Toyota Tundra Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of the problem symptom. 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.

Air conditioning system

Symptom

Suspected Area

See page

All functions of the air conditioning system do not operate

IG power source circuit

LIN communication system

Air conditioning control assembly

Air conditioning amplifier

Air Flow Control: No blower operation

Blower motor circuit

LIN communication system

Air conditioning control assembly

Air conditioning amplifier

Air Flow Control: No blower control

Blower motor circuit

LIN communication system

Air conditioning control assembly

Air conditioning amplifier

Air Flow Control: Insufficient air flow

Blower motor circuit

Air conditioning amplifier

Temperature Control: No cool air comes out

Refrigerant volume (for HFC-134a(R134a))

Refrigerant volume (for HFO-1234yf(R1234yf))

Refrigerant pressure (for HFC-134a(R134a))

Refrigerant pressure (for HFO-1234yf(R1234yf))

Pressure switch circuit

Air conditioning compressor magnetic clutch circuit

Compressor lock sensor circuit

Air mix damper control servo motor circuit (for Driver Side)

Air mix damper control servo motor circuit (for Passenger Side)

Evaporator temperature sensor circuit

Room temperature sensor circuit

Ambient temperature sensor circuit

LIN communication system

Expansion valve

Air conditioning control assembly

No. 1 damper servo sub-assembly (air mix servo motor [for driver side])

Air mix servo motor (for passenger side)

Air conditioning harness

-

Air conditioning amplifier

ECM (for 1UR-FE)

ECM (for 3UR-FE)

ECM (for 3UR-FBE)

Temperature Control: No warm air comes out

Air mix damper control servo motor circuit (for Driver Side)

Air mix damper control servo motor circuit (for Passenger Side)

Evaporator temperature sensor circuit

Room temperature sensor circuit

Ambient temperature sensor circuit

No. 1 damper servo sub-assembly (air mix servo motor [for driver side])

Air mix servo motor (for passenger side)

Air conditioning harness

-

Air conditioning amplifier

Temperature Control: Output air is warmer or cooler than the set temperature or response is slow

Refrigerant volume

Refrigerant pressure

Solar sensor circuit (for Driver Side)

Solar sensor circuit (for Passenger Side)

Room temperature sensor circuit

Ambient temperature sensor circuit

Air mix damper control servo motor circuit (for Driver Side)

Air mix damper control serve motor circuit (for Passenger Side)

Cool air bypass servo motor circuit

Radiator unit sub-assembly (for 1UR-FE)

Radiator unit sub-assembly (for 3UR-FE)

Radiator unit sub-assembly (for 3UR-FBE)

Expansion valve

No. 1 damper servo sub-assembly (air mix servo motor [for driver side])

Air mix servo motor (for passenger side)

Cool Air Bypass Servo Motor

Air conditioning harness

-

Air conditioning amplifier

Temperature Control: No temperature control (only Max. cool or Max. warm)

Air mix damper control servo motor circuit (for Driver Side)

Air mix damper control servo motor circuit (for Passenger Side)

Room temperature sensor circuit

Ambient temperature sensor circuit

Evaporator temperature sensor circuit

Solar sensor circuit (for Driver Side)

Solar sensor circuit (for Passenger Side)

Air conditioning control assembly

No. 1 damper servo sub-assembly (air mix servo motor [for driver side])

Air mix servo motor (for passenger side)

Air conditioning harness

-

Air conditioning amplifier

No air inlet control

Air inlet control servo motor circuit

Air inlet servo motor

Air conditioning harness

-

Air conditioning amplifier

No air flow mode control

Air outlet control servo motor circuit

No. 1 damper servo sub-assembly (air outlet servo motor)

Air conditioning harness

-

Air conditioning amplifier

Engine idle up does not occur, or is continuous

Air conditioning compressor magnetic clutch circuit

Compressor lock sensor circuit

LIN communication system

Air conditioning control assembly

Air conditioning amplifier

ECM (for 1UR-FE)

ECM (for 3UR-FE)

ECM (for 3UR-FBE)

Blinking of A/C indicator

Air conditioning amplifier

Unable to control A/C with the steering pad switch

LIN communication system

Air conditioning control assembly

Air conditioning amplifier

Diagnostic trouble codes are not recorded. Set mode is cleared when ignition switch is turned OFF.

Air conditioning amplifier

    Precaution

    System Description

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