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Component Testing: Tachometer

NOTE: DO NOT  allow engine speed to exceed allowable range, engine could be damaged.
  1. Disconnect negative battery cable. Open driver's door. Remove 15-amp ENGINE fuse located in joint box, behind left side of instrument panel. Wait 30 seconds after disconnecting negative battery, and then reconnect negative battery cable.
  2. Perform the following within 30 seconds after completing step 1). Turn ignition on. Press door switch 3 times. Press odometer/tripmeter switch 3 times.
    NOTE: Service codes are set in numerical order only. If a different service code is set in error, return to step 1) and reset instrument cluster input/output check mode.
  3. Reinstall 15-amp ENGINE fuse. Press odometer/tripmeter switch, and then set service code 13. Observe tachometer 2 seconds after service code 13 is set. If tachometer needle moves full scale and indicates 3000 RPM, tachometer is okay. If tachometer needle does not move full scale and indicate 3000 RPM, replace speedometer (tachometer is integrated with speedometer).
  4. To cancel instrument cluster input/output check mode, turn ignition to LOCK position, and then back to ON position, or leave speedometer in check mode for 45 minutes.
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