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Diagnostic Port on Electronic Engine and Transmission

Diagnostic Connector

Figure 1.1 - CAT Comm Adapter 3 (to ATA - J1708/ J1587)




Read More:
Test the Connection to the Vehicle using NEXIQ Device Tester (USB-Link™)
Test the Connection to the ECM using CAT Communication Adapter 3 Toolkit


Deutsch Connectors (6/9-Pin)
NOTE: On the Deutsch 9-pin SAE Standard Heavy-Duty Truck Connector, pins H and J are labeled "OEM Specific". Some truck OEMs have used these pins differently (i.e. PACCAR and ISO9141), however the most common use of these pins is for a second CAN channel (i.e. Freightliner Cascadia).

6-Pin Deutsch – Commonly Called the J1708/J1587 Heavy-Duty Truck Connector
Figure 1.2 - J1708/ J1587 on Detroit Engine DDEC IV Series 60
Pin - Value
A - J1708/ J1587 Hi
B - J1708/ J1587 Lo
C - Battery (+)
D - OEM Specific (or Not Used)
E - Battery (-)
F - OEM Specific (or Not Used)

9-Pin Deutsch – SAE Standard Heavy-Duty Truck Connector
Figure 1.3 - Kenworth/ On-Highway Truck (C10/ C13 Engine)
Pin - Value
A - Battery (-)
B - Battery (+)
C - CAN/ J1939 Hi
D - CAN/ J1939 Lo
E - CAN/ J1939 Shield
F - J1708/ J1587 Hi
G - J1708/ J1587 Lo
H - OEM Specific (or Not Used)
J - OEM Specific (or Not Used)

9-Pin Deutsch – Freightliner Cascadia (H-J Used for Dual CAN)
Pin - Value
A - Battery (-)
B - Battery (+)
C - CAN/ J1939 Hi
D - CAN/ J1939 Lo
E - CAN/ J1939 Shield
F - J1708/ J1587 Hi
G - J1708/ J1587 Lo
H - CAN 2 Hi
J - CAN 2 Lo

9-Pin Deutsch – PACCAR (J Used for ISO9141 K-Line)
Pin - Value
A - Battery (-)
B - Battery (+)
C - CAN/ J1939 Hi
D - CAN/ J1939 Lo
E - CAN/ J1939 Shield
F - J1708/ J1587 Hi
G - J1708/ J1587 Lo
H - OEM Specific (or Not Used)
J - ISO9141 K-Line
Figure 1.4 - PACCAR (with C13/ ISX15 Engine)
Figure 1.5 - Adapter: Nexiq USB-Link

9-Pin Deutsch – CNH (Dual CAN and E Used for ISO9141K-Line)
Pin - Value
A - Battery (-)
B - Battery (+)
C - CAN1/ J1939 Hi
D - CAN1/ J1939 Lo
E - ISO9141 K-Line
F - N/C
G - N/C
H - CAN2/ J1939 Hi
J - CAN2/ J1939 Lo

9-Pin Deutsch – ALLISON Transmission/ Cummins Engine
Pin - Value
A - Battery (-)
B - Battery (+)
C - CAN/ J1939 Hi
D - CAN/ J1939 Lo
E - CAN/ J1939 Shield
F - J1708/ J1587 Hi
G - J1708/ J1587 Lo
H - OEM Specific (or Not Used)
J - OEM Specific (or Not Used)

Figure 1.6 - 5th Gen Allison Transmission (4700-OFS)

9-Pin Deutsch – J1939 "Type 2" for J1939 @500k
Pin - Value
A - Battery (-)
B - Battery (+)
C - CAN/ J1939 Hi
D - CAN/ J1939 Lo
E - CAN/ J1939 Shield
F - Protocol "Hi" Line, i.e CAN/ J1708/ J1939 Hi
G - Protocol "Lo" Line, i.e CAN/ J1708/ J1939 Lo
H - OEM Defined (or Not Used)
J - OEM Defined (or Not Used)

9-Pin Deutsch – CAT Industrial Connector – (J1708/J1587, J1939, CAT Data Link)
Pin - Value
A - Battery (+)
B - Battery (-)
C - CAN/ J1939 Shield
D - CAT Data Link (CDL) Hi
E - CAT Data Link (CDL) Lo
F - CAN/ J1939 Lo
G - CAN/ J1939 Hi
H - ATA/ J1587/ J1708 Lo (or Not Used)
J - ATA/ J1587/ J1708 Hi (or Not Used)
Figure 1.7 - CAT Industrial Connector

Read More:
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CAN Bus Failure on Engine Display








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