Toyota Tacoma (2015-2018) Service Manual: Tire Pressure Warning Light Circuit
DESCRIPTION
If the tire pressure warning ECU and receiver detects any problems, the tire pressure warning light blinks for 1 minute then illuminates, and tire pressure monitoring is disabled at the same time. At this time, the ECU stores a DTC in memory.
Connecting terminals TC and CG of the DLC3 makes the tire pressure warning light blink to output DTCs. The tire pressure warning ECU and receiver sends the tire pressure warning light illumination request signal to the main body ECU (multiplex network body ECU) via a direct line. The main body ECU (multiplex network body ECU) then sends the signal to the combination meter assembly via CAN communication.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
- It is necessary to perform initialization (See page
.gif)
) after registration (See page
) of the transmitter IDs into the tire
pressure warning ECU and receiver if the ECU has been replaced.
PROCEDURE
|
1. |
CHECK FOR DTC (CAN COMMUNICATION SYSTEM) |
(a) Check if CAN communication system DTCs are output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTCs are not output. |
A |
|
DTCs are output. |
B |
| B | .gif) |
GO TO CAN COMMUNICATION SYSTEM |
|
.gif)
|
2. |
CHECK DTC OUTPUT (B1247) |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON.
(d) Check for DTCs (See page ).
OK:
DTC B1247 is not output.
| NG | |
GO TO DTC (B1247) |
|
|
3. |
CHECK OPERATION OF TIRE PRESSURE WARNING LIGHT (ACTIVETEST) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(f) Check the condition of the tire pressure warning light using the Techstream.
Combination Meter|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Indicat. Tire Pressure Warning System |
Tire pressure warning light |
OFF or ON |
Confirm that the vehicle is stopped with the engine idling. |
OK:
The tire pressure warning light turns on or off in accordance with the Techstream operation.
| OK | |
REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER |
| NG | |
GO TO METER / GAUGE SYSTEM |
TC and CG Terminal Circuit
DESCRIPTION
Tire pressure warning system DTCs can be checked by connecting terminals 13 (TC)
and 4 (CG) of the DLC3. The DTCs are indicated by blinking the tire pressure warning
light.
WIRING DI ...
Tire Position Not Identified
DESCRIPTION
The tire pressure warning ECU and receiver identifies the tire position for each
tire pressure warning valve and transmitter according to the wheel speed signals
from the skid control ...
Other materials:
Reassembly
REASSEMBLY
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for both the LH and RH sides.
The procedure described below is for the LH side.
PROCEDURE
1. INSTALL CLEARANCE LIGHT BULB
(a) Install the clearance light bulb to the clearance light socket.
(b) Turn t ...
Compressor Lock Sensor Circuit (B1422/22)
SYSTEM DESCRIPTION
The ECM sends the engine speed signal to the air conditioning amplifier assembly
via CAN communication.
The air conditioning amplifier assembly reads the difference between compressor
speed and engine speed. When the difference becomes too large, the air conditioning
ampli ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT OIL CLEARANCE
(a) Using a micrometer and caliper gauge, measure the oil seal clearance.
Standard clearance:
0.021 to 0.043 mm (0.0008 to 0.0017 in.)
Maximum clearance:
0.07 mm (0.0028 in.)
If it is greater than the maximum, replace the vane pump assembly.
...
