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Home >> Acura >> 1990 >> Integra LS, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Manual Transmission Neutral Switch
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Manual Transmission Neutral Switch

  1. Connect PGM-FI test harness between ECU and ECU connectors. Turn ignition on. Place transmission in Neutral and measure voltage between ECU terminal B7 (positive) and A18 (negative). If voltage is NOT present, go to step 2). If there is voltage, disconnect manual transmission neutral switch 2-wire connector located on the side of the transmission. Connect Blue wire terminal to Black wire terminal. If voltage is NOT present, replace neutral switch. If voltage is present, repair open in Blue wire between ECU terminal B7 and neutral switch.
  2. Shift transmission into gear. If battery voltage is present, manual transmission neutral switch is okay. If battery voltage is NOT present, disconnect PGM-FI test harness connector "B" from main wire harness only; DO NOT  disconnect from ECU. If battery voltage is NOT present, substitute a known good ECU and recheck.
  3. If battery voltage is present, reconnect connector "B" and disconnect 2-wire connector on manual transmission neutral switch. If battery voltage is present, replace switch. If not, repair short in Blue wire between ECU and manual transmission neutral switch.
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