TIRE PRESSURE WARNING SYSTEM > ECU Power Source Circuit

for Preparation Click here


DESCRIPTION

This is the power source for the tire pressure monitor ECU. It also supplies the power to the tire pressure monitor receiver via the ECU.

WIRING DIAGRAM


C107279E01


INSPECTION PROCEDURE

1.INSPECT BATTERY

  1. Check the battery voltage.

    Standard voltage:
    11 to 14 V



NG
REPLACE BATTERY
OK


2.INSPECT FUSE (ECU-IG)


    C107267E01

  1. Remove the ECU-IG fuse from the passenger side J/B.

  1. Check continuity of the ECU-IG fuse.

    Standard:
    Continuity exists.



NG
CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK


3.INSPECT TIRE PRESSURE MONITOR ECU


    C107242E04

  1. Remove the tire pressure monitor ECU with connectors being connected.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    K45-1 (IG) - K45-4 (GND2)
    		10 to 14 V



NG
Go to step 4
OK

REPLACE TIRE PRESSURE MONITOR ECU 

4.CHECK HARNESS AND CONNECTOR (BATTERY - TIRE PRESSURE MONITOR ECU)


    C107245E08

  1. Disconnect the tire pressure monitor ECU K45 connector.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    K45-1 (IG) - Body ground
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - BODY GROUND)


    C107245E09

  1. Disconnect the tire pressure monitor ECU K45 connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    K45-4 (GND2) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TIRE PRESSURE MONITOR ECU