Neutral Switch (M/T): Miata

1. Continuity Inspection
   
   Disconnect neutral switch 2-pin harness connectors. Using ohmmeter, check continuity between neutral switch terminals. Ensure continuity is present with transmission in neutral (button on switch is pushed) and is not present in any other gear. If continuity is not present, go to next step. If neutral switch operation is not as specified, replace neutral switch.
2. Open Circuit Inspection
   
   Disconnect PCM 31-pin harness connector. Check for continuity between following:
   • Power circuit - Neutral switch harness connector terminal "A" (Violet wire) and PCM 31-pin harness connector terminal No. 4H (through common connector).
   • GND circuit - Neutral switch harness connector terminal "B" (Black wire) and ground (through common connector).

   If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

3. Short Circuit Inspection
   
   Check continuity in signal circuit between neutral switch harness connector terminal "A" (Violet wire) and PCM 31-pin harness connector terminal No. 64 (through common connector). If continuity is present, repair short circuit to ground in Violet wire between neutral switch harness connector terminal "A" and PCM 104-pin harness connector terminal No. 64.

If there is no open or short circuit present, replace neutral switch.