The Proton Waja MMC (short for Minor Model Change, typically referring to a facelifted version of the Proton Waja) is a Malaysian-made mid-size sedan. It was produced with both manual and automatic transmissions. Here’s a description of the auto gearbox used in the Proton Waja MMC:

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Proton Waja MMC Auto Gearbox Overview

Type:

4-speed automatic transmission (commonly sourced from Mitsubishi or Aisin, depending on the variant and engine)

Paired Engines:

• 1.6L Mitsubishi 4G18 SOHC
• 1.6L or 1.8L CAMPRO engines (some variants)
• 1.8L Renault engine (for some export variants)

Key Features:

• Electronically controlled automatic transmission (ECAT)
• Smooth gear transitions suitable for city and highway driving
• Overdrive (O/D) button included on gear selector (helps with fuel economy at higher speeds)
• Some variants may include adaptive shift logic (basic version), adjusting shift points based on driving behavior

Common Gear Positions:

• P – Park
• R – Reverse
• N – Neutral
• D – Drive
• 3, 2, L – Lower gears for engine braking or climbing

⚙️ Reliability and Maintenance Notes

• The gearbox is generally reliable if properly maintained.
• Regular ATF (Automatic Transmission Fluid) changes are critical – Proton recommends using SPIII or Dexron III ATF, depending on the specific gearbox variant.
• Symptoms of issues may include:
  
• Jerky gear shifts
• Delayed engagement
• Transmission slipping
• 
  
• Common fixes involve ATF flush, solenoid replacements, or in worse cases, a gearbox overhaul.

📌 Tips for Owners

• Always warm up the car slightly before driving aggressively.
• Avoid shifting from ''R'' to ''D'' (or vice versa) while the car is still moving.
• Use the O/D button on the highway for better fuel efficiency.

If you have a specific engine variant (e.g., 1.6 CAMPRO or 1.8 Renault), I can give more exact gearbox model details (e.g., the Jatco or Aisin gearbox codes). Let me know!