IK0800139 ­ Remote Engine Speed Control Module (RESCM) Troubleshooting

SB-10054935-3713
Countries:

Page 1 of 3

AUSTRALIA, BRAZIL,
CANADA, UNITED
Document
STATES, MEXICO,
IK0800139
ID:
PUERTO RICO, SOUTH
AFRICA

Availability:
Major
System:
Current
Language:
Other
Languages:

ISIS, FleetISIS

Viewed:

3169

Revision: 6

ELECTRICAL SYSTEM Created:

7/2/2008

English

Last
1/6/2014
Modified:

Français, Español,

Author:

Joe
Christopher

Less Info
Hide Details

Copy Link

Coding Information
Copy Relative
Link

Bookmark

Add to
Favorites

Print

View My
Bookmarks

Provide
Feedback

Helpful

Not Helpful

683

754

Title : Remote Engine Speed Control Module (RESCM) Troubleshooting
Applies To : All trucks with RESCM

DESCRIPTION

The Remote Engine Speed Control Module can be used to perform the same functions as the engine harness
remote engine speed control.
The RESCM communicates on the Bodybuilder 1939 data link. The 7 packs and RPMs communicate the same
way. You can use the same data link troubleshooting for all modules on the Bodybuilder Data Link. There are
basically 3 reasons that you will get communication error codes for these modules.
1. There's a problem in the Bodybuilder Data Link.
2. The module is miising power or ground signals.
3. The address jumper is in the wrong place or missing.

For Installation Instructions, click here.
Follow the procedure below for diagnostics.

POSSIBLE DIAGNOSTIC TROUBLE CODES

SPN

FMI

Description

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 2/3/2014

IK0800139 ­ Remote Engine Speed Control Module (RESCM) Troubleshooting

Byte
7

Byte
8

Page 2 of 3

1231

14

225

1

RPM #1 not communicating with the ESC

1231

14

225

2

More than one RPM responds back as RPM #1

1231

14

226

1

RPM #2 not communicating with the ESC

1231

14

226

2

More than one RPM responds back as RPM #2

1231

14

228

1

RPM #4 not communicating with the ESC

1231

14

228

2

More than one RPM responds back as RPM #4

1231

14

231

1

RPM #7 not communicating with the ESC

1231

14

231

2

More than one RPM responds back as RPM #7

1231

14

34

1

RASM #1 not not communicating with the ESC

1231

14

34

2

More than one RASM responds back as RASM #1

1231

14

234

1

RASM #2 not not communicating with the ESC

1231

14

234

2

More than one RASM responds back as RASM #2

1231

14

209

1

Remote engine speed control module is not communicating with the
ESC

1231

14

209

2

More than one Remote engine speed control module with the same
source address is responding to the ESC

PARTS INFORMATION
Click here for the Bodybuilders Quick Reference
Click here for the Diamond Logic Body Integration Quick Reference Parts Guide (This is a very good parts
guide with pictures)

TROUBLESHOOTING
1. Don't worry about power on pin 1 at the RESCM or pin A at the 4004 of the ESC. This is power for the air
solenoid module and is not used for the RESCM.
2. You should have battery voltage on pin 6 at the RESCM.
3. You should have a good ground on pin 2.
4. Make sure that the address jumper wire is in the right place, also remove connector and check terminals
for being pushed back. For example, the address jumper for RESCM 1 should be between pins 1 and 2
of the J3 (input) connector of the RESCM. The RESCM remote throttle input is preloaded with a resistor
fixed in connector J3, pins 17 and 14. This resistor fixes the input at 0%. If using a remote throttle pedal

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 2/3/2014

IK0800139 ­ Remote Engine Speed Control Module (RESCM) Troubleshooting

Page 3 of 3

of any kind, remove this resistor when installing the remote throttle connections.If not installing a remote
throttle, leave this resistor in place.Do not remove the jumper in J3 pins 1-2, if it is installed.

5. Check voltage from pin 34 to ground and from pin 35 to ground at the 4004 connector of the ESC while
the connector is disconnected from the ESC, we're measuring the voltage coming from the RESCM, with
the key on.
◦ You should have approximately 5v total when you add the voltages from each wire together, on
the body builder data link both circuits will have 2.5v.
◦ If you get 0v or close to it on either wire, you probably have a short to ground on that wire.
6. Check resistance between pins 34 and 35 of the 4004 connector at the ESC with the key off.
◦ You should have approximately 60 ohms
◦ There are two 120 ohm resistors in the data link.
◦ If you get 0 ohms, then you have a short between the 2 wires.
◦ If you get 120 ohms, you have an open somewhere in the data link or you're missing one of the
resistors.
7. Check the resistance from pin 34 to ground and from pin 35 to ground at the 4004 connector of the ESC
connector with the key off.
◦ Resistance should be greater than 1,000 ohms.
◦ If resistance is less than a 1,000 ohms, then you have a short to ground.
8. Measure resistance between pin 34 at the 4004 connector and pin 3 at the RESCM and between pin 35
at the 4004 and pin 4 at the RESCM.
◦ You should have less than 1 ohm resistance. If you have more than that, you either have a bad
connection somewhere or you have an open in that wire.
9. If you still can't find the problem, enter your codes and measurements from the steps above into a Tech
Service case file.

CIRCUIT DIAGRAMS
•

For circuit diagrams, click here.

Hide Details

Feedback Information
Viewed:

3168

Helpful:

683

Not Helpful: 754
No Feedback Found

Copyright © 2014 Navistar, Inc.

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 2/3/2014