Hellman350
Cadet
- Joined
- Jan 12, 2020
- Messages
- 10
I seem to have an issue with a MCM 5.0L MPI engine (SN 1A082100) in which the shift inhibit does not seem to function.
I have been finding shift form FWD to N is difficult, so went and inspected and adjusted cables, all is in good condition. So I decided to ensure the actual switch was working by manually actuating it whist engine was running, expecting to hear it stumble or die a little. The engine does not falter. I actuated the switch while on the water in FWD at idle, with no stumble. I have tested the switch with a multimeter and am receiving the correct resistance between pins A and C when actuated and not actuated, and have 10K between B and C as per the schematic. Using spoons in behind the wires I can see I have 5VDC supplied to the switch, and a good earth where required. Using spoons again, I have 0VDC at shift inhibit input on connector B pin 19 when switch is not activated, and a steady 5VDC when switch actuated. Wiggle test has no fluctuations of voltage.
Is there any other inputs I can check, at this stage it appears it may be an issue with the controller, however my experience with controllers is that this is unlikely if everything else is functioning properly. Drive system performs flawlessly in every other sense, has only 120hrs on it.
Would love to hear form anyone as to where I go from here, thanks?
I have been finding shift form FWD to N is difficult, so went and inspected and adjusted cables, all is in good condition. So I decided to ensure the actual switch was working by manually actuating it whist engine was running, expecting to hear it stumble or die a little. The engine does not falter. I actuated the switch while on the water in FWD at idle, with no stumble. I have tested the switch with a multimeter and am receiving the correct resistance between pins A and C when actuated and not actuated, and have 10K between B and C as per the schematic. Using spoons in behind the wires I can see I have 5VDC supplied to the switch, and a good earth where required. Using spoons again, I have 0VDC at shift inhibit input on connector B pin 19 when switch is not activated, and a steady 5VDC when switch actuated. Wiggle test has no fluctuations of voltage.
Is there any other inputs I can check, at this stage it appears it may be an issue with the controller, however my experience with controllers is that this is unlikely if everything else is functioning properly. Drive system performs flawlessly in every other sense, has only 120hrs on it.
Would love to hear form anyone as to where I go from here, thanks?