SCHEMATICS AND DIAGRAMS
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SCHEMATICS AND DIAGRAMS
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SCHEMATICS AND DIAGRAMS
SYSTEM CONNECTORS
The V-MAC£ III system utilizes many different
connector styles and sizes. The Vehicle
Electronic Control Unit (VECU), Engine
Electronic Control Unit (EECU), and the Serial
Communications Port connectors are the largest
connectors in the system, and are where the
majority of the V-MAC£ III system testing is
performed. This section illustrates the VECU,
EECU, and Serial Communications Port
connectors and includes charts with connector
terminal identification and functions. The charts
should not be used as a replacement for the
detailed tests that appear in this manual. The
charts are intended as an identification reference
for use when repairing a connector or terminal.
6-Pin Serial Communication Port
The Serial Communications Port is a six (6) pin
connector used for system diagnostics and
reprogramming. It is located under the dashboard
to the left of the steering column. This port is used
for connecting a diagnostic computer to the
vehicle. See the illustration for the pin locations. A
listing of the signal on each pin follows the
illustration.
858
Figure 858 — 6-Pin Serial Communication Port
9-Pin Serial Communication Port
The Serial Communications Port is a nine (9) pin
connector used for system diagnostics and
reprogramming. It is located under the dashboard
to the left of the steering column. This port is
used for connecting a diagnostic computer to the
vehicle. See the illustration for the pin locations. A
listing of the signal on each pin follows the
illustration.
859
Figure 859 — 9-Pin Serial Communication Port
PIN Letter Designation
A Serial data link PLUS (+) line
B Serial data link MINUS (−) line
C PLUS (+) 12 volts
D Accessory relay
E Chassis ground
F Not used
PIN Letter Designation
A Chassis ground
B PLUS (+) 12 volts
C J1939 Serial data link PLUS (+) line
D J1939 Serial data link MINUS (−) line
E J1939 Serial data link shield line
F J1587 Serial data link PLUS (+) line
G J1587 Serial data link MINUS (−) line
H Not used
J Not used
SCHEMATICS AND DIAGRAMS
Page 719
Vehicle Electronic Control Unit
(VECU) Connectors
The Vehicle Electronic Control Unit (VECU) has
three 18 pin connectors. Each pin is marked on
the inside of the connector. To disconnect a
connector from the VECU, press down on the
tang of the harness connector and gently pull the
connector from the VECU. Be sure that the
connector is aligned as shown below to avoid
confusion when checking pin numbers. The
connector number and color are shown as a
reference for reconnecting the VECU to the cab
harness.
860
Figure 860 — VECU Connectors
VEHICLE ELECTRONIC CONTROL UNIT
(VECU) CONNECTOR PIN DESIGNATIONS
VECU Connector J1
PIN
Number Description
1 Ignition key switch
2 Starter signal
3 Buffered vehicle speed output
(Speedometer Signal)
4 Buffered RPM output (Tachometer Signal)
5 Shutdown override signal
6 Speed control ON/OFF switch signal
7 Speed control SET/DECEL signal
8 Speed control RESUME/ACCEL signal
9 Clutch engaged signal
10 Parking brake signal (#1)
11 Service brake signal
12 Engine brake switch — low
13 Engine brake switch — high
14 Not used
15 Fan clutch override
16 Not used
17 Not used
18 Fuel level sensor signal
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SCHEMATICS AND DIAGRAMS
Engine Electronic Control Unit
(EECU) Connectors (ASET™ IEGR
Engine)
The Engine Electronic Control Unit (EECU) has
two 43 pin connectors. To disconnect a connector
from the EECU, pull back on the connector lock
and gently pull the connector back on its heel and
away from the EECU. For easy reference, the
following illustration shows each pin number as it
appears on the connector. Be sure that the
connector is aligned as shown below to avoid
confusion when checking pin numbers. The
connector number and EECU orientation are
shown as a reference for reconnecting the EECU
to the engine harness.
