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Page Title: NO CHECK ENGINE LIGHT DURING BULB CHECK OR CANNOT CLEAR CODES (Contd)
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TM9-2320-360-20-3 Section 4 TROUBLESHOOTING CHARTS -- D. CHART -4 - NO “CHECK ENGINE” LIGHT DURING BULB CHECK OR CANNOT CLEAR CODES (Cont’d) STEP/SEQUENCE RESULT C4-4 Check  for  Open l Remove  jumper  wire.  With  ignition on,  read  voltage  on  vehicle harness  connector,  socket  B3 (red  lead)  to  a  good  ground (black  lead). C  4-5 Check for Bat t l Turn  ignition  off. l Disconnect  the  5-way  power harness   connector. lRead voltage at the 5-way power harness  connector.  Socket  A  (red lead) to a good ground (black lead). l Repeat  voltage  readings  on  5-way power   harness   connector,   keeping the black lead to a good ground and  the  red  lead  to  socket  C. Less  than 10.0  volts. Greater  than or equal to 10.0 volts. Less  than 10.0 volts on any  reading. Greater  than or  equal  to 10.0 volts on readings. WHAT  TO  DO  NEXT The  ignition  line  (ckt  #439)  is open.  Repair  open.  Then  go to  C4-30. Go to C 4-5. Either one of the 20 Amp, DDEC circuit breakers (CB 20 + 21) is blown and/or the Battery Power line(s) (ckt #240 or #241) has an  open  or  short  to  ground. Check that the battery power (ckt #240 and #241) are not  switched  off  when  the  ignition is  turned  off  (see  note  below). Repair  problem.  Then  go to  C4-30. Go  to  C  4-6. *NOTE: Engine update information may not update if main ECM power (ckt #240 and #241) is switched off with/or  before  ignition. H-67

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