Diagnostic functions
- Make
- Alfa Romeo
- Model
- 147 Factory Service Manual
- Year
- 2000–2002
- Section
- Traction control › Diagnostic functions
Diagnostic functions
The ABS 5.7 control unit is able to carry out automatic diagnosis on the system and if a fault is found is able to:
deactivate the entire system
deactive the system partially (maintaining the ABS/EBD function)
A list of anomalies detectable by the control unit, warning light statuses and recovery strategies is given below.
| Error | ABS warning light | EBD warning light | VDC warning light | Recovery |
|---|---|---|---|---|
| electrical fault in rh front sensor | ON | OFF | ON | R3 |
| electrical fault in lh front sensor | ON | OFF | ON | R3 |
| electrical error in rh rear sensor | ON | OFF | ON | R3 |
| electrical error in lh rear sensor | ON | OFF | ON | R3 |
| error in rh front sensor | ON | OFF | ON | R3 |
| error in lh front sensor | ON | OFF | ON | R3 |
| error in rh rear sensor | ON | OFF | ON | R3 |
| error in lh rear sensor | ON | OFF | ON | R3 |
| rh front ABS discharge solenoid | ON | ON | ON | R4 |
| rh front ABS charge solenoid | ON | ON | ON | R4 |
| lh front ABS discharge solenoid | ON | ON | ON | R4 |
| lh front ABS charge solenoid | ON | ON | ON | R4 |
| lh rear ABS discharge solenoid | ON | ON | ON | R4 |
| lh rear ABS charge solenoid | ON | ON | ON | R4 |
| rh rear ABS discharge solenoid | ON | ON | ON | R4 |
| rh rear ABS charge solenoid | ON | ON | ON | R4 |
| Main valve 1 (VLV1) | ON | ON | ON | R4 |
| Main valve 2 (VLV2) | ON | ON | ON | R4 |
| Pilot valve 1 (USV1) | ON | ON | ON | R4 |
| Pilot valve 2 (USV2) | ON | ON | ON | R4 |
| Pump motor | ON | OFF | ON | R3 |
| Valve relay | ON | ON | ON | R2/R5 |
| NO - NC brake light switch | ON | OFF | ON | R3 |
| Side acceleration sensor (AY) | OFF | OFF | ON | R4 |
| Yawing sensor | OFF | OFF | ON | R4 |
| Brake fluid pressure sensor | ON | OFF | ON | R3 |
| Lambda 6 (magnetic wheel malfunction) | ON | ON | R1 | |
| NOTB (implementation anomaly) | ON | OFF | ON | R5/R3 |
| Steering angle sensor | OFF | OFF | ON | R4 |
| CAN-BUS network | OFF | OFF | ON | R4 |
| Engine CAN message errors | OFF | OFF | ON | R4 |
| Junction | ON | ON | ON | R1 |
| Supply voltage | ON | ON | ON | R2 |
| Variant Coding (incorrect vehicle configuration received from CAN network) | ON | ON | ON | R1 |
| Communication with fault warning lights | ON | ON | ON | ON |
R1 - System deactivation
R2 - VDC/ASR,ABS,EBD deactivation
R3 - VDC/ASR,ABS deactivation
R4 - VDC/ASR deactivation
R5 - Inhibition of VDC/ASR and ABS during malfunction
R6 - Store fault without disabling system
NOTE:
Although the system is connected to the C-CAN line, it comes with its own diagnostic line known as the K line. The system may be diagnosed by connecting a Tester to the tester connection on the N.B.C. (body computer node).
Parts & tools for this job For 2000 Alfa Romeo 147
- TOOLOBD2 scannerSearch: OBD2 scanner
- TOOLDigital multimeterSearch: automotive digital multimeter
- TOOLBack-probe test leadsSearch: back probe test leads
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