Wire Resistances; Communications - Sae J1939 Data Link - Detroit Diesel DDEC VI Application And Installation

Wire Resistances

VIH power terminals require 14 AWG wire. The total resistance of the power harness cannot
exceed 60 mΩ. The characteristics for Teflon coated and GXL type wire gauges are listed in
listed in Table 3-74.
SAE Wire Metric
Gauge Gauge #
16 1
14 2
12 3
10 5
8 8
Table 3-74 Wire Characteristics
Total power harness resistance is determined by shorting together the eight terminals in the ECU
connector, and then measuring the resistance from the battery (+) to battery (-) terminal at the
maximum operating temperature (105°C). Disconnect the harness from the batteries before
measuring the resistance.
Communications – SAE J1939 Data Link
SAE J1939 Data Link+, SAE J1939 Data Link-, and SAE J1939 Data Link Shield are used as the
J1939 communication link. J1939 cable is required for the J1939 data link. Termination resistors
are required per the SAE specification. Refer to SAE J1939–11 for specific requirements.
The communication system operation will degenerate if the wrong
cable is used.
The CPC connector pin assignments for SAE J1939 are listed in Table 3-75.
Pin
2/18
2/17
2/16
Table 3-75 J1939 CPC to VIH Connector Pin Assignments
All information subject to change without notice. (Rev. 01/07)
7SA827 0701 Copyright © 2007 DETROIT DIESEL CORPORATION
DDEC VI ELECTRONIC CONTROLS APPLICATION AND INSTALLATION
Area Resistance
mm 2 mΩ/m
1.129 15.300
1.859 9.290
2.929 5.900
4.663 3.720
7.277 2.400
NOTICE:
Signal Type
Data Link
Data Link
Data Link
Resistance Resistance mΩ/ft
mΩ/ft @ 20°C @ 120°C
4.66 6.50
2.83 3.94
1.80 2.50
1.13 1.58
0.73 1.02
Function
SAE J1939 (+)
J1939 Shield
SAE J1939 (-)
Diameter
mm
0.72
1.18
1.86
2.97
4.63
3-63