SYMPTOM RELATED DIAGNOSTICS

BUFFERED RPM (continued)

Test 64

Checking for a loose connection

1.Reconnect the tachometer.

2.Run the engine.

If the tachometer is now working, testing has apparently corrected a loose connection. Recheck all connectors to ensure proper connections.

If the tachometer is still not working, proceed to Test 128.

Test 128

Checking for a defective tachometer or V-MAC II module

1.Replace the tachometer with a known good unit.

2.Run the engine.

If the tachometer is now working, the old tachometer is defective. Replace the old tachometer with a new unit. Retest to be sure the problem has been corrected.

If the tachometer is not working, reinstall the original tachometer and replace the V-MAC II module. Retest to be sure the problem has been corrected.