Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

When replacing the tire pressure warning ECU and receiver, read the IDs stored in the old ECU using the intelligent tester 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 and receiver after the ECU has been replaced.

INSPECT FUSE (ECU-IG1)

Remove the ECU-IG1 fuse from the cowl side junction block LH.

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

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
ECU-IG fuse	Always	Below 1 Ω

NG: GO TO step 3

OK: GO TO next step.

CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)

Disconnect the T25 ECU connector.

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

Standard voltage

STANDARD VOLTAGE REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
T25-1 (IG) - Body ground	Ignition switch ON	10 to 14 V

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
T25-9 (GND) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying T25 ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER (see REPLACEMENT )

CHECK HARNESS AND CONNECTOR (ECU - BODY GROUND)

Disconnect the T25 ECU connector.

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

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
T25-1 (IG) - Body ground	Always	10 kΩ or higher

NG: REPLACE FUSE AND REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying T25 ECU Connector

OK: REPLACE FUSE