Diagnostics
Electrical faults and certain mechanical faults detected by the electronic control unit can be diagnosed using the blink code and diagnostic tools.
Blink Code
The EDC is designed to provide information on engine faults. The warning light comes on when the engine is running to indicate that a fault has occurred:
| Warning light on | Serious faultDegraded system function |
| Warning light blinking | Very serious faultDegraded system function Loss of one or more safety functions and possible engine stop |
To check the fault, use the diagnostic button located under the UCI compartment hatch, which has another EDC warning light working in parallel with the one on the dashboard.
Dashboard warning lights
Fault checking/identification procedure
- Stop the vehicle and switch off the engine (STOP);
- Turn key to RUN (warning lights on and engine off);
- Press the diagnostic button and check that the EDC warning light flashes once;
- After a short interval during which the warning light remains off, it begins to flash, first at long intervals and then at shorter intervals.
EDC Diagnostic Button
The fault code is explained on the following pages.
For example: Code 1.4 means that the warning light has given one long flash and four short flashes. The procedure should be repeated until the code of the first fault displayed is repeated.
- Procedure for clearing the fault memory from the driving position
- Press the flashing code button (hold down the button);
- Turn the key to RUN while holding down the button;
- Wait 5 seconds;
- Turn the key to stop;
- Verify clearing by reading the number with the test button.
EDC electronic control unit blink code table
| Blink Code | EDC warning light * | Fault |
| VEHICLE AREA | ||
| 1.1 | ON | Vehicle speed sensor |
| 1.2 | ON | Torque selector |
| 1.3 | OFF | Cruise control |
| 1.4 | ON | Accelerator pedal |
| 1.5 | OFF | Clutch pressure switch |
| 1.6 | ON | Brake pedal switch signal plausibility |
| 1.7 | OFF | Plausibility between brake / accelerator pedal |
| ENGINE AREA | ||
| 2.1 | OFF | Water temperature sensor |
| 2.2 | OFF | Air temperature sensor |
| 2.3 | OFF | Fuel temperature sensor |
| 2.4 | ON | Turbo pressure sensor |
| 2.5 | OFF | (Control unit) ambient temperature sensor |
| 2.6 | ON | Engine braking switch signal |
| 3.5 | OFF | Battery voltage |
| TURBO AREA | ||
| 4.1 | OFF | Turbo actuator pressure sensor |
| 4.2 | ON | Turbine revs sensor |
| 4.3 | ON | Turbine overspeed |
| 4.4 | ON | Turbo management (mechanical fault) |
| 4.5 | ON | VGT solenoid valve |
| 4.6 | BLINKING | Engine braking solenoid valve |
| INJECTORS | ||
| 5.1 | ON | Cylinder 1 injector fault |
| 5.4 | ON | Cylinder 4 injector fault |
| 5.2 | ON | Cylinder 2 injector fault |
| 5.6 | ON | Cylinder 6 injector fault |
| 5.3 | ON | Cylinder 3 injector fault |
| 5.5 | ON | Cylinder 5 injector fault |
| ENGINE REVS SENSOR | ||
| 6.1 | ON | Flywheel sensor |
| 6.2 | ON | Valve train sensor |
| 6.4 | OFF | Engine overspeed |
| INTERFACE WITH OTHER CONTROL UNITS | ||
| 7.1 | OFF | P.W.M. ABS/ASR interface |
| 7.2 | OFF | CAN line |
| 7.3 | OFF | CAN line (ASR management) |
| 7.4 | OFF | CAN line (gearbox data management) |
| ENGINE CONTROL UNIT | ||
| 9.1 | BLINKING | Faulty control unit |
| 9.2 | ON | EEPROM data incorrect |
| 9.3 | BLINKING | Immobilizer |
| 9.4 | ON | Main relay |
| 9.5 | ON | Engine stop procedure error |
| 9.6 | ON | Control unit data recording error |
| * Blink code warning light off – Slight faultBlink code warning light on – Serious faultBlink code warning light blinking – Very serious fault | ||
