199003164 - P0657 Congruence of main relay battery voltage upstream/downstream

The error is detected if the voltage acquired from the control unit downstream of the main relay is greater than (with detail voltage above threshold) or less than (with detail voltage below threshold) the two calibrated levels

		Test results
1	RELAY POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check there are no faults in the main relay supply circuit by performing the    See Test 1060GL CHECK OPERATION OF MAIN ENGINE CONTROL UNIT RELAY	End of diagnosis	-	-