: Plug your PSA VCI into the laptop via USB. You do not always need to connect it to the vehicle's OBD port just to check the firmware. Run the Utility : Launch the PSA Interface Checker.
| Symptom | Likely Cause | Action | |---------|--------------|--------| | No power LED | Blown OBD fuse (often F16/F17 in BSI) | Check fuse, repair short | | CAN High = 12V | Short to battery | Trace wiring, replace damaged harness | | CAN Low = 0V | Short to ground | Inspect for chafing near engine/steering | | CAN diff = 0V, both 2.5V | No active communication | Check ECU power/ground, try another ECU | | K-Line idle 0V | Open circuit | Check pin 7 continuity to ECU | | Intermittent connection | Loose terminal in OBD socket | Retension pins, clean with contact cleaner |
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Acceept: Plug your PSA VCI into the laptop via USB. You do not always need to connect it to the vehicle's OBD port just to check the firmware. Run the Utility : Launch the PSA Interface Checker.
| Symptom | Likely Cause | Action | |---------|--------------|--------| | No power LED | Blown OBD fuse (often F16/F17 in BSI) | Check fuse, repair short | | CAN High = 12V | Short to battery | Trace wiring, replace damaged harness | | CAN Low = 0V | Short to ground | Inspect for chafing near engine/steering | | CAN diff = 0V, both 2.5V | No active communication | Check ECU power/ground, try another ECU | | K-Line idle 0V | Open circuit | Check pin 7 continuity to ECU | | Intermittent connection | Loose terminal in OBD socket | Retension pins, clean with contact cleaner | psa interface checker