Pinpoint Test C : P0645, P0646 Or P0647: Notes
WARNING: This page is about a different car, the 2016 Ford Transit-350 HD, 2016 Ford Transit-350, 2016 Ford Transit-250, and 2016 Ford Transit-150. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Manual Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
A/C Request. Refer to: Climate Control System - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0645 | A/C Clutch Relay Control Circuit | This DTC sets when the PCM grounds the relay circuit and more current than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and voltage is detected on the relay circuit. |
| P0646 | A/C Clutch Relay Control Circuit Low - (Diesel only) | (Diesel only) This DTC sets when the relay circuit is off and ground is detected on the relay circuit. The PCM expects to detect voltage coming through the relay coil to the relay circuit when it is not grounding it. |
| P0647 | A/C Clutch Relay Control Circuit High - (Diesel only) | (Diesel only) This DTC sets when the PCM grounds the relay circuit and excessive current draw (short to voltage) is detected on the relay circuit. |
Possible Sources
- Fuses
- Wiring, terminals or connectors
- A/C clutch relay
- PCM
Visual Inspection and Diagnostic Pre-checks
- Inspect for loose or corroded PCM and A/C clutch relay connections.
- Make sure BJB fuse 11 (10A) and fuse 38 (7.5A diesel) or fuse 39 (10A gas) are OK.