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Code 67 has now been eliminated. My 780 V8 is a 5 speed. The tranny has a plug with a pair of wires on it for the neutral gear circuit. When in neutral a pair of contacts close in the switch. These contacts are open in any other gear position.
I found a spare plug off the Ford harness under the hood that bring out pins 46 (signal return) and 30 NDS (neutral drive switch). In a Mustang there is a chassis harness which extends this connection to the tranny plug(neutral switch) and the clutch switch.
If this circuit is open a feed forward signal is initiated in the ECU in anticipation of a load and bumps up rpms a bit (same scenario when the a/c is turned on to keep the engine from bogging down).
The clutch switch and the tranny neutral switch are wired in parallel(pins 30 to 46).
When the clutch is to the floor there is continuity from pins 30 to 46. When the trans is in neutral there is continuity from pins 30 to 46.
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