TM  55-4920-413-13&P g. Engine Oil Temp NO 1 and NO 2. (1) Connect digital voltmeter to connector NO 1 pins G (HI) and H (LOW), using two leads. (2) Set ENGINE OIL TEMP NO 1 CAL/NOR switch to CAL and HI/LO switch to HI. NOTE Measure resistance of test leads and subtact from resistance   indications. (3)  Measure  resistance.  Digital  voltmeter  will  indicate  be- tween 148 and 154 ohms. If not, perform Troubleshooting Ta- ble 4-10. (4) Set ENGINE OIL TEMP NO 1 HI/LO switch to LO. Digital voltmeter will indicate between 71 and 77 ohms. If not, perform Troubleshooting Table 4-10. (5) Set ENGINE OIL TEMP NO 1 CAL/NOR switch to NOR  and  adjust  variable  control  from  fully  CCW  to  fully  CW. Digital voltmeter indication will vary from 77 ohms or less to 148 ohms or more. If not, perform Troubleshooting Table 4-10. (6) Disconnect leads from connector NO 1 pins G (HI) and H (LOW) and connect to connector NO 2 pins G (HI) and H (LOW). (7) Repeat (2) through (5) above, except use ENGINE OIL TEMP NO 2 controls, Table 4-10. Troubleshooting Engine Oil Temp NO 1 or NO 2 (AVIM). NOTE Before  performing  troubleshooting,  remove  DC  simulator  A4  board  and  reconnect  using  extender  board. Trouble I Probable  Cause I Remedv —. No HI-CAL Resistance Eng Oil Temp NO 1 (S20) (21) (R41) Replace  defective  components, Eng Oil Temp NO 2 (S22) (S23) (R38) Figures 4-6,4-7, FO-2, FO-5, or replace  A4  board. HI-CAL Resistance Trim  resistors Use  decade  resistor  box,  and  check Indication  out  of  tolerance NO 1 – (R42) or  replace  defective  component, NO 2 – (R39) Figures 4-6,4-7, FO-2, FO-5 or replace  A4  board. HI-CAL Resistance NO 1 – (R41) (R43) (S20) or (S21) Replace  defective  components, Indication out of tolerance after trim NO 2 – (R33) (R40) (S22) (S23) Figures 4-6,4-7, FO-2, FO-5 or resistors  checked  or  replaced  (R42) replace  A4  board. or (R39) LO-CAL   Resistance NO 1 – (S20) Replace  defective  components, Indication  out  of  tolerance NO 2 – (S22) Figures 4-6,4-7, FO-2, FO-5 or replace  A4  board. NOR-FULLY CCW NO 1 – (R9) Replace  defective  components, Resistance  out  of  tolerance NO 2 – (R1O) Figures 4-6,4-7, FO-2, FO-5 or replace  A4  board. NOR-FULLY CW NO 1 (R9) Resistance  out  of  tolerance Replace  defective  components, NO 2 (R1O) Figures 4-6,4-7, FO-2, FO-5 or replace A4 board. NOTE Not all components listed for circuits above are indicated in Table. Refer to applicable circuits and Troubleshoot us- ing information provided in Table. NOTE Resistance checks are also listed on figure 4-7. 4-15