Engine & fuel system
4 documented faults — symptoms, causes and workshop fixes.
Hesitation/lack of power when accelerating after decelerating in 2nd gear at approx. 1600rpm
Overview
- Affects
- All models with 1SZ-FE engine code.
- Remedy
- Fit modified part
Cause
Engine control module (ECM) software fault.
Repair
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Fit modified engine control module (ECM).
Data: Motorwise Workshop. Bulletin 8.
Noise from auxiliary drive belt when starting engine from cold
Overview
- Affects
- All models with 1SZ-FE/2SZ-FE engine codes, →08/06.
- Remedy
- Fit new part
- Parts
- 4 parts
Cause
Insufficient tension of auxiliary drive belt.
Repair
- Fit new auxiliary drive belt.
- Tension auxiliary drive belt to manufacturer's specification.
Parts4 parts
| Part | Part number | Qty |
|---|---|---|
| Auxiliary drive belt - 1,0 with AC | 90080-91199 | 1 |
| Auxiliary drive belt - 1,0 without AC | 90080-91198 | 1 |
| Auxiliary drive belt - 1,3 with AC | 99366-K1770 | 1 |
| Auxiliary drive belt - 1,3 without AC | 90080-91198 | 1 |
Data: Motorwise Workshop. Bulletin 9.
Abnormal noise from exhaust when engine idling at operating temperature
Cause
Unsatisfactory design of rear exhaust silencer gasket.
Repair
- Fit modified rear exhaust silencer gasket.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Rear exhaust silencer gasket | 17451-0J011 | 1 |
Data: Motorwise Workshop. Bulletin 10.
Oil leak from front of engine
Cause
Unsatisfactory design of timing chain cover.
Repair
- Fit modified timing chain cover.
Data: Motorwise Workshop. Bulletin 11.
Electrical & ignition
1 documented fault — symptoms, causes and workshop fixes.
Whistling noise when driving with front door window open
Cause
Poor manufacture of door mirror.
Repair
- Renew door mirror.
Data: Motorwise Workshop. Bulletin 5.
Brakes
3 documented faults — symptoms, causes and workshop fixes.
Brakes squeal
Overview
- Affects
- All models.
Cause
Replacement brake pads fitted without anti-squeal shims.
Repair
- Ensure brake pad anti-squeal shims are fitted.
- Replacement shims available separately.
Data: Motorwise Workshop. Bulletin 2.
Handbrake lever difficult to operate when driver's seat in fully forward position
Overview
- Affects
- All models built in UK and Turkey, →07/07.
Cause
Incorrect adjustment of handbrake mechanism.
Repair
- Adjust handbrake mechanism to obtain 3-6 notches at handbrake lever whilst applying 200 N.
- Carry out brake bedding-in procedure: Drive vehicle at 25 mph (40 kph). Apply handbrake lever 1 notch. Drive vehicle for 400 metres. Release handbrake lever. Wait 5 minutes. Repeat above procedure twice.
Data: Motorwise Workshop. Bulletin 3.
ABS warning lamp illuminated
Overview
- Affects
- All models.
- Fault codes
C0000
Symptoms
Trouble code stored in ABS control module fault memory: C0000.
Cause
ABS control module faulty.
Repair
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Replace ABS control module.
Data: Motorwise Workshop. Bulletin 6.
Suspension & drivetrain
1 documented fault — symptoms, causes and workshop fixes.
Noise from rear suspension over uneven surfaces or when cornering
Rear axle hub assembly bolts insufficient torque, allowing movement. Fix: adjust and tighten.
Overview
- Affects
- VIN VNK JV123 0A001432-0A019493VIN VNK JV133 0A003763-0A019481VIN VNK KV123 0A001508-0A019491VIN VNK KV133 0A003757-0A019381
- Remedy
- Adjust & tighten
Symptoms
Excessive rear tyre wear.
Repair steps
- Support rear suspension under spring.
- Remove shock absorber lower mounting bolt.
- Tighten hub assembly bolts to 60 Nm.
- Refit shock absorber lower mounting bolt. Tightening torque: 49 Nm.
Data: Motorwise Workshop. Bulletin 1.
Body & trim
3 documented faults — symptoms, causes and workshop fixes.
Buzzing or rattling noises from front seat belt and seat belt buckle
Overview
- Affects
- All models built in Japan.
Cause
Seat belt upper anchorage point trim panel vibrating.
Seat belt buckle vibrating against seat side trim panel.
Repair
- Apply felt tape to back of seat belt upper anchorage point trim panel.
- Apply felt tape to seat belt buckle.
Data: Motorwise Workshop. Bulletin 4.
Rattling noise from front door area
Cause
Door lock button link rod making contact with door panel.
Repair
- Fit foam spacer between door lock button link rod and door panel.
Data: Motorwise Workshop. Bulletin 7.
Bonnet will not open
Cause
Unsatisfactory design of bonnet release cable.
Repair
- Fit modified bonnet release cable.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Bonnet release cable | 53630-0D011 | 1 |
Data: Motorwise Workshop. Bulletin 12.
Glossary
Technical terms used in this guide.
- ECM
- Engine control module — the electronic unit that manages the engine
- VIN
- Vehicle identification number — 17 characters, found at the base of the windscreen and on the V5C logbook
- Nm
- Newton-metres — the standard unit for how tightly a bolt is done up
- ABS
- Anti-lock braking system — stops the wheels locking under hard braking
- Control Module
- A control unit for one of the vehicle's systems (engine, gearbox, brakes, body, and so on)
- Fault Memory
- The list of stored trouble codes in a control module
- Trouble Code
- A standardised fault code stored by a control module, read with a diagnostic tool
- Auxiliary Drive Belt
- The belt that drives the alternator, water pump, steering pump or air-conditioning compressor
Frequently asked questions
What are the common faults with the Toyota Yaris 1.0?
This guide contains 12 workshop bulletins for the Toyota Yaris 1.0. Of these, four concern the engine and fuel system and three the brakes. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Toyota Yaris 1.0 have these faults?
No. These are patterns documented across the model by workshops, not predictions for an individual vehicle. Where a fault applies only to certain vehicles or VIN ranges, that is listed with the fault.
Can I check for Toyota Yaris 1.0 faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.