e14. TACHOMETER DOES NOT OPERATE OR IS INACCURATE
NOTE
If tachometer does not illuminate, perform
Electrical System Troubleshooting e21.
Tachometer Does Not Illuminate prior to
beginning this task.
1.
TEST OPTIONS
REASON FOR QUESTION
YES
NO
CAUTION
Read CAUTION
on following page.
If resistance is greater than
1440 ohms, engine speed
sensor is faulty.
Resistance Test or
STE/ICE-R Test #91
Is less than 1440 ohms
resistance present from
engine speed sensor
connector socket 1 to
pin 2?
KNOWN INFO
Faulty engine speed sensor.
Faulty dashboard cable
assembly.
Faulty auxiliary panel cable
assembly.
Faulty engine control cable
assembly.
Faulty tachometer.
POSSIBLE PROBLEMS
Tachometer illuminates.
VOLTS gage OK.
START
INITIAL SETUP
Equipment Conditions
Engine shut down (TM 9-2320-365-10).
Tools and Special Tools
Tool Kit, Genl Mech (Item 44, Appendix C)
STE/ICE-R (Item 39, Appendix C)
Multimeter, Digital (Item 22, Appendix C)
Wrench, Torque, 0-75 lb-in. (Item 86, Appendix B)
Materials/Parts
Wire, Elect, 50 ft (Item 77, Appendix D)
Personnel Required
(2)
References
TM 9-4910-571-12&P
Replace engine speed sensor
(para 7-38).
TM 9-2320-365-20-1
2-348 Change 1
