45 · Engine

Test o

Make: Alfa Romeo
Model: 155 Factory Service Manual
Year: 1992–1998
Section: Irregular ignition (6V model) › Test o

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Electrical 29 – Motronic ignition and injectionTest o

TEST O

TEST PROCEDURE	RESULT	CORRECTIVE ACTION
O1 CHECK SPARK PLUGS (*) - Visually check the condition of the spark plugs.	OK	Carry out step O2
	NOT OK	Replace faulty spark plugs A12
O2 CHECK CABLES (*) - Check that the cables connecting the coils and spark plugs are not damaged. - Check for a total resistance between coils and spark plugs, including the suppressors of approximately 2.5 kΩ	OK	Carry out step O3
	NOT OK	Replace the faulty cables or suppressor
O3 CHECK COIL - Check total resistances of circuits of coil A8: • main (pin 1-4, 2-4 and 3-4) approximately 0.5 Ω • secondary approximately 13.3 kΩ	OK	Carry out step O4
	NOT OK	Replace coil A8
O4 CHECK VOLTAGE - Check for 12 V at pin 4 of coil A8	OK	Carry out step O6
O4 CHECK VOLTAGE - Check for 12 V at pin 4 of coil A8	NOT OK	Carry out step O5
O5 CHECK VOLTAGE - Check for 12 V at pin 87 of relay S12d	OK	Restore wiring between pin 4 of A8 and pin 87 of S12d (GRN-BLK)
O5 CHECK VOLTAGE - Check for 12 V at pin 87 of relay S12d	NOT OK	Carry out test B
O6 CHECK CONTINUITY - Check for continuity between coil A8 and the control unit S11, and precisely between: • pin 3 of A8 and pin 24 of S11 • pin 2 of A8 and pin 51 of S11 • pin 1 of A8 and pin 25 of S11	OK	Replace coil A8
	NOT OK	Restore wiring between: • pin 3 of A8 and pin 24 of S11 (WHT) • pin 2 of A8 and pin 51 of S11 (GRN) • pin 1 of A8 and pin 25 of S11 (RED)

(*) The presence of burnt petrol will irreparably damage the catalytic exhaust: do not therefore remove the spark plug cables when the engine is running

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Parts & tools for this job For 1992 Alfa Romeo 155

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