NHTSA ID Number: 10143936
Manufacturer Communication Number: T-SB-0063-18
TSB/Document Date: 2018-08-20
Summary
TSB: Some 2016 ? 2018 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 100F. Follow the Repair Procedure in the bulletin to address this condition.
Figure 20.
B. Remove the two screws.
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
© 2018 Toyota
Motor Sales, USA
2
T-SB-0063-18
July 19, 2018
Page 12 of 63
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
16. Remove the RH instrument side panel by
disengaging the four claws, three clips, and
three guides.
Figure 21.
17. Remove the glove box compartment plate
by disengaging the five clips.
Figure 22.
18. Remove the lower No. 2 instrument panel
airbag assembly.
Figure 23.
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
© 2018 Toyota Motor Sales, USA
Protective Tape
T-SB-0063-18
July 19, 2018
Page 13 of 63
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.
19. Remove the instrument lower panel
assembly by removing the five screws.
Figure 24.
20. Remove the passenger side foot air duct by
removing the screw.
Figure 25.
© 2018 Toyota Motor Sales, USA
T-SB-0063-18
July 19, 2018
Page 14 of 63
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
21. Route the battery+ and pusher fan sub-wire harnesses from the relay block attached in
step 11 through the engine compartment.
Figure 26.
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
Grom met
I
J
A/C ECU Pigtail
K
TSB-Added Relay Block
L
M
Battery (+) Sub-Wire Harness
N
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 27.
F
B
A
C
G
E
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 Com partment
E
A/C ECU Sub-Wire Harness
© 2018 Toyota Motor Sales, USA
T-SB-0063-18
July 19, 2018
Page 15 of 63
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.
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.
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.
Figure 28.
1
2
1
A/C ECU Pigtail & Driver J/B
Sub-Wire Harnesses
2
Engine Room Relay Block Bracket Bolt
Figure 29.
© 2018 Toyota Motor Sales, USA
T-SB-0063-18
July 19, 2018
Page 16 of 63
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 30.
1
2
F. Unscrew the nut from the stud bolt on
the positive battery cable.
G. Put the ring terminal from the NEW
sub-wire harness (white) onto the stud
bolt flange side up.
H. Tighten the nut.
1
Vehicle Battery+ Cable
2
Battery+ Sub-Wire Harness
Figure 31.
Torque: 9.8 – 15.7 N*m
(103 – 159 kgf*cm, 7.5 – 11.5 ft*lbf)
© 2018 Toyota Motor Sales, USA
T-SB-0063-18
July 19, 2018
Page 17 of 63
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.
(2) Reinstall the ground terminal into
the original position.
Torque: 7 – 9.8 N*m
(71 – 100 kgf*cm, 5 – 7.2 ft*lbf)
Figure 32.
1
2
1
Tie Bands
2
Negative (–) Battery Cable
Figure 33.
1
2
1
Engine Room Harness Ground Terminal
2
Sub-Wire Harness Ground Ring Terminal
© 2018 Toyota Motor Sales, USA
T-SB-0063-18
July 19, 2018
Page 18 of 63
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 34. Battery
1
1
1
Tie Bands
Figure 35. Radiator
1
1
© 2018 Toyota Motor Sales, USA
Tie Bands
T-SB-0063-18
July 19, 2018
Page 19 of 63
Lack of A/C Performance at Idle in High Ambient Temperature
Procedure (continued)
L. Remove the radiator support frame seal
by removing the seven clips and the
frame seal.
Figure 36.
M. Continue to route the pusher fan
sub-wire harness over the top driver
side of the radiator, attach it to the
engine room harness at the marked
locations with tie bands, and cut off
the excess.
Figure 37. Radiator (Driver Side)
1
1
© 2018 Toyota Motor Sales, USA
Tie Bands
T-SB-0063-18
July 19, 2018
Page 20 of 63
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
N. Route the pusher fan sub-wire harness
through the top front of the radiator.
Figure 38.
O. Attach the pusher fan sub-wire harness
to the bottom of the hood latch with a tie
band and cut off the excess.
P. Connect the sub-wire harness pusher
fan connector to the NEW pusher
fan included.
1
2
22. The A/C ECU pigtail and driver J/B sub-wire
harnesses from the engine compartment
will be routed into the passenger
compartment through the engine
compartment bulk head grommet located
next to the power brake booster.
1
Tie Band
2
Sub-Wire Harness Pusher Fan Connector
Figure 39.
© 2018 Toyota Motor Sales, USA
T-SB-0063-18
July 19, 2018
Page 21 of 63
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
23. The A/C ECU pigtail and driver J/B sub-wire
harnesses will be routed into the passenger
compartment through the bottom of the
grommet that will require modification.
Figure 40.
1
1
Sub-Wire Harness Grommet Passage
24. Modify the bulk head grommet by using scissors or equivalent and cut off the rubber end
of the passage at the indent mark to expose the passage through to the
passenger compartment.
Figure 41.
Figure 42.
1
1
2
1
Grom met Indent Mark
1
Cut at Grommet Indent Mark
2
Modified Grommet
© 2018 Toyota Motor Sales, USA
T-SB-0063-18
July 19, 2018
Page 22 of 63
Lack of A/C Performance at Idle in High Ambient Temperature
Repair Procedure (continued)
25. Confirm the orientation of the grommet
passage is between the 6 and 8 o’clock
position, viewing it from the engine
compartment side.
If the grommet is NOT in this orientation,
rotate the bulk head grommet so the
passage is in the proper orientation.
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TSB/Document ID: T-SB-0063-18
Replacement Service Bulletin Number:
MFR Communication Date: 2018-07-19
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:APPLIANCE:AIR CONDITIONER
MFR Component System:
MFR Component Subsystem:
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