| First, I confirmed that the timing is not affected by the condition of the neutral switch. The ECU timing remained at 15 degrees for both conditions (both the timing value and the condition of the neutral switch were monitored using Datascan). This is true at least for an ECU with the MT program. I suspect the timing shift you're referring to is inherent in AT ECU's only. Are you currently running an AT or MT program in your ECU? Mine is running a MT program and I did not want to load an AT program just to confirm my suspicion. Second, as I suspected in my previous reply, the neutral condition is triggered by simply grounding Pin 44 on the ECU. This wire connects to the Engine Room harness through the brown connector next to the relay box under the hood (Y/L appears to mean yellow with a light blue stripe). In an MT Engine Room harness, this wire continues to the large connector for the alternator harness (and ultimately to the neutral switch via the alternator harness). In an AT Engine Room harness it instead goes to Pin 13 on the AT Control Unit (TCU) which resides next to the ECU. I confirmed that grounding Pin 13 on the TCU connector (which again leads to Pin 44 on the ECU) triggers the neutral condition. Again this was confirmed using Datascan. The solution is to connect the neutral switch to the Y/L wire on the Engine Room harness (again this is the wire which currently leads to Pin 13 on the TCU connector). To clarify, you can see the Y/L (yellow w/ light blue stripe) wire in this picture:
 A diagram of the TCU harness connector can be found in the ECCS wiring diagram foldout of the FSM. Here's a snapshot of it with Pin 13 highlighted:
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NA to TT, starting from the ground up... Proper check valve inspection per the FSM...
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