Description

Eaton Fuller AutoShift Gen II 2000 Diagnostics Manual – 20 Pages of Factory Procedures

I’ve seen more than one shop burn a full Saturday chasing an intermittent no-shift on an AutoShift Gen II because they were working off a generic aftermarket CD. That CD had the wrong pinout for the shift control module, and a guy ended up backprobing the wrong wire with a test light. That’s how you blow a $1,200 ECU. The Eaton Fuller AutoShift Gen II 2000 Diagnostics Manual is what you put on the bench when you need the actual OEM procedure – the one the engineers wrote, not some third-party rewrite. 20 pages. That’s it. No wasted paper.

Diagnostics Procedure: The Flowchart You Need

Page 3 of this manual lays out the core diagnostic flowchart. Key on, service lamp check, active vs. inactive codes, then symptom-based branch points. If the service lamp never comes on, it tells you to verify OEM wiring and perform an Electrical Pretest. If the lamp flashes, you go straight to the Air Pretest. That level of branching logic is what saves you from replacing parts you don’t need. The manual also includes the Step A Procedure on page 4 – a simple key-on lamp check that rules out basic power supply issues before you dive into the transmission itself. Anyone who skips that step deserves the 4-hour hour meter they’ll burn chasing ghosts.

Suggested Tools and Part Numbers for Gen II Work

Page 2 lists the specific Kent-Moore tools you need: the J-43318 Eaton Test Adapter Kit, J-38351-B Serial Link Adapter, J-42660 Parallel Data Module, and a standard Volt/Ohm Meter (Part No. 5505027). Also calls out a 0–100 PSI air pressure gauge. These aren’t suggestions; they’re the tools the factory used to validate the diagnostics. If you’re using a generic OBD-II reader instead of the proper serial link adapter, you’re not seeing the raw data the transmission control unit is sending. The manual also gives Eaton Service Parts phone numbers (1-888-880-0970 ext. 1) for the Data Link Tester (MF-KIT-04) and Service Ranger software. That kind of supplier detail belongs in every shop’s binder.

Which Trucks Does This Manual Cover?

This is the Quick Reference Guide for Gen II AutoShift models only – not Gen I, not the UltraShift series. If you’re working on a 2000–2002 Class 8 truck with an Eaton Fuller automated transmission that says “AutoShift Gen II” on the data plate, this is your manual. The manual references the full Service Manual (Eaton TRSM-0062) and Driver Instructions (Eaton TRDR-0062) as companion documents, so understand this is the diagnostic quick-start, not the full rebuild manual. But for code retrieval, engine-running safety checks, and air system pre-tests, it’s the fastest path to a fix.

20 Pages of Focused Transmission Diagnostics

Twenty pages. That’s lean. Every page carries a specific purpose: general warnings (page 2), tool list (page 2), diagnostic flowchart (page 3–4), and then branch procedures for active codes, inactive codes, and symptom-based troubleshooting. No fluff. No marketing. Just the sequence of tests Eaton Fuller validated. The manual even covers the case where the vehicle has no service lamp – a common omission on some OEM dashboards. It tells you to go directly to Step B and use the gear display “N” light instead. That’s the kind of edge-case detail that saves you five hours of head-scratching.

General Warnings: They’re in There for a Reason

Page 2 has a block of warnings that reads like it was written by someone who’s pulled a tow truck driver out of a rollover. “Do not release the parking brake or attempt to select a gear until the air pressure is at the correct level.” “Do not operate vehicle if alternator lamp is lit or if gauges indicate low voltage.” That last one is critical – low voltage to the transmission ECU can cause random shift faults, and a tech who ignores it will keep chasing ghost codes. The manual also covers towing procedure: shift to neutral, lift drive wheels, or disconnect driveline. If you’ve ever seen a transmission burn up because someone flat-towed without pulling the driveline, you’ll respect those lines.

Related Publications: Where to Go Next

Inside the manual you’ll find references to the full AutoShift Service Manual (Eaton TRSM-0062) and the Driver Instructions. For deeper diagnostics, pair this guide with the Eaton Fuller Fault Code Charts APMT-1234″> and the Eaton Fuller Automated Transmissions Troubleshooting Guide”>. If your truck has a HD FR/FRO transmission, the Eaton Fuller HD FR/FRO Transmissions TRSM2400 Service Manual – Section: Auxiliar”> covers the auxiliary section. For background on how the ECU communicates with the truck’s systems, read up on On-board Diagnostics (OBD)”> and understand that this manual uses a proprietary data link, not standard J1939. And if you need a refresher on Manual Transmission”> fundamentals, that context helps when diagnosing automated shift behavior.

Q: Does this manual cover the AutoShift Gen I?

No. This is strictly for Gen II models. Gen I uses a different shift control module and a different diagnostic flowchart.

Q: What tools are required to run the diagnostics?

You need a Kent-Moore J-43318 Test Adapter Kit and a serial link adapter J-38351-B (RP-1202). A standard volt/ohm meter is also called out. Without the adapter, you can’t read transmission-specific codes.

Q: Is this the full service manual?

No. It’s a 20-page diagnostics quick-reference. For rebuild procedures, torque specs on internal fasteners, and overhaul steps, you need the full Service Manual (Eaton TRSM-0062).

Q: Can I use this with a PC-based tool like Service Ranger?

Yes. The manual references both the Data Link Tester (MF-KIT-04) and the Service Ranger PC software. The manual gives the basic flowchart; the software provides live data logging and code reading. Use them together.

You can spend a week sorting through internet forum threads for AutoShift Gen II diagnostics, or you can set this 20-page OEM manual on your bench and follow the factory sequence. It tells you which tools to buy, which air pressure to verify, and how to step through active and inactive codes without guessing. Access the Factory Manual now and keep it in your shop binder next to your torque wrenches.