BENDIX TCH-013-022 プリント
Technical
Bulletin
Bulletin No: TCH-013-022
Effective Date: 11/2/2012 Cancels: N/A
Page: 1 of 2
Subject:
Modifications for J1922 Engine Communications When Using non-J1922
Bendix
Bendix
®
EC-30
™
Electronic Controller Unit (ECU) Replacements
FIGURE 1 - BENDIX
®
EC-30
™
ANTILOCK ECU
Service replacement Bendix
®
EC-30
™
service ECUs no
longer support J1922 engine communications. If the
original ECU on the vehicle used the J1922 engine link
to control the retarder and/or engine traction control, this
Bulletin covers the necessary procedures to enable the
continued support of these functions.
original ECU on the vehicle used the J1922 engine link
to control the retarder and/or engine traction control, this
Bulletin covers the necessary procedures to enable the
continued support of these functions.
Before beginning service work, ask the engine OEM
if the engine Electronic Control Module (ECM) can be
upgraded to support J1939 engine communications. For
vehicles where this option is available, follow the J1939
Upgrade Procedure, otherwise follow the Hard-Wire
Procedure.
Note: The J1939 upgrade procedure provides J1939
if the engine Electronic Control Module (ECM) can be
upgraded to support J1939 engine communications. For
vehicles where this option is available, follow the J1939
Upgrade Procedure, otherwise follow the Hard-Wire
Procedure.
Note: The J1939 upgrade procedure provides J1939
retarder control and ATC engine and brake control,
while the hard-wire procedure only provides retarder
control.
In all cases follow the General Safety Guidelines
shown on page two.
shown on page two.
J1939 UPGRADE PROCEDURE
1. Add two 18-gauge twisted pair wires to the harness
30-pin connector to pin C3 (J1939 H) and pin D3
(J1939 L). C3 and D3 connect to the J1939 bus.
Consult the vehicle OEM for assistance in connecting
to the J1939 bus.
(J1939 L). C3 and D3 connect to the J1939 bus.
Consult the vehicle OEM for assistance in connecting
to the J1939 bus.
2. Make the connections to the vehicle per the wiring
diagram - See Figure 2.
C3
D3
1
2
3
K J H G F
E D C B A
For J1939 engine
communications, add
wires C3 and D3
FIGURE 2 - WIRING DIAGRAM FOR J1939 CONNECTION
3. Reconfigure the ECU by using a diagnostic tool or
diagnostic software.
4. The ECU needs to be configured for ABS and
Automatic Traction Control (ATC) and retarder control
via J1939. Verify the proper configuration using the
LEDs on the ECU, or by using a diagnostic tool.
via J1939. Verify the proper configuration using the
LEDs on the ECU, or by using a diagnostic tool.
Note: The J1939 upgrade procedure provides J1939
retarder control and ATC engine and brake control.
HARD-WIRE PROCEDURE
NOTE: If the engine ECM can not be upgraded
to support J1939 communications, the automatic
traction control function — including both the brake
and engine-limiting functions — will need to be
disabled. The retarder control will now be hard-wired.
A good-quality automotive relay will be required to
complete this procedure and connect the ECU to the
retarder.
A good-quality automotive relay will be required to
complete this procedure and connect the ECU to the
retarder.
Step One: Disable Automatic Traction
Control for Both the Engine and Brake
1. Gain access to the 18-pin harness connector.
1. Gain access to the 18-pin harness connector.
Remove the wires that were connected to the D2
and D3 pins.
and D3 pins.
D2
D3
1
2
3
2
3
F E D
C B A
Traction Modulator
Source
Traction
Modulator Sink/
Common
FIGURE 3 - 18-PIN CONNECTOR
REPLACEMENT ECUs HAVE A LABEL:
ECU DOES NOT SUPPORT IN-CAB TRAILER ABS WARNING
LAMP (PLC) OR J1922 ENGINE COMMUNICATIONS