Inspection Procedure

NOTE:

When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and write them down before removal.
It is necessary to perform initialization (See INITIALIZATION ) after registration (See REGISTRATION ) of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced.

INSPECT FUSE (ECU-IG NO. 4)

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
ECU-IG No. 4 fuse	Always	Below 1 Ω

NG: Go to step 4

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ECU - BATTERY)

Disconnect the L10 ECU connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
L10-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
L10-1 (IG) - Body ground	Engine switch off	Below 1 V

Fig 1: Identifying L10 (IG) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ECU - BODY GROUND)

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
L10-7 (GND) - Body ground	Always	Below 1 Ω

Fig 2: Identifying L10 (GND) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE TIRE PRESSURE WARNING ECU (See REMOVAL )

CHECK HARNESS AND CONNECTOR (ECU - FUSE)

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

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
L10-1 (IG) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying L10 (IG) Connector Terminals

NG: REPLACE FUSE AND REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE FUSE