Toyota 4Runner: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Brake System|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
Low pedal or spongy pedal |
Fluid leaks in brake system (for Hydraulic brake booster) |
- |
|
Fluid leaks in brake system (for Vacuum brake booster) |
- |
|
|
Air in brake system (for Hydraulic brake booster) |
|
|
|
Air in brake system (for Vacuum brake booster) |
|
|
|
Front brake piston seals (Worn or damaged) |
|
|
|
Rear brake piston seals (Worn or damaged) |
|
|
|
Hydraulic brake booster (Faulty) |
|
|
|
Brake master cylinder (Faulty) |
|
|
|
Brake drag |
Brake pedal free play (Minimum) (for Hydraulic brake booster) |
|
|
Brake pedal free play (Minimum) (for Vacuum brake booster) |
|
|
|
Parking brake pedal travel (Out of adjustment) |
|
|
|
Parking brake wire (Sticking) |
|
|
|
Parking brake shoe clearance (Out of adjustment) |
|
|
|
Front brake pad (Cracked or distorted) |
|
|
|
Rear brake pad (Cracked or distorted) |
|
|
|
Front brake piston (Stuck) |
|
|
|
Rear brake piston (Stuck) |
|
|
|
Front brake piston (Frozen) |
|
|
|
Rear brake piston (Frozen) |
|
|
|
Parking brake tension or return spring (Faulty) |
|
|
|
Hydraulic brake booster (Faulty) |
|
|
|
Brake master cylinder (Faulty) |
|
|
|
Brake pull |
Front brake piston (Stuck) |
|
|
Rear brake piston (Stuck) |
|
|
|
Front brake pad (Oily) |
|
|
|
Rear brake pad (Oily) |
|
|
|
Front brake piston (Frozen) |
|
|
|
Rear brake piston (Frozen) |
|
|
|
Front brake disc (Scored) |
|
|
|
Rear brake disc (Scored) |
|
|
|
Front brake pad (Cracked or distorted) |
|
|
|
Rear brake pad (Cracked or distorted) |
|
|
|
Hydraulic brake booster (Faulty) |
|
|
|
Brake master cylinder (Faulty) |
|
|
|
Hard pedal but brake inefficient |
Fluid leaks in brake system (for Hydraulic brake booster) |
- |
|
Fluid leaks in brake system (for Vacuum brake booster) |
- |
|
|
Air in brake system (for Hydraulic brake booster) |
|
|
|
Air in brake system (for Vacuum brake booster) |
|
|
|
Front brake pad (Worn) |
|
|
|
Rear brake pad (Worn) |
|
|
|
Front brake pad (Cracked or distorted) |
|
|
|
Rear brake pad (Cracked or distorted) |
|
|
|
Front brake pad (Oily) |
|
|
|
Rear brake pad (Oily) |
|
|
|
Front brake pad (Glazed) |
|
|
|
Rear brake pad (Glazed) |
|
|
|
Front brake disc (Scored) |
|
|
|
Rear brake disc (Scored) |
|
|
|
Hydraulic brake booster (Faulty) |
|
|
|
Brake master cylinder (Faulty) |
|
|
|
Noise from brakes |
Front brake pad (Cracked or distorted) |
|
|
Rear brake pad (Cracked or distorted) |
|
|
|
Front brake installation bolt (Loose) |
|
|
|
Rear brake installation bolt (Loose) |
|
|
|
Front brake disc (Scored) |
|
|
|
Rear brake disc (Scored) |
|
|
|
Rear brake pad support plate (Loose) |
|
|
|
Front brake pad (Dirty) |
|
|
|
Rear brake pad (Dirty) |
|
|
|
Front brake pad (Glazed) |
|
|
|
Rear brake pad (Glazed) |
|
|
|
Parking brake tension or return spring (Faulty) |
|
|
|
Front brake anti-squeal shim (Damaged) |
|
|
|
Rear brake anti-squeal shim (Damaged) |
|
|
|
Parking brake shoe hold-down spring (Damaged) |
|
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Precaution
PRECAUTION
CAUTION:
Care must be taken to replace each part properly as it could affect the performance
of the brake system and result in a driving hazard. Replace the parts with parts
having th ...
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TERMINALS OF ECM
1. CHECK ECM
HINT:
The standard voltage at each ECM terminal is shown in the table below.
In the table, first follow the information under "Condition". Look under "Terminal
No. (Symbol)" for the terminals to inspect ...
System Diagram
SYSTEM DIAGRAM
Communication Table
Sender
Receiver
Signal
Line
Main body ECU (Multiplex network body ECU)
Combination meter assembly
Front door courtesy light switch LH signa ...
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