48 · Steering & suspension

Controlled damping suspension (page 2 of 2)

Electrical 31 – Controlled damping suspensionControlled damping suspension · page 2 of 2

NOTE: Check that the steering is aligned correctly before carrying out this test (see "REPAIR MANUAL - MECHANICAL UNITS", Group 21)

TEST PROCEDURE	RESULT	CORRECTIVE ACTION
F1 CHECK "STRZ" SIGNAL - With the wheels perfectly aligned, engage the ignition key and check for 0V at pin A1 of control unit N46. Check for a variation in voltage when rotating the steering wheel.	OK	Carry out step F2
	NOT OK	Carry out step F4
F2 CHECK "STR1" SIGNAL - With the wheels perfectly aligned, engage the ignition key and check for voltage of 3-5 V at pin A6 of control unit N46. Rotating the steering wheel check that the voltage decreases to 0 V every 18° and vice-versa.	OK	Carry out step F3
	NOT OK	Carry out step F8
F3	CHECK "STR2" SIGNAL	OK NOT OK	Carry out test H Carry out step F9
- With the wheels perfectly aligned, engage the ignition key and check for a voltage of 0 V at pin A11 of control unit N46. Rotating the steering wheel check that the voltage increases to 3-5 V every 18° and vice-versa.		OK NOT OK	Carry out test H Carry out step F9
F5 CHECK VOLTAGE - Engage the ignition key and check for a difference in voltage of at least 5 V between pins A7 and A9 of control unit N46	OK	Restore wiring between: • pin A7 of N46 and pin A2 of N47, across pin B1 of connector G309b (RED) • pin A9 of N46 and pin A1 of N47, across pin B6 of connector G309b (BLK)
	NOT OK	Carry out step F6
F6 F6 CHECK SENSOR - Engage the ignition key and, disconnecting sensor L40, check for a difference in voltage lower than 5 V between pins A1 and A2 of sensor L40	OK	Check and if necessary replace electronic control unit N46
	NOT OK	Replace sensor L40

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Parts & tools for this job For 1992 Alfa Romeo 155

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