • | No TCC Enable Solenoid Valve DTCs P2769 or P2770. |
| • | System voltage is greater than 11 volts. |
| • | The engine is running for 1 second or greater. |
Conditions for Setting the DTC
| • | The clutch PC solenoid valve 2 current flow is 0.2 amp or less at 57-89% duty cycle. |
| • | The clutch PC solenoid valve 2 current flow is 0.4 amp or less at 90% or greater 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 P0966 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 AT clutch PC solenoid valve 2, 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 AT clutch PC solenoid valve 2 |
| • | Inspect for a PCM internal fault. |
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Engine Control? | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.5L (L66) |
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 |
3 |
Does the test lamp illuminate for 1 second? | Go to Step 8 | Go to Step 4 |
4 | Test the clutch pressure solenoid valve 2 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 |
5 | Test the clutch pressure solenoid valve 2 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 6 |
6 | Test the clutch pressure solenoid valve 2 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 7 |
7 | 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 |
8 | Inspect for poor connections at the clutch pressure solenoid valve 2. 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 |
9 | Replace the clutch pressure solenoid valve 2. 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) Types in Engine Controls - 3.5L (L66) | System OK |
