Jump to content

Reset engine codes


Recommended Posts

I Hope someone can help. Background: I have a 2016 Mercury 8.2 and changed the water pump. (It had a coolant leak at the weep hole)  I did the tear down, crossover and water pump  and with it (unplugged the electrical connections to the coolant temperature sensor and emissions sensor) as it was part of the requirement for access to the pump.

Now the problem: While the (coolant temperature sensor and emissions sensor connections) were disconnected, I turned the ignition key  to the power accessory on position to check some other work I was doing and unfortunately 2 faults were recorded in the PCM.

After putting everything back together (electrical connections too ) and then disconnecting the batteries for 2 hours, I turned the key to see that the faults still remain.

Is there a way to clear the codes without taking it to the marine dealer?  That would be $120 just to clear the codes.

Thanks for any advice 

Dennis

Link to post
Share on other sites

1) Ignition key “OFF”

2) Remove the cap from the Data Link Connector (DLC)

3) Slide the LED into the female terminals of position E and F on the DLC, making sure that the positive side goes into terminal F and the negative side into terminal E. No damage will occur if you get it backwards, it just won't work.

4) Turn the ignition key to the “ON” position. The LED should come on steady.

5) Insert the half paperclip into terminals A and B – This puts the engine in “Service Mode” and codes will begin to flash on the LED. On 1996 and earlier engines you may hear the fuel pump come on. If not you should be able to hear the Idle Air Control (IAC) motor move. Use care in this step, do not insert in the wrong terminals or ECM damage could result! Look closely, the terminals are clearly marked.

6) Read codes by observing LED flashs. If the self diagnostic system is working it will flash code 12 – one flash, pause, two flashes, long pause – it will repeat three times. If other codes are present they will flash in order of lowest to highest. Continue to read codes until the code 12 sequence is repeated.

You can also be clear codes (by moving the throttle to 100% and back) and set base timing while in Service Mode.

Link to post
Share on other sites

"You can also be clear codes (by moving the throttle to 100% and back..."

Bt Doctor, can you give my a step my step on how to clear the codes?  I know what caused the faults- (electrical sensors disconnected when powering on system), my brain fade for not thinking it through.

Link to post
Share on other sites

Thanks,  If I just wanted to clear the codes would the following sequence be correct?

1) Ignition key “OFF”

2) Remove the cap from the Data Link Connector (DLC)

4) Turn the ignition key to the “ON” position. The LED should come on steady.

5) Insert the half paperclip into terminals A and B – This puts the engine in “Service Mode” and codes will begin to flash on the LED. On 1996 and earlier engines you may hear the fuel pump come on. If not you should be able to hear the Idle Air Control (IAC) motor move. Use care in this step, do not insert in the wrong terminals or ECM damage could result! Look closely, the terminals are clearly marked.

Moving the throttle to 100% and back) MOVE ALL THE WAY FORWARD THEN BACK TO NEUTRAL? 

TURN KEY TO OFF POSITION. THE CODES SHOULD BE RESET?

Am I missing anything?

Thanks

Link to post
Share on other sites

Bt Doctur,

Your picture is accurate, but the terminals are not marked. From port side to starboard, there are four terminal wires: (black), (white with black stripe), (white with purple stripe), then (purple).

Which are terminals A and B?

Thanks

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...