Pinpoint Test L : TCC, LPC Solenoids: Notes
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
| Refer to Wiring Diagram
for schematic and connector information. Normal Operation and Fault Conditions When the electrical connector or solenoid is disconnected, inspect the connector for terminal condition, corrosion and contamination and the connector seal for damage. Also inspect the connector seal for damage. Clean, repair or install new components as required. If the power circuit to the transmission solenoids fails open, then all solenoids are failed electrically off. Check for an open, short to ground or the transmission connector disconnected. The TCC is controlled by a directly proportional solenoid. Like the shift solenoids the TCC solenoid is controlled by a "smart driver" capable of detecting open, short to ground and short to power faults. In the event of an open circuit or short to power fault the TCC circuit is failed open. The TCC and LPC solenoids share a high side driver. Anytime power is removed the transmission defaults to MAX line pressure with open TCC. LPC is controlled by an inversely proportional solenoid (0 current = max pressure, max current = min line pressure). The LPC solenoid is controlled by a "smart driver" capable of detecting open, short to ground or short to power faults. DTC Fault Trigger Conditions |
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| TCM P0740:00 | Torque Converter Clutch Solenoid Circuit/Open: No Sub Type Information | This DTC sets if the TCM detects an open in the TCC solenoid circuitry. |
| TCM P0743:00 | Torque Converter Clutch Solenoid Circuit Electrical: No Sub Type Information | This DTC sets if the fault was not present long enough for the TCM to determine a more specific fault. If a more specific DTCs such as P0740 or P2769 are set resolve them first. |
| TCM P0748:00 | Pressure Control Solenoid "A" Electrical: No Sub Type Information | This DTC sets if the fault was not present long enough for the TCM to determine a more specific fault. If a more specific DTCs such as P0960, P0962 or P0963 are set resolve them first. |
| TCM P0960:00 | Pressure Control Solenoid "A" Control Circuit/Open: No Sub Type Information | This DTC sets if the TCM detects an open in the pressure control solenoid circuitry or in the pressure control solenoid. |
| TCM P0961:00 | Pressure Control Solenoid "A" Control Circuit Range/Performance: No Sub Type Information | This DTC sets if the TCM detects a short to ground, a short to power or an open in the pressure control solenoid circuitry or a short or open in the pressure control solenoid. |
| TCM P0962:00 | Pressure Control Solenoid "A" Control Circuit Low: No Sub Type Information | This DTC sets if the TCM detects a short to ground in the pressure control solenoid circuitry or a short in the pressure control solenoid. |
| TCM P0963:00 | Pressure Control Solenoid "A" Control Circuit High: No Sub Type Information | This DTC sets if the TCM detects a short to power in the pressure control solenoid circuitry. |
| TCM P2769:00 | Torque Converter Clutch Circuit Low: No Sub Type Information | This DTC sets if the TCM detects a short to ground in the TCC circuitry or a short in the TCC solenoid. |
Possible Sources
Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
TCC and LPC solenoid(s)
Main control wiring harness
Transmission internal wiring harness
TCM