Toyota Avalon Service & Repair Manual: 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)

Battery

ST relay

Starter assembly

Starter signal circuit

Smart key system (for start function)

VC output circuit (ECM 5 V output)

Park/neutral position switch assembly

No initial combustion (Does not start)

Immobiliser system

ECM power source circuit

VC output circuit (ECM 5 V output)

Ignition system

Fuel pump control circuit

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

Crankshaft position sensor

Intake system

Valve timing

No. 1 valve rocker arm sub-assembly*

Engine cranks normally but difficult to start

ECM power source circuit

Flow chart [Engine difficult to start]

Throttle body with motor assembly

Fuel pump assembly (for high pressure side)

Fuel pump (for low pressure side)

Engine coolant temperature sensor

Fuel pump control circuit

Ignition system

Spark plug

Compression

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

Crankshaft position sensor

Intake system

Valve timing

No. 1 valve rocker arm sub-assembly*

Incomplete intermittent combustion occurs (Does not start)

Fuel pump control circuit

Ignition system

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

Crankshaft position sensor

Intake system

Valve timing

High engine speed

Throttle body with motor assembly

ECM power source circuit

PCV hose

 

PCV system

 

Low engine speed (Poor idle)

Fuel pump control circuit

Throttle body with motor assembly

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

Fuel pump assembly (for high pressure side)

PCV hose

PCV system

Intake system

Rough idle

Flow chart [Rough idling]

Throttle body with motor assembly

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

Fuel pump assembly (for high pressure side)

Ignition system

Compression

Fuel pump control circuit

Spark plug

Intake system

Valve timing

No. 1 valve rocker arm sub-assembly*

Hunting (Poor idle)

Throttle body with motor assembly

ECM power source circuit

Fuel pump control circuit

Spark plug

Intake system

 

Drive start control

Hesitation/Poor acceleration (Poor driveability)

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

Fuel pump control circuit

Fuel pump assembly (for high pressure side)

Ignition system

Spark plug

Intake system

Valve timing

No. 1 valve rocker arm sub-assembly*

Brake override system

Drive start control

Lack of power

Flow chart [Lack of power]

Surging (Poor driveability)

Fuel pump control circuit

Spark plug

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

No. 1 valve rocker arm sub-assembly*

Engine stalls soon after starting

Flow chart [Engine stalls]

Fuel pump control circuit

Throttle body with motor assembly

Crankshaft position sensor

Ignition system

Fuel pump assembly (for high pressure side)

Intake system

Valve timing

Engine stalls soon after slow down

Flow chart [Engine stalls]

Fuel injector assembly (for port injection)

Fuel injector assembly (for direct injection)

Throttle body with motor assembly

ECM

Crankshaft position sensor

Ignition system

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.)

-

Drive mode does not change

Drive mode switch circuit

Engine vibrates frequently when idling (Active control engine mount system)

Active control engine mount circuit

HINT:

*: Check "Fuel Cut Elapsed Time" in the Data List. If the elapsed time is over 0 sec, then the engine speed is high (the engine speed at which fuel cut occurs + 500 rpm or more). In this situation, there is a possibility that a No. 1 valve rocker arm sub-assembly will become loose and malfunction, check that the No. 1 valve rocker arm sub-assemblies are properly installed.

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    Precaution

    Readiness Monitor Drive Pattern

    See More:

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    DESCRIPTION There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU (network gateway ECU) is below 54 Ω. Symptom Trouble Area Resistance between terminals 6 (CA3H) and 21 (CA3L) of th ...

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