Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service 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.

Symptom

Suspected Area

See page

No Cool Air Comes Out:

Volume of refrigerant

-

Air conditioner pressure sensor circuit

Air conditioning compressor magnetic clutch circuit

Compressor lock sensor circuit

Evaporator temperature sensor circuit

Air conditioner amplifier assembly

Wire harness or connector

-

No Cool Air Comes Out:

Blower resistor

Blower motor with fan sub-assembly

Air conditioning control assembly

Wire harness or connector

-

No Cool Air Comes Out:

No. 2 air conditioning radiator damper servo sub-assembly (for air mix)

Air conditioning control assembly

Wire harness or connector

-

No Cool Air Comes Out:

Volume of refrigerant

-

Blower motor performance check

-

Air mix damper servo full travel check

-

Recirculation damper servo operation check

-

No Engine Idle-up when A/C Switch ON

Air conditioner amplifier assembly

SFI system (2TR-FE)

SFI system (2GR-FKS)

Wire harness or connector

-

No Warm Air Comes Out:

Blower resistor

Blower motor with fan sub-assembly

Air conditioning control assembly

Wire harness or connector

-

No Warm Air Comes Out:

No. 2 air conditioning radiator damper servo sub-assembly (for air mix)

PTC heater circuit*1

Air conditioning control assembly

Wire harness or connector

-

No Warm Air Comes Out:

Volume of engine coolant

-

Air conditioning control assembly

Blower motor performance check

-

Air mix damper servo full travel check

-

Recirculation damper servo operation check

-

Heater radiator

-

Air Not Coming From Desired Outlets:

Blower resistor

Blower motor with fan sub-assembly

Air conditioning control assembly

Wire harness or connector

-

Air Not Coming From Desired Outlets:

No. 2 air conditioning radiator damper servo sub-assembly (for air mix)

Air conditioning control assembly

Wire harness or connector

-

Windshield Fogging:

Volume of refrigerant

-

Air conditioner pressure sensor circuit

Air conditioning compressor magnetic clutch circuit

Compressor lock sensor circuit

Evaporator temperature sensor circuit

Air conditioner amplifier assembly

Wire harness or connector

-

Windshield Fogging:

Blower resistor

Blower motor with fan sub-assembly

Air conditioning control assembly

Wire harness or connector

-

Windshield Fogging:

No. 2 air conditioning radiator damper servo sub-assembly (for air mix)

Air conditioning control assembly

Wire harness or connector

-

Windshield Fogging:

Volume of refrigerant

-

Blower motor performance check

-

Air mix damper servo full travel check

-

Recirculation damper servo operation check

-

Defrosting Insufficient:

Blower motor with fan sub-assembly

Mode doors: Check cooling, heating & door operation

-

Mode control servo motor: Hot air not coming, Go to no hot air comes out

-

Mode control servo motor: Cold air not coming, Go to no cold air comes out

-

Noise:

Blower motor: Inspect blower motor for debris/cracks

-

Fresh air intake area: Inspect fresh air intake area for debris

-

Noise:

Cooler compressor: Cooler compressor incorrectly fitted

-

Air conditioning compressor magnetic clutch circuit

Refrigerant charge amount

-

Compressor mounting bracket: Compressor mounting bracket incorrectly fitted

-

A/C lines secure & not grounded

-

Odor (Cycle through blower speed, mode, temperature to define odor type when engine is running and A/C switch is ON. (Musty smell, coolant oil smell))

Wet carpet: Inspect water, engine coolant or oil leaks

-

A/C drain tube: Inspect water, engine coolant or oil leaks

-

Fresh air intake area: Inspect water, engine coolant or oil leaks

-

Heater hose: Inspect water, engine coolant or oil leaks

-

Evaporator: Inspect water, engine coolant or oil leaks

-

Evapo case: Inspect water, engine coolant or oil leaks

-

Air Not Coming from Desired Outlets (Cycle the mode lever and check airflow for outlets when engine is running, A/C switch is ON.)

Blower motor with fan sub-assembly

No. 1 air conditioning radiator damper servo sub-assembly (for mode switching)

Mode doors: Check cooling, heating & door operation

-

Wire harness or connector

-

Air conditioning control assembly

The temperature control dial is rotated to the MAX A/C position, but the MAX A/C mode is not activated.

No. 2 air conditioning radiator damper servo sub-assembly (for air mix)

Air conditioning control assembly

Air conditioning amplifier assembly

Wire harness or connector

-

Quick heater assembly does not operate*1

PTC heater circuit

Air conditioning amplifier assembly

ECM (for 2TR-FE)

ECM (for 2GR-FKS)

  • *1: w/ PTC Heater
System Diagram
SYSTEM DIAGRAM ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) Air conditioning system data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seem ...

Other materials:

Operation Check
OPERATION CHECK 1. CHECK WINDOW LOCK SWITCH HINT: Before performing the window lock switch operation check, make sure that the window lock switch is off (the switch is not pushed in). (a) Check that the front passenger and rear windows cannot be operated from each power window regulator swit ...

Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) (C1273,C1274,C1403,C1404)
DESCRIPTION Refer to DTCs C1401 and C1402 (See page ). DTC Code DTC Detection Condition Trouble Area C1273 C1274 Stored only during test mode. Rear speed sensor RH/LH Rear speed sensor rotor RH/LH (rear ax ...

Components
COMPONENTS ILLUSTRATION HINT: The following specifications are for BD20D (w/o Differential Lock). BD20D differentials are equipped with M8 rear differential carrier to rear axel housing fasteners. ILLUSTRATION ILLUSTRATION ...

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