Diagnostic Procedure

2003 Nissan-Datsun Frontier Base, StandardSECTION Diagnostic Procedure
  1. Turn ignition off. Disconnect ECM and instrument cluster harness connectors. See Figure or Figure . Check continuity of Green/Black wire between instrument cluster harness connector terminal No. 2 and ECM harness connector terminal No. 29. See Figure and Fig 1 . Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
  2. Check speedometer operation. If speedometer operates properly, go to next step. If speedometer does not operate properly, check VSS and circuits between VSS and instrument cluster. Repair as necessary.
  3. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Identifying Instrument Cluster Harness Connectors & Terminals
G00156667Courtesy of NISSAN MOTOR CO., U.S.A.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.