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ESA INTERRUPTER SWITCH AND MODULE QUESTION

J

jfaz

Member
"I HAVE 1990 OMC COBRA 4.3L &#

"I HAVE 1990 OMC COBRA 4.3L (M#432APRPW5),CAN SOMEBODY TELL ME HOW TO TEST THE ESA SWITCH AND SHIFT ASSIST MODULE, BECOUSE IS TO HARD TO SHIFT OR NO SHIFT ARE ALL WHEN IS UNDER LOAD,WHEN IS OUTSIDE WHATER OR ENGINE OFF SWITH PERFET. TKS,FOR YOUR HELP"
 
start motor in neutral and fi

start motor in neutral and find switch located on shift cable bracket with a arm on it that fits inside a "v" and depress it. If the motor RPM's don't drop the Shift assist module is most likely Faulty. This is usally 90% of the time the problem for not being able to shift in and out neutral.
 
"Would just like to add a bit

"Would just like to add a bit to Tom's answer, if the ESA test doesn't work, it's possible it's the module but there are a few other things I would check before buying a new one, the other switch (overstroke) is wired in series with the interrupt switch, it must be working in the closed position for the ESA to work. Make sure there is no corrosion inside the 2 black connectors. Check all wires that are soldered to the switches, make the overstroke switch actually switches, some guys tighten the 2 screws so much it binds. Also there is a 2 wire plug on the ESA, the purple wire must feed 12v to the ESA and lastly in the wiring harness there is a ground lug that must be securely fastened to ground for the ESA to work."
 
Can you help.
I have a 1993 OMC cobra 5.8 L. I do not have the wiring diagram for ESA , interrupter, over stroke switches. I need clarification on the switches being normally open or normally closed.
I had my lower drive rebuilt and I have also installed a new transom shift cable, as well as the remote console shift, and throttle cables.
A written description of the ESA function with the two switches and the wiring diagram would be great. Thank you.
 
The interrupt switch is normally open and the overstroke switch is normally closed.
This is from my OMC shop manual:
for the interrupt:
After disconnecting the plug for the ESA behind the shift cable bracket. insert the test probes into the male connector plug (blue leads). Ohmmeter should be set on the high ohms scale. With the control system in neutral, the ohmeter should show infinity.
Manually lower and raise the load lever, this will trigger the level on the interrupt switch. The meter must show a zero reading when held in either direction. Replace the switch if it fails to show zero under this test.
For the overstroke:
now for this you are moving your ohmmeter probes to the cavity with the black leads....
with the control in neutral, the meter must show a zero reading.
manually depress the overstroke switch stud, the meter must show infinity. Replace the overstroke switch if this is not the case.
If you don't have an OMC shop manual for your model and you're going to have this boat for a while, I think it's going to be very helpful to have one! I use mine all the time.
 
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