NHTSA ID Number: 10187260
Manufacturer Communication Number: T-SB-0093-20 Rev
TSB/Document Date: 2021-02-16
Summary
TSB: Some 2016 ? 2021 model year Tacoma vehicles may exhibit a condition where the air conditioning system shuts down and stops blowing cool air during periods of extended engine idle with ambient temperatures greater than 100°F. Follow the Repair Procedure in the bulletin to address this condition.
Rev1
September 22, 2020
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
11. Remove the left-hand and right-hand
front door scuff plates by disengaging
the 10 claws and two guides.
Figure 10.
12. Remove the left-hand and right-hand
cowl side trim board.
Figure 11.
A. Remove the clip.
B. Disengage the two clips and guide to
remove the cowl side trim board.
Figure 12.
HINT
Repeat the same removal process for the
right-hand side.
Draft - Confidential
© 2021 Toyota
Motor Sales, USA
Page 9 of 62
T-SB-0093-20
Rev1
September 22, 2020
Page 10 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
13. Disconnect the hood lock control lever
sub-assembly by disengaging the claw and
three guides.
Figure 13.
14. Remove the instrument panel lower finish
panel sub-assembly.
A. Remove the bolt.
B. Remove the two screws.
Figure 14.
C. Disengage the 11 clips and four claws.
D. Disconnect the connectors and remove
the instrument panel lower finish panel
sub-assembly.
2
1
1
2
Screw
Clip
Claw
Draft - Confidential
© 2021 Toyota Motor Sales, USA
2
T-SB-0093-20
Rev1
September 22, 2020
Page 11 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
15. Remove the right-hand instrument side
panel by disengaging the four claws, three
clips, and three guides.
Figure 15.
16. Remove the glove box compartment plate
by disengaging the five clips.
Figure 16.
17. Remove the lower No. 2 instrument panel
airbag assembly.
Figure 17.
CAUTION
• Wait AT LEAST 90 seconds AFTER the
ignition switch is turned to the LOCK
position and the negative (–) terminal
cable is disconnected from the battery.
• The SRS is equipped with a backup
power source, so if work is started
within 90 seconds AFTER
disconnecting the negative (–) terminal
cable of the battery, the SRS
may be deployed.
A. Remove the three bolts.
B. Use a screwdriver with its tip wrapped in
protective tape to release the airbag
protector lock.
1
1
Draft - Confidential
© 2021 Toyota Motor Sales, USA
Protective Tape
T-SB-0093-20
Rev1
September 22, 2020
Page 12 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
C. Disconnect the airbag connector and remove the No. 2 instrument panel airbag assembly.
NOTICE
When handling the airbag connector, take care not to damage the wire harness.
18. Remove the instrument lower panel
assembly by removing the five screws.
Figure 18.
19. Remove the passenger side foot air duct by
removing the screw.
Figure 19.
Draft - Confidential
© 2021 Toyota Motor Sales, USA
T-SB-0093-20
Rev1
September 22, 2020
Page 13 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
20. Route the battery+ and pusher fan sub-wire harnesses from the relay block attached in
step 10 through the engine compartment.
Figure 20.
1
2
3
4
1
Engine Room Sub-wire Harness
2
Pusher Fan Sub-wire Harness
3
Battery+ Sub-wire Harness
4
Relay Block
5
A/C ECU Pigtail and Driver J/B
Sub-wire Harness
6
A/C ECU Sub-wire Harness
7
Passenger Compartment Sub-wire Harness
F
Driver J/B
G
Driver J/B Sub-wire Harness
H
Grommet
I
J
K
TSB-Added Relay Block
L
Engine Room Relay Block
M
Battery (+) Sub-wire Harness
N
Battery
O
Pusher Fan Sub-wire Harness
P
Q
TSB Pusher Fan
R
Front
S
Driver Side
T
Rear
U
Passenger Side
5
7
6
Figure 21.
F
B
A
G
E
C
H
D
I
J
T
G
K
S
U
R
L
M
N
O
P
Q
A
A/C ECU
B
Passenger Compartment
C
Evaporator Case
D
Engine Compartment
E
A/C ECU Sub-wire Harness
Draft - Confidential
© 2021 Toyota Motor Sales, USA
T-SB-0093-20
Rev1
September 22, 2020
Page 14 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
A. Remove the bolt from the engine room
relay block bracket and route the NEW
sub-wire harness behind the bracket.
Figure 22.
1
B. Loop and bring the NEW A/C ECU
pigtail and driver J/B sub-wire
harnesses back behind the bracket,
which will later be routed into the
passenger compartment.
2
C. Apply a tie band at the marked location
on the sub-wire harness, attach it to the
engine room relay block bracket, and
cut off the excess.
D. Reinstall the engine room relay block
bracket bolt.
Draft - Confidential
1
A/C ECU Pigtail and Driver J/B
Sub-wire Harnesses
2
Engine Room Relay Block Bracket Bolt
Figure 23.
© 2021 Toyota Motor Sales, USA
T-SB-0093-20
Rev1
September 22, 2020
Page 15 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
E. Route the battery+ sub-wire harness
between the engine room relay block
and the battery.
Figure 24.
1
2
F. Unscrew the nut from the stud bolt on
the positive battery cable.
1
Vehicle Battery+ Cable
2
Battery+ Sub-wire Harness
Figure 25.
G. Put the ring terminal from the NEW
sub-wire harness (white) onto the stud
bolt flange side up.
H. Tighten the nut.
Torque: 9.8 – 15.7 N*m
(103 – 159 kgf*cm, 7.5 – 11.5 ft*lbf)
Draft - Confidential
© 2021 Toyota Motor Sales, USA
T-SB-0093-20
Rev1
September 22, 2020
Page 16 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
I.
Apply tie bands at the marked locations
on the NEW sub-wire harness, attach it
to the bottom side of the negative (–)
battery cable between the engine room
relay block and the battery, and cut off
the excess.
J. Remove the ground terminal from the
engine room harness.
(1) Attach the ring terminal from the
NEW sub-wire harness white wire.
Figure 26.
1
2
1
Tie Bands
2
Negative (–) Battery Cable
Figure 27.
1
(2) Reinstall the ground terminal into
the original position.
Torque: 7 – 9.8 N*m
(71 – 100 kgf*cm, 5 – 7.2 ft*lbf)
Draft - Confidential
2
1
Engine Room Harness Ground Terminal
2
Sub-wire Harness Ground Ring Terminal
© 2021 Toyota Motor Sales, USA
T-SB-0093-20
Rev1
September 22, 2020
Page 17 of 62
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
K. Continue to route the pusher fan
sub-wire harness forward along the side
of the battery and up the side of the
radiator, attach it to the engine room
harness at the marked locations with tie
bands, and cut off the excess.
Figure 28. Battery
1
1
1
Tie Bands
Figure 29. Radiator
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TSB/Document ID: T-SB-0093-20 Rev
Replacement Service Bulletin Number:
MFR Communication Date: 2021-01-12
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:PRESSURE/TEMPERATURE SENSOR
MFR Component System:
MFR Component Subsystem:
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