Engine & fuel system
2 documented faults — symptoms, causes and workshop fixes.
Engine malfunction indicator lamp (MIL) illuminated. Trouble code stored: P0234
Engine control module (ECM) software fault. Fix: fit a new part.
Overview
- Affects
- All models with G16E-GTS engine code.
- Fault codes
P0234- Remedy
- Fit new part
Symptoms
Engine runs in limp home mode.
Repair steps
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Re-program engine control module (ECM) with upgraded software.
- Erase trouble code. If trouble code cannot be erased: Disconnect battery for 5 minutes.
- Fit new ECM software version label.
Parts
| Part | Part number | Qty |
|---|---|---|
| Engine control module (ECM) software version label | 89661-5CD90 | 1 |
Data: Motorwise Workshop. Bulletin 2.
Vibration, noise from engine compartment at approximately 2000-2400rpm
Cause
Unsatisfactory design of LH engine mounting.
Repair
- Fit modified LH engine mounting.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| LH engine mounting | 12372-18060 | 1 |
Data: Motorwise Workshop. Bulletin 4.
Brakes
1 documented fault — symptoms, causes and workshop fixes.
Noise and vibration through vehicle when braking
Overview
- Affects
- All models with G16E-GTS engine code.
- Remedy
- Fit modified part
- Parts
- 2 parts
Cause
Poor material characteristics of brake pads.
Corrosion between brake pads and brake discs.
Repair
- Fit modified front and rear brake pads.
- Inspect front and rear brake discs for excessive corrosion, replace if necessary.
Parts2 parts
| Part | Part number | Qty |
|---|---|---|
| Front brake pad kit | 04465-52400 | 1 |
| Rear brake pad kit | 04466-52220 | 1 |
Data: Motorwise Workshop. Bulletin 5.
Body & trim
1 documented fault — symptoms, causes and workshop fixes.
Warning message 'Pre-Collision System Unavailable' displayed in instrument panel
Front view camera control module software fault. Fix: re-program with updated software.
Overview
- Affects
- All models with front view camera.
- Remedy
- Software update
Symptoms
Trouble code stored in front view camera control module fault memory: C1A94.
Repair steps
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Re-program front view camera control module with upgraded software.
- Erase any stored trouble codes. Note: To carry out an effective repair a software upgrade will be required - refer to manufacturer.
Data: Motorwise Workshop. Bulletin 1.
Other
1 documented fault — symptoms, causes and workshop fixes.
Four wheel drive disengages by itself
Overview
- Affects
- All models with four wheel drive.
- Remedy
- Software update
Symptoms
Four wheel drive warning message displayed in multifunction display.
Cause
Four wheel drive control module software fault.
Repair
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Re-program four wheel drive control module with upgraded software. Note: To carry out an effective repair a software upgrade will be required - refer to manufacturer.
Data: Motorwise Workshop. Bulletin 3.
Glossary
Technical terms used in this guide.
- ECM
- Engine control module — the electronic unit that manages the engine
- Trouble Codes
- Standardised fault codes stored by the engine control module, read with a diagnostic tool
- LH
- Left-hand — the left side of the vehicle as you sit in it
- 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
- Limp Home
- A protective mode that limits power so the vehicle can be driven to a workshop
- Re-Program
- Update the software on a control module using the manufacturer's diagnostic tool
- Trouble Code
- A standardised fault code stored by a control module, read with a diagnostic tool
Frequently asked questions
What are the common faults with the Toyota Yaris 1.6 GR?
This guide contains five workshop bulletins for the Toyota Yaris 1.6 GR. Of these, two concern the engine and fuel system and one the brakes. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Toyota Yaris 1.6 GR 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 1.6 GR faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.