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Mitsubishi FB16KT Troubleshooting Manual – 130 Pages of Factory Diagnostics

I’ve seen a lot of manuals come through this shop. Some are worth the paper they’re printed on. Others, like the Mitsubishi FB16KT Troubleshooting Manual, earn their spot on the bench. This is the real deal—130 pages of control circuit diagnostics that Mitsubishi themselves wrote. No aftermarket translation, no guesswork. If you’re chasing an electrical fault on an FB16KT forklift, this is the only document you want on your tablet.

You get a full alarm list starting on page 2-5. Every code from E0 (right motor overheating) to 68 (battery voltage low) is listed with the exact page to turn to for the procedure. The electrical system diagram is on page 2-3—read that before you touch a multimeter. I’ve seen techs fry a controller because they didn’t understand the regeneration circuit. This manual lays it out.

130 Pages of Control Circuit Diagnostics

The table of contents reads like a checklist of every common failure mode. Right motor faulty armature circuit? Page 2-23. Left motor shorted transistor? Page 2-49. Pump motor wire breakage? Page 2-94. Each fault gets its own section with diagnostic steps, test points, and pass/fail criteria. You don’t need to guess—the manual tells you what to measure and where. For torque specs on the motor mounts or electrical connections, you’ll want the companion Mitsubishi FB16KT FB18KT FB20KT Service Manual. This troubleshooting manual is purely for the control circuits.

Alarm List and Diagnostic Codes – Where to Start

Page 2-5 gives you the alarm list. Every two-digit code matches a specific fault. For example, code 10 is right motor faulty armature circuit. The manual then routes you to the correct page. You follow the steps: measure resistance between terminals, check for shorts to ground, verify transistor drive signals. If you skip the electrical system diagram on page 2-3, you’ll be tracing wires blind. That’s a good way to misdiagnose a bad motor as a bad controller. The manual prevents that.

Brake Oil Low Level Warning – Don’t Overlook It

Page 2-21 covers the brake oil low level alarm. This isn’t just a warning light—it’s a safety issue. The manual walks you through checking the sensor resistance, the wiring harness, and the fluid level. I’ve had forklifts come in with the brake oil low alarm triggering, and the operator thought it was a sensor failure. Turned out the fluid was low because of a leak. The manual’s step-by-step approach caught it. Safety first, always.

Does This Manual Cover Motor Brushes and Overheating?

Yes, and it’s detailed. Sections E0 through E6 (pages 2-7 to 2-19) cover overheating and worn brushes for the right motor, left motor, and pump motor. Each section includes the expected brush length, resistance checks, and thermal sensor tests. If you’re getting sporadic overheating alarms, the manual tells you to check the current sensor first—not just replace the motor. That’s the kind of diagnostic logic that saves you hours. For a broader view of the FB series, see the Mitsubishi FB-CA Series Troubleshooting Manual – 133 Pages of Factory Diagnostic.

Factory Specs vs Aftermarket – The Real Difference

I’ve used aftermarket troubleshooting guides before. They often paraphrase the factory procedure and leave out critical details like the exact transistor test points or the armature circuit resistance values. This manual is a direct OEM reproduction. It includes the electrical schematic for DC motor models FC and MC (pages 2-133 and 2-135). The wiring diagrams are factory-correct. If you’re working on a different vehicle, the Mitsubishi Pajero Wiring Harness Troubleshooting Guide might be useful, but for the FB16KT, stick with this. External context: refer to the Automotive Industry Overview for general industry standards. And the Automotive Industry Overview provides background on diagnostic protocols.

Does this manual cover the electrical system?

Yes, pages 2-3 and 2-131.

What about brake oil level?

Page 2-21 covers the brake oil low level alarm. It gives the procedure to check the sensor, wiring, and fluid level. Don’t skip this – low brake oil on a forklift is a safety hazard.

Can I use this manual for the FB18KT?

This manual is specific to the FB16KT. The control circuit troubleshooting is similar across the FB series, but torque specs and component locations may differ. Always use the manual for your exact model. The Mitsubishi FB16KT FB18KT FB20KT Service Manual covers the other models.

How do I interpret the alarm list?

The alarm list on page 2-5 gives you a two-digit code for each fault. For example, code 10 means right motor faulty armature circuit. The manual then directs you to the specific page for that code. You follow the diagnostic steps: measure resistance, check for shorts, verify transistor drives. Each step has a pass/fail condition. If you skip the electrical system diagram on page 2-3, you’ll be guessing which wire is which. That’s how you burn up a controller. This manual tells you exactly what to measure and where. I’ve seen techs try to ‘wing it’ and end up replacing a good motor because they didn’t check the armature circuit first. The manual saves you that headache.

Down to the wire? Get the factory data. Access the Factory Manual from AutoRepairManuals and keep it on your bench. 130 pages of Mitsubishi’s own diagnostics, no reprints, no copy. Your FB16KT will thank you.