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225 optimax efi alarm problem

M

mnydvr

Regular Contributor
"before I use a gallon of gas

"before I use a gallon of gas and a road flare to solve this problem,let me run it by you guys ,starts and runs fine,run rpm's up to about 3000,get a steady alarm,stays on.shut it down and will idle all day,run it up.....steady alarm,temp running 145-155,disconnected temp alarm wires one at a time,no change,anybody got anything?I would much rater solve this than tell the customer he needs to take it to the dealer for a diagnostic,HELP!oh yeah,the oil is full!"
 
"Gday Danny
Sounds like the s

"Gday Danny
Sounds like the shift switch may be ur problem, the engine has a neutral rpm limit of about 3000 rpm, so if ur in gear but the switch is telling the PCM the engine is in neutral this might be ur problem. Use ur DDT to have a look.

Cheers Spanaman"
 
"span,
I'm gonna have to

"span,
I'm gonna have to dig a little further,only one motor is blowing a code and I've only had them in neutral,also, I'm assuming the both semm to "flatten" out in neutral at 3000 due to the timing advance,correct?is your theory applicable knowing I've only been in neutral,also "DDT"?.I gotta' go put the new stats in tomorrow so I'll get back you then,someone told me today that a solid alarm could be a problem that will need the diagnostic computer to find,whatdo you think mate?
cheers till morrow!"
 
"So you got a twin rig or some

"So you got a twin rig or something? If ur running the engines in neutral then u should get an alarm at 3000 rpm and it should start misfiring (rev limiter), in gear on the other hand they should go over 5500 rpm before the limiter cuts in. U need to test ur shift switches, disconnect them and do an ohms test in and out of gear the switch should be open in neutral and closed in gear or vica versa. If u find the switches are ok then u might have a block pressure fault, also check that the engines are charging. DDT = Digital Diagnostic Terminal, mercury's scan tool its old now days but will still work on current production engines, well in Oz anyway. The old days of disconnecting sensors to see what shuts up the horn doesn’t go well these days since the PCM is always looking for sensors that are outside the programmed parameters, this will actually cause a fault and trigger an alarm. Plugging in the DDT will pretty much point you to what is at fault."
 
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