BENDIX Gen. 4 ABS ECU Installation Instructions

This kit is intended to provide the necessary components to replace
® ™
a Bendix Gen. 4 ABS ECU (part number 300126) with a Bendix
™
Gen. 5 ABS ECU (part number 801753 or equivalent).
For many vehicles, the ECU replacement requires only
a changeout of the ECU and a reconfi guration step.
For vehicles where the original ECU used the J1922 link
to communicate with the engine retarder control, the
extra steps outlined in the "Retarder Relay Installation"
section will also need to be carried out.
Read and follow all standard safety guidelines, including
those found in the General Maintenance Precautions
section on page 2 of this document.
The replacement controller is a Gen. 5
not support J1922 engine communications, so, as mentioned
above, for installations which use J1922, please also follow
the Section "Retarder Relay Installation." To determine if
the vehicle is using J1922, verify if pins 1 and 3 on the X1
connector are being used, or connect the vehicle to a PC
computer and use the Bendix
look for "Retarder Control" on the ECU Status or Confi guration
screens. Bendix ® ACom ™
download from the bendix website.
KIT CONTENTS
Item . . Description . . . . . . . . . . . Qty.
1 . . . . Replacement ECU . . . . . . . . 1
(not shown). . Bracket . . . . . . . . . . . . . . 1
(not shown). . Bolts . . . . . . . . . . . . . . . 4
(not shown) . Nuts . . . . . . . . . . . . . . . 4
X1
17 Way
Connector
FIGURE 1 - KIT CONTENTS, VIEW OF ECU AND
CONNECTORS
S-1509 ©2008 Bendix Commercial Vehicle Systems LLC 1/08 Printed in U.S.A. All Rights Reserved.
Installation
Instructions
™
ABS ECU, which does
® ™
ACom Diagnostics program to
Diagnostics is available as a free
Reconfi guration
After installation, in all cases, use a diagnostic tool such as the
® ™
Bendix ACom
the Eaton cartridge), or the blink code switch, to verify that the
confi guration of the ABS ECU is correct.
®
Remove the Controller Assembly
1. Locate the Gen 4
2. Note if pins 1 and 3 of X1 are used (indicating retarder
control over J1922 was used). Where they are present,
remove and discard these wires.
3. Release all the connectors to the ECU assembly.
4. Remove the original mounting bolts from the controller.
Retain the bolts for re-installation.
Install Controller Assembly
1. Install the mounting bracket onto the replacement ECU,
using the nuts and bolts supplied in this kit.
2. Position the ECU/bracket assembly at the original location
on the vehicle and attach it using the original mounting
bolts.
Retarder Relay Installation
In cases where the Gen. 4
to control the retarder, the technician will need to hard-wire
a retarder relay for retarder control and remove the J1922
connection. Follow the wiring diagram in Figure 2 throughout
this procedure.
Required materials (not supplied): A 12V, 20/30 Amp,
automotive relay (single pole, double throw), a 5 Amp in-line
fuse, 18-gauge wire and terminals for the connector.
Ignition
Switch
1
17 Way Connector
FIGURE 2 - WIRING DIAGRAM WHERE J1922
COMMUNICATION TO RETARDER IS REQUIRED
Diagnostics program, Nexiq Pro Link (using
™
ECU on the vehicle.
™ ABS ECU used the J1922 link
J1922
1
2
J1922
3
4
5
6
7
7
Power
X1 Pin 7
8
9
10
11
12
13
Retarder
14
15
16
17
17
X1 Pin 17
18
Engine ECM Retarder Pin
5 A
Fuse
-
+
ECU
Relay
1