DRESSTA TD-25M EXTRA, Service Manual

Page: 469 / 595

POWER
SECTION 12
Page 7
DRESSTA TD-25M EXTRA
1. Measure the resistances of potentiometer circuit (3, Fig. 12.4), 50 pin connector (1) is as follows
(refer to wiring diagram):
-
from pin No. 48 to pin No. 47 - 2000 to 3000 [ Ω ]
-
from the supply and the signal:
-
from pin No. 47 to pin No. 49 control lever position - low RPM 1500 to 3000 [ Ω ]
-
from pin No. 47 to pin No. 49 control lever position - high RPM 250 to 1500 [ Ω ]
-
from pin No. 47 to engine block ground – more than 100K [ Ω ]
-
from pin No. 48 and 49 to all pins of 50 and 31-pins connectors – more than 100K [ Ω ]
Fig. 12.4. Engine Control Interface Connectors
1. 50 Pin Connector (view of harness connector)
2. 31 Pin Connector
3. Potentiometer Circuit
4. TC Oil Temperature Sensor 5. Pin No 48 + 5VDC Supply
6. Pin No 49 Signal
7. Pin No 47 Return
After checking has been performed, machine must be checked out in actual operation for proper
functioning.
NOTE: If potentiometer is changed or after calibration downloaded move the control lever
(1, Fig. 12.3) (key switch ON) thought its complete travel 3 times. This procedure calibrates the
new potentiometer with the ECM.
NOTE: If designated engine speeds are not achieved contact with Authorized Cummins Service.