Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 145/146 Electrical System Diagnosis Manual, Volume 3 (1994-2001)01 · 145 electrical system diagnosis
01 · Diagnostics

Manual diagnosis (page 2 of 8)

Make
Alfa Romeo
Model
145/146 Electrical System Diagnosis Manual, Volume 3
Year
1994–2001
Section
Anti Theft Device
145 electrical system diagnosisManual diagnosis · page 2 of 8
PRELIMINARY CONTROL UNIT CHECK (N45)TEST A
TEST PROCEDURERESULTCORRECTIVE ACTION
A1CHECK FUSES
– Check the intactness of fuses F1 and F16 of fusebox G1		OKCarry out step A2
NOT OKChange fuses F1 and/or F16
A2CHECK VOLTAGE
– Check for 12 V at pin A3 of control unit N45		OKCarry out step A3
NOT OKRestore the wiring between pin A3 of N45 and the branch terminal board
A3CHECK VOLTAGE
– With the ignition key turned, check for 12 V at pin B12 of control unit N45		OKCarry out step A4
NOT OKRestore the wiring between pin B12 of N45 and the fusebox G1
A4CHECK EARTH
– Check that pin A9 of control unit N45 is earthed (0 V)		OKCarry out step A5
NOT OKRestore the wiring between pin A9 of N45 and earth G63b
A5CHECK SERIAL CONNECTION
– Check the continuity of the connection between pin A2 of N45 and pin 2 of receiver N67		OKCarry out step A6
NOT OKRestore the wiring between N67 and N45
A6CHECK CONTINUITY
– Check the continuity of the cables:
- between pin A6 of N45 and pin 3 of diagnosis connector T7
- between pin 2 of T7 and earth G63b		OKCONNECT TO THE DIAGNOSIS SOCKET T7 AND CONTINUE OPERATIONS WITH THE ALFA TESTER, OR FOLLOW THE INSTRUCTIONS OF THE LED THAT SIGNALS THE RESULTS OF SYSTEM SELF-DIAGNOSIS
NOT OKRestore the wiring between T7, N45 and G63b

Parts & tools for this job For 1994 Alfa Romeo 145/146

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