Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 155 Factory Service Manual (1992-1998)47 · Electrical 30 – ABS
47 · Electrical

Faulty safety relay

Make
Alfa Romeo
Model
155 Factory Service Manual
Year
1992–1998
Section
General system malfunction › Faulty safety relay
Electrical 30 – ABSFaulty safety relay
TEST STEP RESULT CORRECTIVE ACTION
A7CHECK GROUND SIGNALOK
NOT OK		Replace the "ABS malfunction" warning light on instrument panel C10
Carry out step A8
- Engage the ignition key and check, for a few seconds 0V at pin C2 of Instrument panel C10
A8 CHECK GROUND SIGNAL
- Engage the ignition key and check, for a few seconds
0V at pin 1 of G273		 OK Restore wiring between pin 1 of G273 and pin C2 of C10, across pin 2 of G124 (LTB-WHT). Also check the wiring between pin 4 of G272 and pin 2 of G124 (LTB-WHT).
NOT OK Replace the electronic control unit contained in N51

FAULTY SAFETY RELAY

TEST B

TEST STEP RESULT CORRECTIVE ACTION
B1 CHECK RELAY
- Check for correct operation of safety relay, (in group N51)		 OK carry out step B2
NOT OK Replace the relay
B2 CHECK VOLTAGE
- Check for 12 V at pin B7 of safety relay		 OK carry out step B3
NOT OK In this case there are probably some interruptions in the connection between pin 2 of G272 and pin B7 of the safety relay. Replace the group N51
B3 CHECK VOLTAGE
- Engage the ignition key and check for 12 V at pin B6 of safety relay		 OK carry out step B4
NOT OK In this case there are probably interruptions between pin 1 of G272 and pin B6 of safety relay. Replace group N51
B4 CHECK VOLTAGE
- Engage the ignition key and check for 12V at pin B6 of engine relay		 OK Replace the engine relay (see also test C)
NOT OK Replace group N51

Parts & tools for this job For 1992 Alfa Romeo 155

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