Engine & fuel system
2 documented faults — symptoms, causes and workshop fixes.
Intermittent failure to start when engine is hot
Symptoms
Loss of communication between control modules.
Cause
No power supply to engine management system due to poor connection at fuse(s).
Repair
- Check electrical connection between engine management system fuse(s) and engine bay fuse box/relay plate. Repair/replace component(s) as necessary.
Data: Motorwise Workshop. Bulletin 6.
Erratic idle
Overview
- Affects
- All models with Diesel engines.
- Fault codes
P1238
Symptoms
Trouble code stored in engine control module (ECM) fault memory: P1238.
Cause
Faulty fuel injector(s).
Repair
- Check fuel injectors for leaks. Repair/replace component(s) as necessary.
- If fuel injector(s) replaced: Carry out injector calibration code programming in engine control module (ECM).
Data: Motorwise Workshop. Bulletin 9.
Electrical & ignition
2 documented faults — symptoms, causes and workshop fixes.
Electric windows not fully closing
Overview
- Affects
- All models.
Cause
Battery has been disconnected.
Window channel movement restricted.
Repair steps
- Check window channel for restrictions.
- Disconnect battery for 10 seconds.
- Reconnect battery.
- Switch ignition ON.
- Open window half way.
- Close window and hold window switch in closed position for approximately 12 seconds.
- Carry out procedure for remaining windows.
- Check one-touch automatic function of windows.
Data: Motorwise Workshop. Bulletin 2.
Abnormal noise from front windows during operation
Symptoms
Front door window glass detached from window winder mechanism.
Cause
Poor manufacture of front door window glass mounting bolts.
Repair
- Fit modified front door window glass mounting bolts and tighten to 8 Nm.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Bolt | 91671-80612 | 2 |
Data: Motorwise Workshop. Bulletin 5.
Brakes
2 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 1.
Parking brake ON warning lamp illuminates intermittently when driving
Low brake fluid level.
Overview
- Affects
- All models.
Repair steps
- Top up brake fluid to correct level.
- Check brake pad thickness. Replace component(s) as necessary.
- Check for brake fluid leaks. Replace component if necessary.
Data: Motorwise Workshop. Bulletin 8.
Steering
1 documented fault — symptoms, causes and workshop fixes.
Ignition switch turns freely with key, but engine fails to crank
Symptoms
Engine will not crank. Steering column lock not disengaging.
Cause
Internal damage to ignition switch/steering column lock assembly.
Repair
- Fit modified ignition switch/steering column lock assembly.
Data: Motorwise Workshop. Bulletin 4.
Clutch & gearbox
2 documented faults — symptoms, causes and workshop fixes.
Oil leak from transmission
Overview
- Affects
- All models with automatic transmission (AT).
Cause
Transmission breather hose chafed through on wiring harness.
Repair
- Replace transmission breather hose.
- Ensure suitable clearance between transmission breather hose and surrounding components.
Data: Motorwise Workshop. Bulletin 7.
Air conditioning (AC) compressor not operating
Cause
AC compressor clutch relay faulty.
Repair
- Replace AC compressor clutch relay.
Data: Motorwise Workshop. Bulletin 10.
Wipers & visibility
1 documented fault — symptoms, causes and workshop fixes.
Windscreen wipers not working
Overview
- Affects
- All models, →02/08.
- Remedy
- Fit modified part
- Parts
- 5 parts
Cause
Water ingress into windscreen wiper motor.
Repair
- Fit modified windscreen wiper motor.
- Fit waterproof cover onto windscreen wiper motor.
Parts5 parts
| Part | Part number | Qty |
|---|---|---|
| Windscreen wiper motor - RHD | 85110-60330 | 1 |
| Windscreen wiper motor - LHD | 85110-60350 | 1 |
| Waterproof cover - RHD | 85111-60130 | 1 |
| Waterproof cover - LHD | 85111-60110 | 1 |
| Clamp | 85371-60040 | 1 |
Data: Motorwise Workshop. Bulletin 3.
Glossary
Technical terms used in this guide.
- ECM
- Engine control module — the electronic unit that manages the engine
- Nm
- Newton-metres — the standard unit for how tightly a bolt is done up
- AC
- Air conditioning — the system that cools the cabin
- 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
- Relay
- An electrically operated switch
- Trouble Code
- A standardised fault code stored by a control module, read with a diagnostic tool
- Wiring Harness
- The bundled cables that carry power and signals around the vehicle
- Calibration
- Setting a sensor or module so its readings match the real world
Frequently asked questions
What are the common faults with the Toyota Landcruiser Prado 4.0?
This guide contains 10 workshop bulletins for the Toyota Landcruiser Prado 4.0. Of these, two concern the engine and fuel system and two the electrical and ignition. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Toyota Landcruiser Prado 4.0 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 Landcruiser Prado 4.0 faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.