Pinpoint Test K : P1825:00, P1826:00 And P1827:00: Notes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Two Wheel Drive/Four Wheel Drive Systems for schematic and connector information
Normal Operation
When the operator selects a transfer case mode from 2H mode, the TCCM engages a clutch for approximately 5 seconds to synchronize the front and rear driveshafts allowing a mechanical engagement of the transfer case. The TCCM also removes the ground path from the IWE solenoid, which removes vacuum from the IWEs, allowing them to engage the front axle shaft. Systematically check the necessary inputs and outputs at the TCCM, internal components of the transfer case, IWE components and drive axles.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1825:00 | 4-Wheel Drive Clutch Relay Open Circuit: No Sub Type Information | This DTC sets when TCCM detects an open circuit. The TCCM disables transfer case clutch operation. |
| P1826:00 | 4-Wheel Drive Low Clutch Relay Circuit To Battery: No Sub Type Information | This DTC sets when TCCM detects a short to voltage. Transfer case clutch operation, though disabled by the TCCM, is fully engaged when this DTC is present. |
| P1827:00 | 4-Wheel Drive Low Clutch Relay Circuit To Ground: No Sub Type Information | This DTC sets when TCCM detects a short to ground. The TCCM disables transfer case clutch operation. |
Possible Sources
- Fuse
- Wiring, terminals or connectors
- TCCM
- Transfer case
- Front axle assembly
- Transfer case clutch