Toyota Tundra (2015 year). Manual — part 2246
SYMPTOM
SUSPECTED AREA
SEE
PAGE
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
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
SYMPTOM
SUSPECTED AREA
SEE
PAGE
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)
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
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
Last Modified: 9-16-2014
6.6 U
Doc ID: RM000002VX600UX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): TERMINALS
OF ECU; 2015 MY Tundra [08/2014 - ]
TERMINALS OF ECU
1. CHECK AIR CONDITIONING AMPLIFIER
(a) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
(SYMBOLS)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFIED
CONDITION
J19-1 (IG+) -
J19-14 (GND)
P - W-B
Ignition power supply
Ignition switch ON
11 to 14 V
Ignition switch OFF
Below 1 V
J19-21 (B) - J19-14
(GND)
BR - W-B
Battery power source
Always
11 to 14 V
J19-14 (GND) -
Body ground
W-B - Body
ground
Ground
Always
Below 1 Ω
J19-5 (TAM) -
J19-14 (GND)
V - W-B
Ambient temperature sensor
signal
Ignition switch ON at 25°C
(77°F)
1.35 to 1.75 V
Ignition switch ON at 40°C
(104°F)
0.9 to 1.2 V
J19-8 (LOCK) -
J19-14 (GND)
SB - W-B
Compressor lock sensor
signal
Engine is running
Blower switch LO
A/C switch ON
Pulse generation
(see waveform
1)
J19-23 (BLW) -
J19-14 (GND)
LG - W-B
Blower motor control signal
Ignition switch ON
Blower switch LO
Pulse generation
(see waveform
2)
J19-20 (MGC) -
J19-14 (GND)
P - W-B
Compressor magnetic clutch
operation signal
Engine is running
Blower switch LO
A/C switch OFF
11 to 14 V
Engine is running
Blower switch LO
A/C switch ON
Below 1 V
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFIED
CONDITION
J19-33 (TSD) -
J19-14 (GND)
P - W-B
Driver side solar sensor
signal
Ignition switch ON
Solar sensor subjected to
electric light
0.8 to 4.3 V
J19-32 (TSP) -
J19-14 (GND)
L - W-B
Passenger side solar sensor
signal
Ignition switch ON
Solar sensor subjected to
electric light
0.8 to 4.3 V
J19-29 (TR) -
J19-34 (SG-1)
G - B
Room temperature sensor
signal
Ignition switch ON
Front side interior
temperature: 25°C (77°F)
1.8 to 2.2 V
J19-34 (SG-1) -
Body ground
B - Body
ground
Ground for room
temperature sensor
Always
Below 1 Ω
J19-13 (SG-2) -
Body ground
G - Body
ground
Ground for ambient
temperature sensor
Always
Below 1 Ω
J19-37 (LIN1) -
J19-14 (GND)
SB - W-B
LIN communication signal
Ignition switch ON
Pulse generation
J19-11 (CANH) -
J19-14 (GND)
B - W-B
Hi-level CAN bus line
Ignition switch ON
Pulse generation
(see waveform
3)
J19-12 (CANL) -
J19-14 (GND)
W - W-B
Lo-level CAN bus line
Ignition switch ON
Pulse generation
(see waveform
4)
z1-2 (BUS G) - Body
ground
-
Ground for BUS IC
Always
Below 2 V
z1-3 (BUS) - z1-2
(BUS G)
-
BUS IC control signal
Ignition switch OFF → ON
Pulse generation
z1-4 (B BUS) - z1-2
(BUS G)
-
Power supply for BUS IC
Always
11 to 14 V
z1-5 (SGA) - Body
ground
-
Ground for No. 1 cooler
thermistor
Always
Below 2 V
z1-6 (TEA) - z1-5
(SGA)
-
No. 1 cooler thermistor
signal
Ignition switch ON
No. 1 cooler thermistor at
0°C (32°F)
1.7 to 2.1 V
Ignition switch ON
No. 1 cooler thermistor at
15°C (59°F)
0.7 to 1.3 V
If the result is not as specified, the ECU may have a malfunction.
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
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