ECU Power Source Circuit [11/2016 - ]: Procedure

1. Disconnect the M25 tire pressure warning ECU and receiver connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   M25-1 (IG) - Body ground	Ignition switch ON	10.5 to 16 V*1 10 to 16 V*2
   	Ignition switch off	Below 1 V

   ()	*1: w/ Stop and Start System*2: w/o Stop and Start System

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M25-12 (GND) - Body ground	Always	Below 1 Ω

   Result	Proceed to
   OK	A
   NG (w/ Stop and Start System)	B
   NG (w/o Stop and Start System)	C

Result: 

A 

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. 

Refer to  REMOVAL [12/2013 - ] 

Result: 

B 

INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT). 

Refer to  Backup Boost Converter Circuit [11/2016 - ] 

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR