Pinpoint Test K: The Tachometer Is Inoperative

K1 CARRY OUT THE TACHOMETER ACTIVE COMMAND USING THE DIAGNOSTIC TOOL 

• Key in OFF position.
• Connect the diagnostic tool.
• Key in ON position.
• Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
• Select the instrument cluster tachometer active command. Trigger the tachometer and scroll in increments of 10%. Monitor the tachometer gauge. The tachometer should increase in increments of approximately 700 RPM for each 10% change.
• Does the tachometer gauge increase within specifications? 

Yes 

REFER to the INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article to continue diagnosis.

No 

GO to K2.

K2 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 

• Disconnect all instrument cluster connectors.
• Check for:
  • Corrosion
  • Pushed-out pins
• Connect all instrument cluster connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present? 

Yes 

INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.

No 

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.