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ENGINE CUTS OUT E.C.U.? 700 1989

HELLO!
I AM NEW TO THIS SITE,I LIVE IN THE U.K.AND DRIVE A 1989 VOLVO 760 GLE 2.8 V6 AUTOMATIC,WHICH IS IN EXCELLENT CONDITION,BUT THE ENGINE KEEPS CUTTING OUT,NO POWER AT THE COIL LOW TENSION TERMINAL,LEAVE IT FOR ABOUT 5 MINUTES AND IT WILL START AGAIN,RECENTLY GETTING WORSE,(OVER 1 HOUR A FEW DAYS AGO IN THE HOT WEATHER).
I DECIDED TO TRY AND TRACK THIS PROBLEM DOWN.
I CONNECTED A VOLT METER TO THE COIL L.T.TERMINAL,STARTED THE ENGINE IT RUNS FINE FOR VARIOUS LENGTHS OF TIME UNTIL IT CUTS OUT,NO POWER AT THE COIL L.T.
I HAVE CLEANED THE FLYWHEEL SENSOR,TESTED FOR CONTINUITY,O.K.AT THE TWO INNER WIRES TO THE SENSOR,BUT THE OUTER BRAID TYPE WIRE IS ONLY CONNECTED WITH THE TERMINAL AT THE PLUG (SHOULD IT BE CONNECTED TO EARTH i.e.THE SENSOR BODY).
I HAVE TRIED TURNING THE IGNITION SWITCH TO ON WITH THE FLYWHEEL SENSOR,AIR MASS METER AND POWER STAGE AMPLIFIER DISCONNECTED,LEAVE FOR A FEW MINUTES SAME EFFECT NO POWER AT COIL.
ANYWAY I HAVE TRACED BACK TO THE INJECTOR RELAY(464 BOTTOM CENTRE IN THE DIAGRAM)MOUNTED IN FRONT OF THE WATER EXPANSION TANK,INTERMITTENT POWER AT THE BLUE/YELLOW WIRE WHICH GOES BACK TO THE MOTRONIC/JETRONIC RELAY(135 TOP LEFT IN THE DIAGRAM)MOUNTED ON THE CENTRE CONSOL,I HAVE TAKEN THIS RELAY OUT AND CHECKED FOR DRY SOLDER JOINTS,BURNING etc.SEEMS O.K.

THERE'S POWER IN THE YELLOW/BROWN WIRE GOING INTO THE RELAY AND COMING OUT DOWN THE RED WIRE TO THE E.C.U.BUT I THINK THIS IS WHERE IT IS GOING OPEN CIRCUIT,THE RELAYS OPEN AND THEN NO POWER TO THE BLUE/YELLOW WIRE TO THE INJECTOR RELAY.
DOES ANYONE KNOW THE REST OF THE CIRCUIT FROM THE RED WIRE ENTERING THE E.C.U. IS SOME OTHER SENSOR CONNECTED TO THIS CIRCUIT GOING OPEN OR IS IT THE E.C.U.
IS IT REALLY NECESSARY FOR THE RED WIRE TO GO INTO THE E.C.U.,OR CAN I JUST EARTH THE RED WIRE TO THE BODYWORK AND COMPLETE THE CIRCUIT THROUGH THE RELAYS.
CAN ANYONE HELP.
PLEASE SEE WIRING DIAGRAM BELOW.







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New ENGINE CUTS OUT E.C.U.? [700][1989]
posted by  PEAKMAN  on Sat Jun 25 05:01 CST 2005 >


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