861
Figure 861 — EECU Connectors (ASET™ IEGR Engine)
VECU Connector J2
PIN
Number Description
1 VECU Reference ground
2 Transmission oil temperature signal
3 Front drive axle temperature signal
4 Rear drive axle temperature signal
5 Not used (spare relay)
6 Not used
7 Exhaust temperature sensor signal
8 Exhaust temperature sensor return
9 PTO 1 selected
10 PTO 2 (when selected)
11 Vehicle speed sensor PLUS (+)
12 Vehicle speed sensor MINUS (−)
13 Parking brake signal (#2)
14 Not used
15 Not used
16 Not used
17 CAN-T1
18 CAN-T2
VECU Connector J3
PIN
Number Description
1 J1939 data link high
2 J1939 data link low
3 Not used
4 Throttle position sensor voltage reference
5 Throttle position sensor signal
6 Throttle position sensor return
7 Spare relay #3
8 Shutdown lamp (mechanical gauge panel)
9 Electronic Malfunction Lamp (EML) signal
(mechanical gauge panel)
10 Spare relay #2
11 Not used (spare driver alarm)
12 Spare relay #1
13 Accessory relay control
14 J1587 serial data link A PLUS (+)
15 J1587 serial data link B MINUS (−)
16 PLUS (+) 12 volts from battery
17 PLUS (+) 12 volts from accessory relay
18 Chassis ground
SCHEMATICS AND DIAGRAMS
Page 721
ENGINE ELECTRONIC CONTROL UNIT
(EECU) CONNECTOR PIN DESIGNATIONS
(ASET™ IEGR ENGINE)
EECU Connector J1
PIN
Number Description
1 Not used (Engine oil level sensor)
2 Not used
3 Not used
4 Not used
5 Engine oil temperature sensor signal
6 Not used
7 Air conditioning pressure switch
8 Wastegate solenoid control/Parallel fan
circuit
9 Fan clutch solenoid control
10 Electronic unit pump injector #1
11 Electronic unit pump injector #5
12 Electronic unit pump injector #6
13 Not used (Engine oil level sensor)
14 Not used
15 Boost air pressure sensor signal
16 Not used
17 Coolant temperature sensor signal
18 Engine position sensor return
19 Engine position sensor signal
20 Engine brake #2 control
21 Engine brake #1 control
22 Electronic unit pump injector #2
23 Electronic unit pump injector #3
24 Electronic unit pump injector #4
25 Oil pressure sensor return
26 Temperature sensor common return
27 Intake air temperature sensor signal
28 Fuel temperature sensor signal
29 Not used
30 RPM/TDC sensor signal
31 RPM/TDC sensor return
32 Oil pressure sensor voltage reference
33 Not used
34 Engine oil pressure sensor signal
35 Boost air pressure sensor return
36 Boost air pressure sensor voltage
reference
37 Not used
38 Not used
39 Not used
40 Not used
41 Rear bank electronic unit pump injector
solenoid voltage supply
42 Front bank electronic unit pump injector
solenoid voltage supply
43 Not used
EECU Connector J1
PIN
Number Description
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SCHEMATICS AND DIAGRAMS
EECU Connector J2
PIN
Number Description
1 Not used
2 Not used
3 Engine coolant level sensor signal
4 Not used
5 Not used
6 Not used
7 Not used
8 J1939 data link high
9 Not used
10 12 volts from power relay
11 Not used
12 Chassis ground
13 Not used
14 Not used
15 Not used
16 Not used
17 Not used
18 Not used
19 Not used
20 Not used
21 Not used
22 12 volts from power relay
23 Not used
24 Chassis ground
25 Not used
26 Engine coolant level sensor return
27 Ambient air temperature sensor return
28 Not used
29 Ambient air temperature sensor signal
30 Not used
31 J1587 serial data link (+)
32 Not used
33 Not used
34 Not used
35 Not used
36 Not used
37 Not used
38 J1587 serial data link (−)
39 J1939 data link low
40 Not used
41 12 volts from power relay
42 Not used
43 Chassis ground
EECU Connector J2
PIN
Number Description
SCHEMATICS AND DIAGRAMS
Page 723
Engine Electronic Control Unit
(EECU) Connectors (ASET™ CEGR
Engine)
The Engine Electronic Control Unit (EECU) has
three connectors, J1 is a 36 pin connector, J2 is
an 89 pin connector, and J3 is a 16 pin connector.
To disconnect a connector from the EECU, pull
back on the connector lock and gently pull the
connector back on its heel and away from the
EECU. For easy reference, the following
illustration shows each pin number as it appears
on the connector. Be sure that the connector is
aligned as shown below to avoid confusion when
checking pin numbers. The connector number
and EECU orientation are shown as a reference
for reconnecting the EECU to the engine
harness.
