Dtc C2179/79 Tire Pressure Monitor Ecu Communication Stop

Suspension. Yaris. Ncp93, 131
Tire Pressure Monitoring. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER (PRG TERMINAL)

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

DTC 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.

DTC No.
DTC Detection Condition
Trouble Area
C2179/79
Communication between the main body ECU (multiplex network body ECU) and tire pressure warning ECU is interrupted for 10 seconds or more.
  1. Main body ECU (Multiplex network body ECU)
  2. Wire harness or connector
  3. Tire pressure warning ECU

WIRING DIAGRAM


Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan). Dtc C2179/79 Tire Pressure Monitor Ecu Communication Stop


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and write them down before removal.
  2. It is necessary to perform initialization (YARIS_NCP93 RM000000XMZ073X.html) after registration (YARIS_NCP93 RM000000XN107WX.html) of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
  3. 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 (YARIS_NCP93 RM0000023D302UX.html).
1.CHECK TIRE PRESSURE WARNING ECU AND RECEIVER (PRG TERMINAL)

  1. Disconnect the tire pressure warning ECU and receiver J69 connector.



    Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan). Dtc C2179/79 Tire Pressure Monitor Ecu Communication Stop

  1. Using an oscilloscope, check waveform.

    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Tire Pressure Warning ECU and Receiver)
    *b
    		Example
    *c
    		GND
    Waveform:
    Item
    		Contents
    Terminal
    		J69-5 (PRG) - J69-12 (GND)
    Tool setting
    		5 V/DIV, 500 μs./DIV.
    Vehicle condition
    		Ignition switch ON
    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
Go to step 2
OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER (YARIS_NCP93 RM000004VV4001X.html)

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

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J69-5 (PRG) - D143-4 (PRG)
    		Always
    		Below 1 Ω
    J69-5 (PRG) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (YARIS_NCP93 RM000003TOE00CX.html)