TM 10-3930-675-20-10009 00-2COOLING FAN OPERATION AND FAN CONTROL TROUBLESHOOTING - CONTINUED0009 00Table 1. Error Code 166 - Cooling Fan Speed, Wiring Circuit Failure Troubleshooting Procedures - Continued.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONError Code 166 - Cooling Fan Speed, WiringCircuit Failure - Continuedb. If voltage is not present,check continuity betweenECU (790) connector 2 pin13 and connector X158 pin10, between ECU (790)connector 2 pin 10 andconnector X159 pin 1, andbetween connector X159pin 1 and connector X158pin 9.If continuity is not present,repair or replace connectors (WP0111 00).3. Perform voltage check atconnector block X154 pin 3.a. If 20-25V are present,check continuity betweenconnector X154 pin 3 andECU (790) connector 2 pin9.If continuity is not present,repair or replace connectors (WP0111 00).b. If voltage is not present,check continuity betweenconnector X154 pin 3 andemergency stop switch(250) pin 2.If continuity is not present,repair or replace connectors (WP0111 00).4. Enter “DIAG SERVO11(13)” menu and checkcurrent of FAN OUTPUT.Current should be present.a. If current is not present,replace ECU (790) (WP 007900).b.If current is present, notifySRA.
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