Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) Main Body Ecu Communication Stop Mode

Power Source Network. Yaris. Ncp93, 131
Networking. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

CAN COMMUNICATION SYSTEM (for Hatchback except Separate Type Yaw Rate Sensor) - Main Body ECU Communication Stop Mode


DESCRIPTION


Detection Item
Symptom
Trouble Area
Main Body ECU Communication Stop Mode
Either condition is met:
  1. "Main Body" is not displayed on "Bus Check".
  2. "Main Body ECU Communication Stop Mode" in "DTC Combination Table" applies.
  1. Power source or inside main body ECU (multiplex network body ECU)
  2. Main body ECU (multiplex network body ECU) branch wire or connector
  3. Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) Main Body Ecu Communication Stop Mode


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
  3. Turn the ignition switch off before inspecting CAN bus wires for a ground short.
  4. After the ignition switch is turned off, check that the key reminder warning system are not operating.
  5. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT:
  1. Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  2. Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
1.CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)
Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) Main Body Ecu Communication Stop Mode

  1. Disconnect the D143 main body ECU (multiplex network body ECU) connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D143-14 (CANH) - D143-13 (CANL)
    		Ignition switch off
    		54 to 69 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Main Body ECU (Multiplex Network Body ECU))


NG
REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)
OK


2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

  1. Remove the main body ECU (multiplex network body ECU) (YARIS_NCP93 RM000003TOE00CX.html).


Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) Main Body Ecu Communication Stop Mode


Text in Illustration
*a
Component without harness connected
(Instrument Panel Junction Block Assembly)
-
-

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    MB-11 (GND1) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    MB-30 (BECU) - Body ground
    		Always
    		11 to 14 V
    MB-32 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


3.CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Yaris. Ncp93, 131.Networking.Can Communication System (For Sedan).Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) Main Body Ecu Communication Stop Mode


Text in Illustration
*a
Component without harness connected
(Instrument Panel Junction Block Assembly)
-
-

  1. Disconnect the 3A, 3B and 3C instrument panel junction block assembly connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    MB-11 (GND1) - 3B-8
    		Always
    		Below 1 Ω
    MB-30 (BECU) - 3C-21
    		Always
    		Below 1 Ω
    MB-32 (IG) - 3A-40
    		Always
    		Below 1 Ω
    MB-11 (GND1) or 3B-8 - Body ground
    		Always
    		10 kΩ or higher
    MB-30 (BECU) or 3C-21 - Body ground
    		Always
    		10 kΩ or higher
    MB-32 (IG) or 3A-40 - Body ground
    		Always
    		10 kΩ or higher


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (YARIS_NCP93 RM000003TOE00CX.html)
OK

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