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 |
|---|---|---|
|
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 |
|
.gif)
- *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:
Outside Vehicle
General Maintenance
GENERAL MAINTENANCE
CAUTION / NOTICE / HINT
Performing these maintenance checks on the vehicle is the owner's responsibility.
The owner may perform the maintenance or take the vehicle to a service center.
Check the parts of the vehicle described below on a daily basis ...
Steering Pad Switch Circuit
DESCRIPTION
This circuit sends an operation signal from the steering pad switch assembly
to the radio and display receiver assembly.
If there is an open in the circuit, the audio system cannot be operated using
the steering pad switch assembly.
If there is a short in the circuit, the same con ...
Theft Deterrent System is not Unset when Engine is Running
DESCRIPTION
The theft deterrent system is unset when the IG signal and engine speed signal
are input to the main body ECU (multiplex network body ECU) for 2 seconds or more
continuously.
The engine speed signal is sent from the ECM to the main body ECU (multiplex
network body ECU). For this ...