17072/P0688/001672
From Ross-Tech Wiki
17072/P0688/001672 - ECM Power Relay Load Circuit: (J271): Open Circuit
Possible Symptoms
- Engine Coolant Fan running at full Speed while Ignition is OFF and Engine is COLD (could lead to discharged Battery)
Possible Causes
- Fuse(s) faulty
- Power Supply Relay for Engine Control Module (J271) faulty
- Terminal 87 faulty/hanging
- Wiring between Engine Control Module (J220) and Power Supply Relay for Engine Control Module (J271) faulty
Possible Solutions
- Check/Replace Power Supply Relay for Engine Control Module (J271)
- Check Wiring between Engine Control Module (J220) and Power Supply Relay for Engine Control Module (J271)
- Check/Replace Engine Control Module (J220)
Special Notes
- When found in a 2005 through 2007 2.5L NAR (North American Region) (1K) Jetta check the T121/62 (Red/Black) traced power wire to the ECM. If power is missing or a voltage drop is present that wire may be damaged anywhere between 6" and 18" from the connector itself. This will result in no communication in addition to a no-start.
- Based on 2.5L Jetta feedback over the years a majority look like this example however some are damaged further away per this example: with the close-up and distant views.
