DTC    C2311    Communication Error from HV ECU

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DESCRIPTION

The transmission control ECU assembly receives a P position switch signal from the power management control ECU (HV CPU) and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. The transmission control ECU assembly stores this DTC when it detects a communication error between the power management control ECU (HV CPU) and the transmission control ECU assembly.

DTC No.
DTC Detection Condition
Trouble Area
C2311
With the power switch on (IG) (IG circuit malfunction is not detected), a signal cannot be received from the power management control ECU (open or short in the PCON terminal circuit) or a pulse signal malfunction is received from the power management control ECU for 2 seconds or more.
  1. Transmission control ECU assembly
  2. Power management control ECU
  3. Wire harness or connector

WIRING DIAGRAM


C223025E05


INSPECTION PROCEDURE

1.CHECK TRANSMISSION CONTROL ECU ASSEMBLY

  1. Turn the power switch on (IG).



    C236208E01

  1. Connect an oscilloscope between the transmission control ECU assembly terminals specified in the table below, and measure the waveform.
    Item
    		Contents
    Symbols
    		A22-22 (PCON) - A22-1 (E1)
    Tool setting
    		10 V/DIV., 10 msec./DIV.
    Vehicle condition
    		Power switch on (IG)

    OK:
    The waveform is similar to that shown in the illustration.

    Text in Illustration 
    *a
    		Component with harness connected
    (Transmission Control ECU Assembly)
    *b
    		Waveform

    HINT:
    Perform this inspection with the connector connected.

  1. Turn the power switch off.



NG
Go to step 2
OK

REPLACE TRANSMISSION CONTROL ECU ASSEMBLY (Click here)  

2.CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect connector A22 from the transmission control ECU assembly.

  1. Disconnect connector A20 from the power management control ECU.



    C210344E05

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    A22-22 (PCON) - A20-22 (PCON)
    		Power switch off
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    A22-22 (PCON) or A20-22 (PCON) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Transmission Control ECU Assembly)
    *b
    		Rear view of wire harness connector
    (to Power Management Control ECU)

  1. Connect the power management control ECU connector.

  1. Connect the transmission control ECU assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)