CAN Communication System (w/ Smart Key System)

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM (w/ Smart Key System): U0127: Lost Communication with Tire Pressure Monitor Module
U0127 - Lost Communication with Tire Pressure Monitor Module

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

NEXT -- Continue to next step.

2. CHECK FOR OPEN IN CAN BUS WIRE (TIRE PRESSURE MONITOR ECU CAN BRANCH WIRE)

(a) Disconnect the D33 tire pressure monitor ECU connector.

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE TIRE PRESSURE MONITOR ECU CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)
OK -- Continue to next step.

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

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE TIRE PRESSURE MONITOR ECU Removal