18 · Diagnostics

B02 Starter motor not working

Fault diagnosisB02 Starter motor not working

When the key is turned to the On position the instruments light up, but the starter motor does not turn

Step	Test procedure	Result	Action
1	CHECKING STARTER MOTOR POWER SUPPLY Check that the supply lead between battery and starter motor is undamaged and properly secured	OK	Move onto step 2
1		loose fastenings on lead	Secure lead End of diagnosis
2	CHECKING STARTER MOTOR RELAY POWER SUPPLY Check the connection between switch and relay	OK	Move onto step 3
2		Lack of continuity	Use a tester to check if the lack of continuity is between switch and engine bay control unit, or in the engine bay between engine bay control unit and starter motor relay. Wiring diagram E5010 IGNITION AND RECHARGING If the lack of continuity is in the control unit, replace the control unit. Otherwise repair the lead in question. End of diagnosis
3	CHECKING SWITCH Check the switch is working and undamaged. Operate the switch	OK	Move onto step 4
3		Lack of contact at pin 50	Replace switch Op. 5520A12 End of diagnosis
4	CHECKING CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
4		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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