TM   10-3930-643-20 ENGINE,  FUEL,  EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 4 - 2. Engine   STE/ICE   Tests. a. TEST  10  -   ENGINE RPM (S/N 2001 AND ABOVE ONLY). 1. 2. 3. 4. 5. 6. Refer   to   VTM-General   Setup   and   Checkout   Instructions   in   TM   9-4910 571-12&P. Connect   power   cables   to   battery,   as   shown. Remove   cap   from   tachometer   drive. Install   pulse   tachometer,   as   shown. Connect  cable. Perform   test   using   procedure   Test   10   as   instructed   in   TM   9-4910-571-12&P. Engine   rpm   at   low   idle   should   be   between   600-700   rpm.   At   high   idle,   a maximum   of   2750   rpm   should   be   run   on   the   engine.      When   the   governir   has full  load,  2500  rpm  is  normal. Return   vehicle   to   its   normal   condition. 4-6