TM 5-3805-280-24-1
Sub-System Diagnostics
ENGINE CONTROL (EC)
YES: EC motor harness
MOTOR (M2) HARNESS
is OK. Go to next check.
CHECK
NO: Repair open wire.
T118393 UN30NOV98
Disconnect harness from EC motor.
Disconnect 26-pin connector A from engine and pump controller.
Measure continuity from pin 1 in EC motor connector to pin 24 in connector A.
Measure continuity from pin 2 in EC motor connector to pin 25 in connector A.
Measure continuity from pin 3 in EC motor connector to pin 12 in connector A.
9015
15
Measure continuity from pin 4 in EC motor connector to pin 26 in connector A.
74
Does ohmmeter read approximately the same resistance in all 4 measurements?
1/1
YES: EC Sensor is OK.
ENGINE CONTROL (EC)
Go to next check.
SENSOR (B17) CHECK
NO: Sensor has failed.
Replace.
T118392 UN21NOV98
1--Positive Terminal
2--Sense Terminal
3--Negative Terminal
Disconnect harness from EC sensor.
Measure resistance of sensor from connector pin 1 to pin 3, and pin 1 to Pin 2.
Does ohmmeter read 2000 400 ohms from pin 1 to pin 3 and something less than
that from pin 1 to pin 2?
1/1
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