Toyota Tundra Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

  • 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.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
SFI System

Symptom

Suspected Area

See page

Engine does not crank (Does not start)

Battery

Starter (for 1.6 kW Type)

Starter (for 2.0 kW Type)

Cranking Holding Function Circuit

Starter Relay

Park/Neutral Position Switch (for 2WD)

Park/Neutral Position Switch (for 4WD)

VC Output Circuit

No initial combustion (Does not start)

ECM Power Source Circuit

Crankshaft Position Sensor

Camshaft Position Sensor

Ignition System

Fuel Pump Control Circuit

Fuel Injector Circuit

ECM

VC Output Circuit

Immobiliser System

Engine cranks normally but difficult to start

Fuel Pump Control Circuit

EGR Valve Assembly

Engine Coolant Temperature Sensor

Ignition System

Compression

Fuel Injector Assembly

Fuel Injector Circuit

Air Induction System

Throttle with Motor Body Assembly

PCV Hose

Difficult to start with cold engine

Ignition System

Spark Plug

Fuel Pump Control Circuit

Fuel Injector Assembly

Difficult to start with warm engine

Fuel Injector Assembly

Ignition System

Spark Plug

Fuel Pump Control Circuit

High engine idle speed

Electronic Throttle Control System

A/C Signal Circuit (for Automatic Air Conditioning System)

A/C Signal Circuit (for Manual Air Conditioning System)

ECM Power Source Circuit

Acoustic Control Induction System (ACIS)

Low engine idle speed (Poor idling)

Electronic Throttle Control System

A/C Signal Circuit (for Automatic Air Conditioning System)

A/C Signal Circuit (for Manual Air Conditioning System)

Fuel Pump Control Circuit

Intake System

Acoustic Control Induction System (ACIS)

PCV Hose

Rough idling

Compression

Spark Plug

Fuel Injector Assembly

Ignition System

Fuel Pump Control Circuit

Electronic Throttle Control System

Intake System

Acoustic Control Induction System (ACIS)

PCV Hose

Mass Air Flow Meter

EGR Valve Assembly

Hunting (poor idling)

Electronic Throttle Control System

Intake System

ECM Power Source Circuit

Acoustic Control Induction System (ACIS)

Drive start control

Hesitation and/or poor acceleration

Fuel Pump Control Circuit

Spark Plug

Ignition System

Fuel Injector Assembly

Mass Air Flow Meter

Electronic Throttle Control System

Intake System

Compression

Drive start control

Brake override system

Surging (Poor driveability)

Spark Plug

Fuel Pump Control Circuit

Ignition System

Fuel Injector Assembly

Mass Air Flow Meter

Variable Valve Timing System

Compression

Engine stalls soon after starting

Fuel Pump Control Circuit

Spark Plug

Ignition System

Fuel Injector Assembly

Variable Valve Timing System

Electronic Throttle Control System

Intake System

PCV Hose

Compression

EGR Valve Assembly

Engine stalls only during A/C operation

A/C Signal Circuit (for Automatic Air Conditioning System)

A/C Signal Circuit (for Manual Air Conditioning System)

ECM

Unable/difficult to refuel

Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.)

-

MIL (malfunction indicator lamp) malfunction

MIL Circuit

Combination meter assembly

    Precaution

    Readiness Monitor Drive Pattern

    See More:

    Toyota Tundra Owners Manual > Toyota Tundra Owners Manual: For owners
    Reporting safety defects for U.S. owners If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) in addition to notifying Toyota Motor Sales, U.S.A., Inc. (Toll-fr ...

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