8206noco.fm Page 200 Thursday, July 2, 1998 1:19 PM
SYMPTOM RELATED DIAGNOSTICS BUFFERED RPM (continued) Test 64
Test 128
Checking for a loose connection
Checking for a defective tachometer or V-MAC II module
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.
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.
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