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Tachometer Inoperative Test

  1. If diagnostic system check has been performed, go to next step. If diagnostic system check has not been performed, perform INSTRUMENT CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Start engine. If tachometer does not indicate correct engine RPM, go to next step. If tachometer indicates correct engine RPM, problem may be intermittent. Try to recreate fault by wiggling wiring and connectors. Check for faulty connections at all connectors that may be causing intermittent condition. See WIRING DIAGRAMS  .
  3. Using scan tool, perform tachometer sweep test. If tachometer does not change from low RPMs to high RPMs, then return to low RPMs, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If tachometer changes from low RPMs to high RPMs, then return to low RPMs, perform on-board diagnostic system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS aarticle in ENGINE PERFORMANCE.
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