Toyota Tundra Service Manual: ECU Power Source Circuit

DESCRIPTION

The IG circuit is the power source for the tire pressure warning ECU and receiver.

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 if 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.

*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:

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

Standard Resistance:

OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR