STEP/SEQUENCE RESULT WHAT TO DO NEXT TM 9-2320-363-20-1 Section 4 TROUBLESHOOTING CHARTS D.  CHART 4 · NO "CHECK ENGINE" LIGHT DURING BULB CHECK OR CANNOT CLEAR CODES (Cont'd) C 4-6 Check for Open Move black lead of voltmeter to Less than Ground line(s) (ckt #150 or 151) socket D (of the 5-way power *10.0 volts on has an open.  Repair open. connector). any reading. Then go to C4-30. Read voltage using red lead at sockets A and C of the 5-way power harness connector. Greater than Go to C4-7. Move black lead of voltmeter to or equal to socket E of the 5-way power *10.0 volts on harness connector. all readings. Again read voltage at sockets A, and C of the 5-way power harness connector. Move black lead to socket B of 5-way.  Check voltage at A and C. C 4-7 Check ECM Connectors Check terminals at vehicle Terminals Reprogram ECM.  Then go harness (especially B3 and B1) and connectors to C4-30. and all the terminals in the 5-way are okay. power harness connectors (both the ECM and harness side) for Problem found Repair terminals/connectors. damage; bent, corroded and Then go to C4-30. unseated pins or sockets. C 4-30 Verify Repairs Turn ignition off. "Check Engine" Repairs are complete. Reconnect all connectors. light comes Turn ignition on. on for up to Clear codes. 5 seconds, Turn ignition off. then goes out. Turn ignition on while at the same time observing the "Check "Check Engine" All system diagnostics are Engine" light. Light does complete.  Please review this not come on at all. section from the first step to find the error. "Check Engine" Light Go to START-1, pg 3-345.41. comes on and stays on. *NOTE: Historical codes will not clear and engine hours/fuel comsumption values will not update if main ECM power (circuits #240 and #241) Is switched off with Ignition. *20 volts for 24 volt system. Change 3  3-345.89