C2179

TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM (for Hatchback): C2179/79: Tire Pressure Monitor ECU Communication Stop
C2179/79 - Tire Pressure Monitor ECU Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* 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 Programming and Relearning after registration Registration (from 07/2011) of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
* When replacing the tire pressure warning ECU and receiver on vehicles equipped with the wireless door lock control system, be sure to perform Registration of Recognition Code to register the transmitter IDs after ECU replacement Registration (from 07/2011).

PROCEDURE

1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER (PRG TERMINAL)

(a) Disconnect the tire pressure warning ECU and receiver J69 connector.

(b) Using an oscilloscope, check waveform.





Text in Illustration





Waveform:





OK:

Waveform alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage.

HINT
The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.

NG -- CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

OK -- REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Removal (from 07/2011)

2. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the tire pressure warning ECU and receiver J69 connector and main body ECU (multiplex network body ECU) D143 connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal (from 07/2011)