Pinpoint Test E : P1812:00, P1815:00: 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
The MSS communicates the operator's choice to the TCCM. The TCCM then controls the transfer case clutch, transfer case motor and IWEs as necessary. If the vehicle is not responding as intended, systematically check the necessary inputs and outputs of the TCCM, components of the transfer case, IWE components and halfshafts. Check all circuits for opens and shorts to power or ground.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1812:00 | 4-Wheel Drive Mode Select Circuit Failure: No Sub Type Information | This DTC sets when the TCCM senses an open circuit. 4WD system mode cannot be changed. |
| P1815:00 | 4-Wheel Drive Mode Select Short To Ground: No Sub Type Information | This DTC sets when the TCCM detects a short to ground. 4WD system mode cannot be changed. |
Possible Sources
- Wiring, terminals or connectors
- MSS
- Transfer case
- TCCM
WARNING:
When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.