P0688

SAE VAG Description
P0688 17072 ECM/PCM Power Relay Sense Circuit /Open

J220 - Motronic Engine Control Module (ECM)
- Engine Control Module (ECM) Function.
- Engine Control Module (ECM), replacing.
- Voltage supply for Engine Control Module (ECM), checking. Voltage Supply For Control Module, Checking

Note: Check Motronic Engine Control Module (ECM) power supply according to wiring diagram.