Lexus ES manuals

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

Symptom

Suspected Area

Link

Engine does not crank (Does not start)

Hybrid control system

VC output circuit (ECM 5 V output)

No initial combustion (Does not start)

ECM power source circuit

VC output circuit (ECM 5 V output)

Ignition system

Fuel system

Port fuel injector assembly

Direct fuel injector assembly

Fuel pump (for low pressure side)

Crankshaft position sensor

Intake system

Valve timing

EGR valve assembly

Engine cranks normally but difficult to start

ECM power source circuit

Throttle body with motor assembly

Fuel pump assembly (for high pressure side)

Fuel pump (for low pressure side)

Engine coolant temperature sensor

Fuel system

Ignition system

Compression

Port fuel injector assembly

Direct fuel injector assembly

Crankshaft position sensor

Intake system

Valve timing

EGR valve assembly

Incomplete intermittent combustion occurs (Does not start)

Fuel system

Fuel pump (for low pressure side)

Ignition system

Port fuel injector assembly

Direct fuel injector assembly

Crankshaft position sensor

Intake system

Valve timing

High engine speed

Throttle body with motor assembly

ECM power source circuit

PCV system

Low engine speed (Poor idle)

Fuel system

Throttle body with motor assembly

Port fuel injector assembly

Direct fuel injector assembly

Fuel pump assembly (for high pressure side)

PCV system

Intake system

Rough idle

Flow chart [Rough idling]

Throttle body with motor assembly

Port fuel injector assembly

Direct fuel injector assembly

Fuel pump assembly (for high pressure side)

Ignition system

Air fuel ratio sensor (sensor 1)

Air fuel ratio sensor (sensor 2)

Mass air flow meter sub-assembly

Manifold absolute pressure sensor

Compression

Fuel system

Intake system

Valve timing

EGR valve assembly

Hunting (Poor idle)

Throttle body with motor assembly

ECM power source circuit

Fuel system

Spark plug

Intake system

Drive start control

Hesitation/Poor acceleration (Poor driveability)

Port fuel injector assembly

Direct fuel injector assembly

Fuel system

Fuel pump assembly (for high pressure side)

Ignition system

Intake system

Valve timing

Brake override system

Drive start control

Surging (Poor driveability)

Fuel system

Fuel pump (for low pressure side)

Ignition system

Port fuel injector assembly

Direct fuel injector assembly

Engine stalls soon after starting

Fuel system

Throttle body with motor assembly

Crankshaft position sensor

Ignition system

Fuel pump assembly (for high pressure side)

Intake system

Valve timing

EGR valve assembly

MIL (Malfunction Indicator Lamp) malfunction

MIL Circuit

Meter/Gauge system

Unable/difficult to refuel

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

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