Toyota Tundra (2015 year). Manual — part 2272
SYMPTOM
SUSPECTED AREA
SEE
PAGE
Ambient temperature sensor circuit
Evaporator temperature sensor circuit
Air conditioning control assembly
No. 1 damper servo sub-assembly (air
mix servo motor)
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)
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 Manual Air...
Last Modified: 9-16-2014
6.6 U
Doc ID: RM000002VX600TX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual 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 Manual Air...
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFIED
CONDITION
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
(b) Using an oscilloscope, check waveform 1.
Compressor lock signal
TERMINAL NO. (SYMBOLS)
TOOL SETTING
CONDITION
J19-8 (LOCK) - J19-14
(GND)
200 mV/DIV., 10
ms./DIV.
Engine is
running
Blower switch
LO
A/C switch ON
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air...
(c) Using an oscilloscope, check waveform 2.
Blower motor control signal
TERMINAL NO. (SYMBOLS)
TOOL SETTING
CONDITION
J19-23 (BLW) - J19-14
(GND)
1 V/DIV., 500
µsec./DIV.
Ignition switch
ON
Blower switch LO
HINT:
When the blower level is increased, the duty ratio changes
accordingly.
(d) Using an oscilloscope, check waveform 3.
CAN communication signal
TERMINAL NO. (SYMBOLS)
TOOL SETTING
CONDITION
J19-11 (CANH) - J19-14
(GND)
1 V/DIV., 10
µsec./DIV.
Ignition switch
ON
HINT:
The waveform varies depending on the CAN communication
signal.
(e) Using an oscilloscope, check waveform 4.
CAN communication signal
TERMINAL NO. (SYMBOLS)
TOOL SETTING
CONDITION
J19-12 (CANL) - J19-14
(GND)
1 V/DIV., 10
µsec./DIV.
Ignition switch
ON
HINT:
The waveform varies depending on the CAN communication
signal.
2. CHECK AIR CONDITIONING CONTROL ASSEMBLY
(a) Disconnect the J127 air conditioning control assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air...
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