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.
Air Conditioning System

Symptom

Suspected Area

See page

All functions of the air conditioning system do not operate

IG power source circuit

Back-up power source circuit

Air conditioning control panel circuit

Air conditioning amplifier assembly

Air flow control: No blower operation

Blower motor circuit

Air conditioning control panel circuit

Air conditioning amplifier assembly

Air flow control: No blower control

Blower motor circuit

Air conditioning control panel circuit

Air conditioning amplifier assembly

Air flow control: Insufficient air flow

Blower motor circuit

Air conditioning amplifier assembly

Temperature control: No cool air comes out

Refrigerant volume

-

Refrigerant pressure

-

Air conditioning pressure sensor circuit

Air conditioning compressor magnetic clutch circuit

Compressor lock sensor circuit

Air mix damper position sensor circuit (for driver side)

Air mix damper position sensor circuit (for front passenger side)

Air mix damper control servo motor circuit (for driver side)

Air mix damper control servo motor circuit (for front passenger side)

Evaporator temperature sensor circuit

Room temperature sensor circuit

Ambient temperature sensor circuit

Cooler expansion valve

Air conditioning control panel circuit

Air conditioning amplifier assembly

ECM

Temperature control: No warm air comes out

Air mix damper position sensor circuit (for driver side)

Air mix damper position sensor circuit (for front passenger side)

Air mix damper control servo motor circuit (for driver side)

Air mix damper control servo motor circuit (for front passenger side)

Evaporator temperature sensor circuit

Room temperature sensor circuit

Ambient temperature sensor circuit

PTC heater circuit*1

Air conditioning control panel circuit

Air conditioning amplifier assembly

ECM

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

Refrigerant volume

-

Refrigerant pressure

-

Air conditioning compressor magnetic clutch circuit

Compressor lock sensor circuit

Automatic light control sensor circuit

Room temperature sensor circuit

Ambient temperature sensor circuit

Air mix damper position sensor circuit (for driver side)

Air mix damper position sensor circuit (for front passenger side)

Air mix damper control servo motor circuit (for driver side)

Air mix damper control servo motor circuit (for front passenger side)

Air inlet damper position sensor circuit

Air inlet damper control servo motor circuit

PTC heater circuit*1

Heater radiator unit sub-assembly

Cooler expansion valve

Air conditioning control panel circuit

Air conditioning amplifier assembly

ECM

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

Air mix damper position sensor circuit (for driver side)

Air mix damper position sensor circuit (for front passenger side)

Air mix damper control servo motor circuit (for driver side)

Air mix damper control servo motor circuit (for front passenger side)

Room temperature sensor circuit

Ambient temperature sensor circuit

Evaporator temperature sensor circuit

Automatic light control sensor circuit

Air conditioning control panel circuit

Air conditioning amplifier assembly

Temperature control: Output air temperature is different between left and right registers (the set temperature is the same for both)

Refrigerant volume

-

Refrigerant pressure

-

Air mix damper position sensor circuit (for driver side)

Air mix damper position sensor circuit (for front passenger side)

Air mix damper control servo motor circuit (for driver side)

Air mix damper control servo motor circuit (for front passenger side)

Automatic light control sensor circuit

Air conditioning amplifier assembly

No air inlet control

Air inlet damper position sensor circuit

Air inlet damper control servo motor circuit

Air conditioning control panel circuit

Air conditioning amplifier assembly

No air flow mode control

Air outlet damper position sensor circuit

Air outlet damper control servo motor circuit

Air conditioning control panel circuit

Air conditioning amplifier assembly

Quick heater assembly does not operate*1

PTC heater circuit

Air conditioning amplifier assembly

ECM

Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when ignition switch is off

Back-up power source circuit

Air conditioning amplifier assembly

  • *1: w/ PTC Heater
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 ...

Terminals Of Ecu
TERMINALS OF ECU 1. AIR CONDITIONING AMPLIFIER ASSEMBLY HINT: Check from the rear of the connector while it is connected to the air conditioning amplifier assembly. Terminal No. ...

Other materials:

Pressure Sensor Circuit (B1423)
DESCRIPTION This DTC is stored if refrigerant pressure on the high pressure side is extremely low (176 kPa (1.8 kgf/cm2, 26 psi) or less) or extremely high (3140 kPa (32.0 kgf/cm2, 455 psi) or more). The air conditioner pressure sensor, which is installed on the pipe on the high pressure side ...

System Description
SYSTEM DESCRIPTION 1. LIN COMMUNICATION SYSTEM DESCRIPTION The LIN communication system is used for communication between the components in the tables below. If communication cannot be performed through LIN communication because of an open in the communication lines or other reasons, the maste ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) The power window control system data can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs. 2. CHECK DLC3 (a) Check the DLC3 (See page ...

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