Description

Mitsubishi 4D56, 6G72, 6G74 Service Manual – Factory Emission Control Specs

If you are trying to get the emissions system on a Mitsubishi 4D56, 6G72, or 6G74 to pass inspection, you don’t have time for guesswork. Aftermarket manuals skip the factory vacuum routing and sensor resistance specs that make the difference between a working EGR and a check engine light. This is the OEM Mitsubishi 4D56, 6G72, 6G74 Service Manual — 14 pages of factory emission control procedures, component layouts, and service specifications. No aftermarket rewrites, just the original Mitsubishi documentation.

Mitsubishi 4D56, 6G72, 6G74 Service Manual: Emission System Procedures

The manual opens with a general outline of changes, including the addition of the 6G74 SOHC 24-valve engine and updated specs for the 6G72. Service specifications on page 2 list the purge control solenoid valve coil resistance at 21–27 ohms (20°C) and the EGR solenoid valve coil resistance at 28–36 ohms. For the 4D56 diesel, the lever position sensor output voltage is given – idle position 0.6–1.0u202fV, fully open 3.7–5.0u202fV. That is the data you need when bench testing components before reinstallation.

Component Layout and Vacuum Hose Diagrams

Page 3 shows the component layout for both the 6G72-SOHC 24-valve engine and the 6G74-SOHC 24-valve engine. Key parts are labeled: canister, catalytic converter, EGR valve, PCV valve, purge control solenoid valve, EGR control solenoid valve, and a 2-way valve. Vacuum hose piping diagrams for the 6G74 appear on page 5, with separate vacuum hose layouts for both engines on page 6. Routing these hoses wrong will trigger a DTC. This manual gives you the factory plumbing.

EGR System and Crankcase Emission Control

Separate sections cover the crankcase emission control system, evaporative emission control system, exhaust emission control system, and the EGR system. The EGR system is detailed twice — once for the 6G72/6G74 gasoline engines and once for the 4D56 diesel. Cautions on inspection (page 6) warn about backfiring risks and thermal shock to catalytic converters. Follow those cautions. I have seen techs crack a manifold by skipping the cool-down step.

Why Factory Documentation Beats Aftermarket for Emission Work

Aftermarket manuals often redraw vacuum diagrams or round resistance values to “close enough.” That isn’t how emissions systems work. A 28–36 ohm solenoid that reads 25 ohms still passes, but if you use a generic spec of 20–40, you might install a bad part. This manual comes from Mitsubishi itself. The 14 pages are dense with factory-verified data — no third-party interpretation. If you want to trust your rebuild, start here.

Who Needs This 14-Page Manual

Home garage enthusiasts with a Mitsubishi Montero, Mighty Max, or Dodge Stealth that uses these engines will find this manual essential. Beginners can follow the vacuum diagrams and component location photos without guesswork. Professional mechanics will appreciate the exact solenoid resistances and lever position sensor voltages for diagnosing intermittent emission faults. 14 pages may seem small, but each page carries technical weight. No wasted space.

Related manuals you might need: Mitsubishi 4D56 Engine 1991-1993 Service Manual and Mitsubishi 4D56 1995 Workshop Manual – OEM Factory Specs. For those with the Mitsubishi Dodge Stealth R/T Turbo, see Mitsubishi Dodge Stealth R/T Turbo 3000GT VR4 GTO Service Manual. You can also read about Automotive Industry Overview and Automotive Industry Overview.

Does this manual cover the 4D56 engine only?

No. It covers the 4D56 diesel and the 6G72/6G74 gasoline engines, all in one document.

How many pages does it have?

14 pages.

Are vacuum hose diagrams included for both engine families?

Yes. There is a vacuum hose piping diagram for the 6G74 SOHC 24-valve engine on page 5, and separate vacuum hose layouts for both the 6G72 and 6G74 on page 6. The diagrams are clear and labeled with part symbols matching the component layout on page 3. If you have ever chased a vacuum leak on a Mitsubishi, you know how valuable these diagrams are. They show routing from the purge control solenoid to the canister, the EGR control solenoid to the EGR valve, and the PCV system. Do not trust a YouTube video — use the factory drawing.

Does it include torque specs for emission components?

Not in this 14-page excerpt. The service specifications cover solenoid resistances and sensor voltages, not torque values. For fastener torque, you will need the full engine service manual for your specific engine. This manual is exclusively emission control.

Stop wasting time on generic aftermarket PDFs that mislabel vacuum ports. Get the real Mitsubishi data. Access the Factory Manual and have the OEM specs on your workbench in minutes.