Toyota Tundra Service Manual: Tire Pressure Monitor Receiver Communication Stop (B1247)

DESCRIPTION

The main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver are connected using 2 direct lines that they use to communicate with each other.

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 after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

HINT:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

(a) Disconnect the P21 tire pressure warning ECU and receiver connector.

(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition P21-12 (GND) - Body ground Always Below 1 Ω

*a Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Replace the tire pressure warning ECU and receiver.

Click here

NEXT

(a) Clear the DTCs.

Click here

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON.

(d) Check for DTCs.

Click here

OK:

DTC B1247 is not output.

OK

END

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)