Description

Roadranger AC-AS1, ASC-ASX, ASW, CEM1, FM2 2004 Troubleshooting Manual

If you are chasing a code on a Roadranger AC-AS1, ASC-ASX, ASW, CEM1, FM2 2004 Troubleshooting Manual transmission or ABS system and the aftermarket chart shows something that does not match your display, you already know the pain. I have been there – scrolling through a generic PDF that says “refer to dealer” or gives a description that fits three different failures. That is a waste of a diag bay. This 48-page OEM fault code chart from Roadranger (published February 2004) cuts through the guesswork. It uses the MID, PID/SID, and FMI structure that the J1587 data link actually spits out. No interpretation. Just the OEM fault description and the code number on page 44 for diagnostic connector pinouts.

How To Use This Manual – MID and PID/SID System

The first section explains the lookup process. You read your tool display: a three-digit MID (Module Identifier) followed by PID/SID (Parameter/Subsystem Identifier) and FMI (Failure Mode Indicator). This manual organizes charts by MID – starting with MID 128 for engines (CAT, Cummins, Detroit Diesel, International, Mack), then MID 130 for transmissions (Eaton AC-AS1, AS2-ASX, ASW, CEEMAT, CEMT, DM2, Lightning, Meritor FreedomLin, Meritor SureShift), followed by MID 136 and 137 for tractor and trailer ABS (Bendix, Eaton, Wabco, Haldex), MID 142/158 for Mack engines, and MID 219 for Eaton VORAD. Each chart lists the fault code number, the exact description, and sometimes a severity note. If you have a code 27 from MID 128 CAT, page 4 tells you it is “Coolant Temp Sensor Open Circuit.” That saves you from swapping a thermostat for no reason.

MID 130 – Eaton Transmissions: AC-AS1, AS2-ASX, ASW, CEEMAT, CEMT, DM2, Lightning

This is where most of the transmission codes live. The manual covers the Eaton AC-AS1 (page 17), AS2-ASX (page 18), ASW (page 19), CEEMAT (page 20), CEMT (page 21), DM2 (page 22), Lightning (page 23), plus the Meritor FreedomLin and SureShift (pages 24-25). Each chart uses the same PID/SID/FMI format. For example, if you see MID 130, PID 110, FMI 3 on a AC-AS1, you flip to page 17 and read “Coolant Temp Sensor Open Circuit.” No cross-referencing three different documents. Roadranger put all their automated transmissions in one chart. That matters when you have a CEM1 or FM2 in a fleet – same MID, different model suffixes, but the codes are standardized.

ABS Diagnostics – MID 136 & 137: Tractor and Trailer Systems

ABS codes can be a pain because aftermarket lists mix up tractor and trailer MIDs. This manual separates them. MID 136 covers tractor ABS: Bendix (page 26), Eaton (page 29), Wabco Pneumatic (page 32), and Wabco Hydraulic (page 34). MID 137 covers trailer ABS: Bendix (page 35), Eaton (page 37), Haldex (page 39), Wabco (page 41). If you get a fault on a Wabco hydraulic tractor ABS, page 34 has the exact chart. No guessing whether the code applies to a trailer valve. The manual also includes the Eaton VORAD collision warning system under MID 219 (page 43) – useful if you are working on a truck with radar-based cruise.

Troubleshooting Engines – MID 128: CAT, Cummins, Detroit Diesel, International, Mack

Engine codes from the major builders are all in one section. MID 128 starts with CAT on page 4 – lists cylinder faults (PID 1-6, FMI 11, fault code 72-74), timing sensor calibration issues (PID 22, FMI 13, code 42), PTO throttle signals (PID 30, FMI 8, code 29), and supply voltage faults (PID 41, FMI 3 or 4, code 21). Cummins, Detroit Diesel, International, and Mack follow. If you are working on a truck with a Cummins ISX and the dash shows MID 128 with a code 38, page 3 tells you it is “Intake Manifold Air Temperature Sensor Short Circuit.” That kind of precision cuts diagnostic time in half.

Diagnostic Connectors and Tool Requirements

Page 44 shows the diagnostic connector pinouts – both the 6-pin and 9-pin Deutsch connectors common on heavy trucks. You need a J1587 or J1939 tool to read the MIDs and FMIs. This manual does not teach you how to use a multimeter; it assumes you already know that. What it gives you is the factory lookup table so you can go from display to repair in one step. No calling the dealer hotline. No flipping through three different websites. The chart on page 44 also lists the power and ground pins so you can verify tool connection before blaming the ECU.

3 Reasons to Choose OEM Documentation Over Aftermarket Compilations

Aftermarket fault code lists often merge codes from different years or omit the exact FMI combination. I have seen a generic chart list FMI 3 as “voltage above normal” when the OEM spec says FMI 3 means “voltage below normal” for that specific PID. That sends you down the wrong wire. This manual is an original Roadranger publication from 2004 – it matches the factory firmware of the Eaton AC-AS1, ASC-ASX, ASW, CEM1, and FM2 transmissions built that year. The ABS codes from Bendix, Eaton, Haldex, and Wabco are also from the original OEM release. If you need a manual that matches what the ECU actually outputs, this is it.

Does this manual cover the Eaton AC-AS1 transmission?

Yes, page 17 lists fault codes for the AC-AS1.

Can I use this manual with a J1587 tool?

Yes, the MID/PID/SID format comes straight from the J1587 data link. The manual includes a diagnostic connector diagram on page 44.

Does it include ABS fault codes for Bendix tractor ABS?

Yes, MID 136 Bendix Tractor ABS is on page 26. It also includes Bendix Trailer ABS (MID 137, page 35), Eaton, Wabco Pneumatic and Hydraulic, and Haldex trailer ABS. That is ten ABS charts total, covering both tractor and trailer systems from major manufacturers. If you work on a fleet with mixed trailers, this manual saves you from printing four separate PDFs.

What year and models are covered?

2004 model year for the Roadranger AC-AS1, ASC-ASX, ASW, CEM1, FM2, plus CEEMAT, CEMT, DM2, Lightning, Meritor FreedomLin, SureShift, and ABS from Bendix, Eaton, Wabco, Haldex. Also includes MID 128 engine codes for CAT, Cummins, Detroit Diesel, International, and Mack.

When you need to clear a fault code on a truck with a Roadranger transmission or ABS, you want the chart the factory used. This 48-page manual puts the OEM data in your hand without the fluff. No ads, no notes from a third-party editor. Just the tables. If you do heavy-duty truck repair, Roadranger RTLO-14918B 2011 Parts Catalog – OEM Factory Document is a good companion for parts lookup, and Roadranger RTLO-18918B-T2 2011 Parts Catalog – OEM Truck Parts Manual covers another common model. For transmission theory, Manual Transmission on Wikipedia explains the basics, and Manual Transmission also applies to heavy-duty units. Roadranger RTLO-14613B 2011 Parts Catalog – OEM Factory Document fills out the RTLO series. Access the Factory Manual and keep it in your tool box.