Pinpoint Test I: The Tachometer Is Inoperative

I1 RETRIEVE THE RECORDED DTCs FROM BOTH CONTINUOUS AND ON-DEMAND PCM SELF-TESTS
- Check the recorded PCM DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
1. YES : REFER to the Introduction - Gasoline Engines article.
2. NO : Go to I2.
I2 CARRY OUT THE TACHOMETER ACTIVE COMMAND USING THE SCAN TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) DataLogger
- Select the instrument cluster (IC) tachometer (TACH_IND) active command. Command the tachometer in 10% increments while monitoring the tachometer.
- Does the tachometer begin at 0 RPM, increase to 7,000 RPM then return to 0 RPM?
1. YES : Go to I3.
2. NO : Go to I4.
I3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS
- Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
1. YES : For DTC U0100, go to Pinpoint Test AD .
  For all other DTCs, REFER to the DTC Tables .
2. NO : Go to I4.
I4 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION
- Disconnect the instrument cluster (IC) connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the instrument cluster (IC) connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.