REV1297NB R
TU1.P65
Page 4
Wiring for the RTU 1 system is very simple. Refer to fig 1 below. All extension cables are
supplied with unique connectors that simplify the interconnections. See fig 2 for cables.
1) Use the extension cable supplied, provide 12VDC and ground to the electronic
module on the wire labeled POWER on the back of the module. Leave the white wire
disconnected until step 3.
2) Connect the cable for the J1922 data link. The J1922 datalink is a data wire consisting
of two wires leading from connector A of the ECM. On more recent Cummins ECMs
(), pin 5 on connector A of the ECM is the positive (+) (wire #020) and should
be connected to the RTU's red DATA J1922 wire. Pin 23 is the negative (-) (wire #021)
and should be connected to the RTU's black DATA J1922 wire. The cable used is a
shielded twisted pair cable.
If you have an older Cummins CELECT engine, there may be a 2 pin Packard connector
for the J1922 data link located near the CELECT ECM by the bulkhead. Check that the
positive (+) wire comes from pin 10 on the A connector. The negative (-) comes from pin
20 on the A connector.)
3) The RTU will not be active until you provide 12V to the white wire. This connection
should be wired through the pump engaged interlock and the parking brake for safety. In
this manner, the RTU will not receive an "active" signal until these conditions are met.
4) If HIGH IDLE option was
ordered, refer to Figure 7 for
wiring instructions.
ELECTRICAL INSTALLATION
NOTE:
HIGH
IDLE
CONTROL MODULE
RTU 1
2
1
1
2
3
3
Power cable
High Idle cable
J1922 data link cable
Refer to Figure 7
CELECT
ECM
RED = 12 VDC
BLACK = GND
WHITE = Interlock.
12VDC signal required
FIG 1.
