1993 Nissan-Datsun Sentra SE-R, AutomaticFACTORY OEM SERVICE PROCEDURE

Start Signal System Test (300ZX)

  1. Locate ECM harness connector. ECM is located below glove box. Measure voltage between ground and ECM harness connector terminal No. 43 (Black/Yellow wire). See Figure and 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. Disconnect battery B + terminal connector at battery (White wire). Check continuity between ECM harness connector terminal No. 43 (Black/Yellow wire) and ignition switch harness connector terminal No. 5 (Black/Yellow wire). Refer to Fig 1 . 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.
  3. Check continuity between ignition switch harness connector terminal No. 1 (White wire) and battery B + terminal connector at battery (White wire). See Fig 1 . Continuity should exist. If continuity does not exist, repair open in harness or connectors between ignition switch and battery B + terminal connector at battery (White wire). Check Green fusible link located in fusible link holder next to battery. Check 10-amp fuse located in fuse box under left instrument panel. Repair or replace as necessary.
Fig 1: Testing Start Signal (300ZX)
G93A79939Courtesy of NISSAN MOTOR CO., U.S.A.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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