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Home >> Nissan-Datsun >> 1994 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Ignition Systems >> Start Signal >> Start Signal System Test
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Start Signal System Test

  1. Locate ECM harness connector. ECM is located under center of instrument panel (connector faces to rear of vehicle). Measure voltage between ground and ECM harness connector terminal No. 34 (Purple wire). See Figure . Turn ignition switch to START position. Battery voltage should be present in start position ONLY. Zero volts should be present in any other ignition switch position. If voltage is not as specified, go to next step. If voltage is as specified, system is functioning properly.
  2. Turn ignition off. Disconnect ECM harness connector. Disconnect ignition switch harness connector. Check continuity between ECM harness connector terminal No. 34 (Purple wire) and ignition switch harness connector terminal "f" (Black/Yellow wire). Continuity should exist. If continuity exists, check ECM and ECM harness connector terminals for correct installation, damage or corrosion. Repair as necessary. If continuity does not exist, repair open in harness or connectors between ignition switch and ECM harness connector.
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