Get the essential electrical information for your 2016-2020 Toyota Mirai with this original OEM workshop manual. This PDF manual includes:

• Wiring Diagram: Detailed schematics for the electric motor (4JM) and other electrical components.
• Reference Manual EM32C1E: Comprehensive reference material for electrical systems and diagnostics.

This manual provides all the necessary electrical diagrams and information to support accurate troubleshooting and repairs. Perfect for technicians and enthusiasts working on the First Generation Mirai models (JPD10L & JPD10R).

Sample Pages: 2016-2020 Toyota Mirai Wiring Diagram

🛠️ Common Issues with the 2016-2020 Toyota Mirai

📝 Comprehensive Overview: 2016–2020 Toyota Mirai (1st Generation)

The Toyota Mirai, introduced in 2016, is a hydrogen fuel cell electric vehicle (FCEV) designed as Toyota’s zero-emissions alternative to battery-electric vehicles. The first-generation Mirai (2016–2020) is built on a modified version of the Lexus HS/Toyota Prius platform and was sold primarily in California, Japan, and select markets with hydrogen fueling infrastructure.

🔍 Quick Facts

⚙️ Powertrain & Performance

💡 Unlike BEVs (battery EVs), the Mirai generates electricity on demand using hydrogen and emits only water vapor.

🛠️ Common Issues & Reliability

The Toyota Mirai is generally very reliable, with few moving parts in its electric drivetrain. However, given its advanced fuel cell system and dependence on hydrogen fueling infrastructure, there are some unique ownership considerations.

1. Limited Refueling Infrastructure

• Issue: Very few hydrogen stations outside of California, limiting the practicality of the car.
• Solution: Use Toyota’s hydrogen station locator app; ensure proximity to stations before purchase.

2. Hydrogen Sensor Faults

• Issue: Some early models experienced false hydrogen leak warnings or sensor errors, triggering warning lights.
• Fix: Sensor replacement under warranty; updated software available.
• Cost: Covered under warranty in most cases.

3. Fuel Cell System Malfunctions

• Issue: Rare issues with the fuel cell stack or related cooling systems.
• Fix: Toyota offers an 8-year / 100,000-mile warranty on the fuel cell system.

4. 12V Battery Drain

• Issue: Similar to hybrid Prius models, the 12V battery may drain when the vehicle is parked for extended periods.
• Fix: Replace 12V battery or use a battery maintainer.

5. Suspension Clunk or Vibration

• Issue: Some owners report light clunking from the front suspension on rough roads.
• Fix: Strut mount or sway bar bushing replacement; generally minor.

📅 Maintenance Schedule

✅ No oil changes or traditional engine maintenance required.

📢 Recalls & Service Bulletins

 Notable Recalls:

1. Hydrogen Control ECU Recall (2016–2017)
   • Issue: Risk of overvoltage during fuel cell power generation.
   • Fix: ECU software update.
2. Fuel Cell Water Evacuation Issue
   • Issue: Improper water drainage from fuel cell may cause freezing.
   • Fix: Service update applied under TSB.
3. Hydrogen Tank Leak Detection Update
   • Fix: Sensor replacement to improve leak detection accuracy.

🆚 Competitors & Alternatives

✅ Pros

• ✅ Zero Emissions – Only water vapor as byproduct.
• ✅ Quick Refueling Time – ~5 minutes vs. 30+ mins for BEVs.
• ✅ Smooth & Silent Operation – Electric torque and quiet cabin.
• ✅ Toyota Reliability – Backed by long warranties and extensive testing.
• ✅ Eligible for HOV lanes & incentives – In CA and other select states.

❌ Cons

• ❌ Hydrogen Infrastructure – Limited to select regions (mainly California).
• ❌ Higher Purchase Price (New) – Subsidized with lease incentives, but still high.
• ❌ Low Resale Value – Due to limited demand and infrastructure.
• ❌ Trunk Space Intrusion – Hydrogen tanks reduce trunk capacity.

📚 Owner Resources

• Toyota Mirai Owner’s Manual – Available via Toyota.com
• Toyota Fuel Cell Tech Info – Visit Toyota’s advanced technology section for fuel cell basics

🔚 Final Verdict

The 2016–2020 Toyota Mirai is a pioneering hydrogen-powered vehicle that delivers quiet, clean, and smooth driving—best suited for California residents near hydrogen stations. It’s an innovative car that offers BEV-like smoothness without long charging times, but its practicality is limited by infrastructure.

👉 Verdict: Perfect for eco-conscious drivers in hydrogen-supported regions. Avoid if you live outside areas with reliable hydrogen refueling options. 🌱🚗💨