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My OBD200 Won’t Autobaud. How Do I Set a Custom CAN Address

setting the CAN Address for your OBD200

Fleetwatch FMS · OBD200 · Technician Guide
My OBD200 Won’t Autobaud. How Do I Set a Custom CAN Address?
Some vehicles don’t use the standard engine (ECU) address on the OBD-II port, so the OBD200 can’t autobaud. Use an off-the-shelf OBD-II reader to find the addresses the vehicle actually uses. Then enter one as a custom address with the MR-55 and autobaud again.
Use this guide only as a last step. First complete the Updating the OBD200 guide and the matching OBD preset guide (Paratransit or Non-Revenue). If the OBD200 still won’t autobaud after that, continue here.
Known fix: custom ID CB
Fleetwatch engineering has seen several vehicles where the engine uses the custom extended ID CB (18DAF1CB). If the reader lists an ID ending in CB, or you just want to try the most common fix first, set the custom address to CB in Part 2. Then autobaud the unit (Part 3).
To enter CB: ID 3 (= C), ID 2 (= B), then SEND.
Requires MR-55 version 1.19 or later. Older versions don’t have the custom address screens.

What You Need

OBD-II readerAny off-the-shelf OBD-II scan tool. This guide uses a Foxwell NT301, so menu names on other readers may differ.
OBD200The module that’s failing to autobaud.
MR-55Firmware version 1.19 or later, in technician mode.

Before You Start

  • Plug the OBD200 into the vehicle’s OBD-II port, usually under the dash.
  • Start the vehicle with the key and keep it running (or the ignition on) for the whole procedure. Some functions won’t work with the ignition off.
  • Put the MR-55 in tech mode from the Main Menu. You should see **MAIN MENU**. The asterisks mean tech mode is on.
    ID NO YESTemporary: tech mode turns off when the MR-55 is powered off.
    ID YES NOPermanent: tech mode stays on after a power cycle.
Work quickly. The MR-55 stays locked to the OBD200 for only 60–90 seconds after a read. If you take longer moving through the menus, the read may fail or get stuck. If that happens, press RESET and read the module again. Many techs press RESET and re-read before each part of this guide.

Part 1: Find the Vehicle’s Addresses (OBD-II Reader)

1Unplug the OBD200 and connect the OBD-II reader to the same OBD-II port. Make sure the ignition is on.
2When the reader powers up, select OBDII/EOBD and press ENTER.
3The reader tests different CAN settings, then settles on a single Protocol. Write it down. You need to know whether it’s CAN STD (FAST or SLOW) or CAN EXD (extended) for Part 2.
Foxwell Protocol screen showing CAN EXD FAST outlined in red
4If it asks to erase previously stored data, press ENTER.
5From the list of control modules, select Engine and press ENTER. If there’s no Engine module, pick any module listed.
6Scroll down (the down/Erase button) to Modules Present and press ENTER.
7Write down every ID shown. These are the addresses you’ll try in Part 2. Then unplug the reader and plug the OBD200 back in.
Foxwell Modules Present screen listing IDs $18DAF110 and $18DAF11E, outlined in red

In this example, the vehicle uses extended addresses 18DAF110 and 18DAF11E, so you’d try 10 and then 1E.

Part 2: Set the Custom Address (MR-55)

8From the Main Menu (in tech mode), press 1 to read the OBD200. If you’re not at the Main Menu, press CLEAR until you are. When the results show, press CLEAR.
BUS> 0009 / 000123
ODO> 12345.6
EHRS> 7890.1
IHRS> 2345.6

1. RF PARAMETERS
2. SET BUS#
3. INITIAL VALUES
4. GPS SETTINGS
9Press 3 INITIAL VALUES, then 4 MORE.
1. INITIAL ODO
2. ODO SOURCE
3. ENGINE HOURS
4. MORE
10Press 4 CAN/OBD Setup, then 4 More, 4 More, and 4 OBD EID Conf.
1. IDLE HOURS
2. TIRE FACTOR
3. STANDARD CFGS
4. CAN/OBD Setup
1. Odo Src Fltr
2. Para Preset
3. NonRev Preset
4. OBD EID Conf
11The MR-55 shows WAIT... READING, then the current settings for a few seconds. You don’t need to press anything.
CURR EID TYPE>
STANDARD
CURR CUSTOM ID>
18DAF110
12When the options appear, press 3 Custom EID. The screen shows ENTER IDENTIFIER >.
1. STD OBD EID
2. Nissan EID
3. Custom EID
13Enter an address from your Part 1 list that you haven’t tried yet (see the table below), then press SEND. Go to Part 3.
Reader showedAddress typeWhat to enter
CAN EXD (FAST or SLOW)Extended
Standard: 18DAF110
Range: 18DAF100–18DAF1FF		The first six digits never change, so enter only the last two and press SEND.
Example: for 18DAF11E, press 1 ID 5 (= 1E) SEND.
CAN STD FAST or CAN STD SLOWStandard
Standard: 7E8
Range: 7E8–7EF		The OBD200 adds the number you enter to 7E8, so enter the difference and press SEND.
Example: for 7EB (7E8 + 3), press 0 3 SEND.
Entering letters A–F: addresses are hexadecimal. Press ID and buttons 1–6 become A–F. Example for 1B: press 1, then ID, then 2.
Want to go back to the standard address? In step 12, press 1 STD OBD EID instead. The OBD200 goes back to standard addressing. Return to the Main Menu and go to Part 3.

Part 3: Autobaud

14Make sure the ignition is ON. Autobaud always fails with the ignition off.
15Read the OBD200 again: press 1, then CLEAR.
16Press 3 INITIAL VALUES, 4 MORE, 4 CAN/OBD Setup, then 1 Auto baud.
1. Auto baud
2. Bit Rate
3. EID or SID
4. More
17Press SEND and wait for Autobaud success.
Autobaud success
0500 kb/s SID
Press any key
0250 or 0500 kb/sSuccess. Go to Part 4 to confirm.
DisabledThat address didn’t work. Go back to Part 2 and try the next address on your list.

Part 4: Confirm OBD Communication

With the ignition on, read the OBD200 with the MR-55. During the read, watch the green and red lights in the small, rice-sized hole next to the OBD200’s USB-C port.

OBD200 end view with the small status light hole next to the USB-C port outlined in red
Green and red both blinkDone. OBD communication is working.
Only green blinksThe OBD200 isn’t talking to the vehicle yet. Go back to Part 2 and try the next address on your list.
Tried every address and it still won’t autobaud? Contact Fleetwatch Support with the vehicle’s year, make and model and the list of IDs from Part 1.