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ELECTRONIC VACUUM MODULATING (EVM) GOVERNOR SYSTEM TROUBLE SHOOTING PROCEDURE (cont)
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 TROUBLE SHOOTING ELECTRONIC VACUUM MODULATING (EVM) GOVERNOR SYSTEM TROUBLE SHOOTING PROCEDURE The following procedure presents a       J systematic method   of   diagnosing   and   trouble   shooting   the   Electronic Vacuum  Modulating  (EVM)  Governor  System.    Each  trouble shooting   step   has   a   chart   to   locate   the   component   and illustrate  the  test.    Test  instruments  used  consist  of  a  volt- meter and a tachometer. It   is   recommended   that   the   tachometer   used   for testing governor no load speed be an instrument with a high percentage of accuracy.  The governed no load speed should be within a 100 RPM tolerance. If engine speed reading is more than 100 RPM high or  lower  than  the  specified  governed  no  load  speed,  make sure the tachometer being used has been properly calibrated before condemning the ECU or vacuum solenoid valve. Figure 61 Anti Tamper Proof Seal Electrical connections on the EVM system are sealed with  an  anti-tamper  proof  seal  tape  which  is  placed  on  the connectors at the time of assembly.  The production seal tape can  be  identified  by  its  white  color  with  black  print.    If  the connector   seal   tape   is   tampered   with   the   word   VOID   will appear. After   service   is   performed,   a   service   anti-tamper proof  tape  which  is  white  in  color  with  red  print  should  be installed.    This  difference  in  print  color  will  show  the  system has been serviced. 1.    Visually  inspect  condition  of  wiring  connections  and components. 2.    Disconnect   wire   at   electronic   control   unit   (ECU). Check  for  battery  voltage  with  ignition  turned  on.    If battery voltage is not found, refer to Service Manual, ELECTRICAL, for repair.  If battery voltage is found, proceed to Step 3. Figure 62. Step 1 1.  Electronic Control Unit (ECU) 2.  Solenoid Vacuum Valve 3.  Ignition Coil 4.  Cable Connections Figure Figure 63. Step 2 1.  Ignition Switch “ON” 2.  Battery Voltage 3.  Volt Meter 4.  Battery Source to ECU Cable 3.   Disconnect ECU signal cable at terminal connector as shown. a.     Check  continuity  of  cable  from  negative  side of  coil  to  ECU  end.    If  reading  indicates  an open circuit, replace cable. CGES-125-T Page 41 ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1

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