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Author Topic: fault codes help please  (Read 1816 times)

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markey mark

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fault codes help please
« on: 11 February 2009, 10:43:19 »
just done paperclip test on mine after breaking down last nite and im getting codes
73 maf voltage
72 ????
31 no rpm signal

was expecting crank sensor but no ! just cut out coming up to a roundabout and would not go again any ideas on the 72 code  :(
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RobG

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Re: fault codes help please
« Reply #1 on: 11 February 2009, 12:08:37 »
Quote
just done paperclip test on mine after breaking down last nite and im getting codes
73 maf voltage
72 ????
31 no rpm signal

was expecting crank sensor but no ! just cut out coming up to a roundabout and would not go again any ideas on the 72 code  :(
72 Amplifier (Direct Ignition System (DIS)) control signal (A+B) Lead interruption, open circuit  :-?
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Marks DTM Calib

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Re: fault codes help please
« Reply #2 on: 11 February 2009, 12:41:20 »
Totally failing crank sensor Mark......as opposed to one with a crap signal.

Normaly a bit intermittent as its often due to a wire break
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markey mark

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Re: fault codes help please
« Reply #3 on: 11 February 2009, 13:23:34 »
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Totally failing crank sensor Mark......as opposed to one with a crap signal.

Normaly a bit intermittent as its often due to a wire break

have changed it mark still no joy  :( :(
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markey mark

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Re: fault codes help please
« Reply #4 on: 12 February 2009, 12:35:40 »
right then just fitted brand new gen vx crank sensor and brand new vx battery still no go ???? could it be dispac ?? :( :( :'(
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RobG

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Re: fault codes help please
« Reply #5 on: 12 February 2009, 12:39:23 »
Code 72 points that way :'(
Any spark at the plugs :question
« Last Edit: 12 February 2009, 12:41:03 by RobG »
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markey mark

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Re: fault codes help please
« Reply #6 on: 12 February 2009, 12:42:18 »
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Code 72 points that way :'(
Any spark at the plugs :question

thats me next check rob  :(
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RobG

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Re: fault codes help please
« Reply #7 on: 12 February 2009, 12:45:12 »
Thought you would have done that before whacking another crank sensor on ;)
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Marks DTM Calib

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Re: fault codes help please
« Reply #8 on: 12 February 2009, 12:46:42 »
72 is not a Motronic code.

Try disconnecting the MAF as a little test
« Last Edit: 12 February 2009, 12:48:41 by Mark »
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markey mark

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Re: fault codes help please
« Reply #9 on: 12 February 2009, 12:53:02 »
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Thought you would have done that before whacking another crank sensor on ;)

right checked got spark will go dissconect maf now
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markey mark

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Re: fault codes help please
« Reply #10 on: 12 February 2009, 12:56:49 »
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72 is not a Motronic code.

Try disconnecting the MAF as a little test

no different mark all lights going just battery light staying on ??
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Marks DTM Calib

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Re: fault codes help please
« Reply #11 on: 12 February 2009, 12:58:04 »
Ok, any vac leaks?

Does it start if you apply light throttle?
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markey mark

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Re: fault codes help please
« Reply #12 on: 12 February 2009, 12:59:55 »
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Ok, any vac leaks?

Does it start if you apply light throttle?

no but when towing home i jumped it off and it started but as soon as you take foot of pedal it dies deffo no vac leaks
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Re: fault codes help please
« Reply #13 on: 12 February 2009, 13:05:15 »
If it will run as described it does sudgest a possible vac leak or a sticking idle valve.

When it ran, was it lumpy or nice and smooth?
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RobG

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Re: fault codes help please
« Reply #14 on: 12 February 2009, 13:06:32 »
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Quote
72 is not a Motronic code.

Try disconnecting the MAF as a little test

no different mark all lights going just battery light staying on ??
Sorry, my mistake Code 72 relating to DIS is for the GM Multec ECU but I`m pretty sure on the Motronic 2.8.1 72 is the throttle switch not running on full load
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