Pinpoint Test I : Pressure Control Solenoid A: Notes
Diagnostic Overview
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.
Refer to Transmission Controls-6F35 for schematic and connector information.
Normal Operation and Fault Conditions
The TCM controls the hydraulic line pressure by varying the amount of current applied to the LPC solenoid. When no current is applied to the LPC solenoid, the LPC solenoid is fully opened, resulting in the maximum amount of hydraulic pressure to the main pressure regulator valve. When maximum current is applied, the LPC solenoid is fully closed, resulting in minimum pressure to the main pressure regulator valve.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0748 | LPC A Electrical | LPC electrical circuit general fault. May set along with P0960, P0962 and P0963. |
| P0960 | LPC A Control Circuit Open | Open circuit in solenoid or solenoid circuitry. |
| P0961 | LPC A Control Circuit Range/Performance | Intermittent short to ground in solenoid or solenoid circuitry. |
| P0962 | LPC A Control Circuit Low | Short to ground in solenoid or solenoid circuitry. |
| P0963 | LPC A Control Circuit High | Short to power in solenoid circuitry. |
Possible Sources
- Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
- LPC
- TCM