862
Figure 862 — EECU Connectors (ASET™ CEGR Engine)
ENGINE ELECTRONIC CONTROL UNIT
(EECU) CONNECTOR PIN DESIGNATIONS
(ASET™ CEGR ENGINE)
EECU Connector J1
PIN
Number Description
1 Not used
2 12 volts (Battery power)
3 12 volts (Battery power)
4 Chassis ground
5 12 volts (Battery power)
6 Not used
7 Chassis ground
8 Chassis ground
9 Not used
10 ISO K-line
11 Coolant level sensor return
12 Coolant level sensor signal
13 Not used (coolant level warning signal)
14 Fan speed sensor signal return
15 Fan speed sensor supply voltage
16 Not used
17 J1587 serial data link (+)
18 J1587 serial data link (−)
19 Not used
20 Fan speed sensor signal
21 Not used
22 High side bank 1
23 CAN2 J1939 data link high
24 CAN2 J1939 data link low
25 Not used
26 Not used
27 Not used
28 Fan clutch output
29 Not used
30 CAN1 J1939 data link low
31 CAN1 J1939 data link high
32 Not used
33 Not used
34 Not used
35 Air conditioning high pressure switch
36 Not used
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SCHEMATICS AND DIAGRAMS
EECU Connector J2
PIN
Number Description
1 Not used
2 Not used
3 Not used
4 Not used
5 Not used (spare control output)
6 Variable geometry turbo output
7 High side bank 1
8 Not used
9 Not used (spare control)
10 Aux. cooling low
11 Not used
12 High side bank 2 (aux cooler low)
13 Not used
14 Not used
15 Not used
16 Variable EGR control signal (hi)
17 Variable EGR control signal (low)
18 Not used (ground pass thorough)
19 Not used
20 Not used
21 Not used (oil level sensor signal)
22 Not used (oil level sensor ground)
23 Not used
24 Not used
25 Oil pressure sensor supply voltage
26 Variable geometry turbo position sensor
supply voltage
27 Not used
28 Oil pressure sensor ground
29 EGR pressure sensor ground
30 Air humidity sensor +5 volt reference
voltage
31 Not used
32 Not used
33 Not used
34 Wake-up input
35 Boost air pressure sensor supply voltage
36 Not used
37 Not used
38 Not used
39 Not used
40 Not used
41 Not used
42 Not used
43 Not used
44 Not used
45 Oil pressure sensor signal
46 Not used
47 Humidity sensor signal
48 Not used
49 Boost air pressure sensor ground
50 Boost air pressure sensor signal
51 Variable geometry turbo position sensor
signal
52 Not used
53 Not used
54 Turbo wheel speed sensor signal (+)
55 Engine speed sensor (−)
56 Engine speed sensor (+)
57 Not used
58 Not used
59 Not used
60 Not used
61 Inlet manifold air temperature sensor
ground
62 Not used
63 Not used
64 Oil temperature sensor signal
65 Combustion air temperature sensor signal
66
67 Compressor temperature sensor and
Aftercooler outlet temperature sensor
grounds
EECU Connector J2
PIN
Number Description
SCHEMATICS AND DIAGRAMS
Page 725
68 Ambient air temperature sensor signal
69 Variable geometry turbo position sensor
ground
70 Not used
71 Not used
72 Turbo wheel speed sensor signal (−)
73 Turbo wheel speed sensor shield
74 Not used
75 Engine position sensor signal (+)
76 Engine position sensor signal (−)
77 Not used
78 Not used
79 Not used
80 Inlet manifold temperature sensor signal
81 Fuel temperature sensor signal
82 Oil and fuel temperature sensor grounds
83 Humidity sensor ground
84 Aftercooler outlet temperature sensor
ground
85 Compressor discharge temperature sensor
signal
86 Coolant temperature sensor signal
87 Coolant temperature sensor and ambient
air temperature sensor grounds
88 Not used
89 Not used
EECU Connector J2
PIN
Number Description
EECU Connector J3
PIN
Number Description
1 Not used
2 Not used
3 Electronic unit pump injector #6 solenoid
voltage supply
4 Electronic unit pump injector #5 solenoid
voltage supply
5 Electronic unit pump injector #3 solenoid
voltage supply
6 Electronic unit pump injector #3 solenoid
control
7 Engine brake #1 control
8 Engine brake #2 control
9 Electronic unit pump injector #1 solenoid
voltage supply
10 Electronic unit pump injector #2 solenoid
voltage supply
11 Electronic unit pump injector #4 solenoid
voltage supply
12 Electronic unit pump injector #5 solenoid
control
13 Electronic unit pump injector #1 solenoid
control
14 Electronic unit pump injector #4 solenoid
control
15 Electronic unit pump injector #2 solenoid
control
16 Electronic unit pump injector #6 solenoid
control
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