Parts for your 2006 Toyota Bb-Drive belt

2006 Toyota bB drive-belt: what it does and when to replace it

Is a drive-belt used on a 2006 Toyota bB? Yes. Factory service information for the bB’s common engines confirms an external ribbed auxiliary belt (serpentine/drive-belt) is fitted. Toyota documentation for the NZ-series 1NZ-FE/2NZ-FE (as used in NCP30/31/35 bB and related Scion xB), plus Daihatsu/Toyota manuals for the 3SZ-VE and K3-VE (as used in QNC20/21/25 bB from 2005 on), all show a belt driving the alternator and A/C compressor, and on certain variants the water pump. These engines use a timing chain for the camshafts, so there’s no timing belt—just the auxiliary drive-belt to service. Technical basis: Toyota Repair Manuals for 1NZ-FE/2NZ-FE, Toyota bB QNC2# Repair Manual, Daihatsu Service Manual for 3SZ-VE/K3-VE, and Toyota New Car Features for NZ-series engines.

On a 2006 Toyota bB, the drive-belt’s job is to spin the alternator to keep the battery charged, power the air-con compressor for cold air, and—depending on engine—turn the water pump. Some models with hydraulic power steering use the same belt to run the steering pump, others use electric assist and won’t. If that belt slips or snaps, you can cop squeals, a flat battery, overheating, or no A/C on a scorching arvo.

Good servicing means eyeballing the belt every visit—about every 10,000–15,000 kilometres in Aussie and Kiwi conditions. Look for cracking between ribs, glazing (shiny patches), frayed edges, or rubber dust around the pulleys. A chirp on cold start or a squeal when the A/C kicks in can point to wear or a lazy tensioner.

Replacement timing typically lands at 60,000–100,000 kilometres or 4–6 years, but condition beats the calendar. If the belt’s soaked in oil or coolant, it’s had it. When fitting a new one, use the correct length/rib count for the engine and options (A/C, hydraulic PAS). The bB may have a spring-loaded tensioner or a manual adjuster—follow the workshop spec so the belt isn’t guitar-string tight or floppy. Spinning the idler and tensioner pulleys by hand during replacement is smart, any roughness or wobble means swap them too.

Pro tip: a worn belt can mask a failing tensioner. If the noise returns soon after a new belt, the tensioner or an accessory pulley is likely the real culprit.

• Check belt condition each service (10,000–15,000 km).
• Replace at 60,000–100,000 km or if cracked, glazed, noisy, or contaminated.
• Verify routing and tension, inspect tensioner and idlers at the same time.

FAQs

Does the 2006 Toyota bB have a timing belt or a chain?
It runs a timing chain across its common engines (1NZ-FE/2NZ-FE, 3SZ-VE, K3-VE). There’s still an external auxiliary drive-belt for the alternator, A/C, and sometimes the water pump, which needs periodic inspection and replacement based on condition.

How often should the drive-belt be replaced?
Inspect at every service and plan for replacement around 60,000–100,000 kilometres or 4–6 years. If you notice cracks, glazing, squeals, or belt dust—or you’re in hot, dusty, or stop–start conditions—do it sooner.

What belt size does my 2006 bB use?
It varies by engine (1.3 or 1.5) and whether the car has A/C and hydraulic power steering. Match by VIN/engine code and options, or check the parts catalogue. Grabbing the correct rib count and length is critical for proper tension and accessory drive.