DTC    C1A40    ENG / EHV Device

for Preparation Click here


DESCRIPTION

When the driving support ECU assembly receives a hybrid control system or SFI system malfunction signal from the power management control ECU or ECM via the CAN communication line, DTC C1A40 is stored.

DTC No.
DTC Detection Condition
Trouble Area
C1A40
While power switch is on (IG), hybrid control system or SFI system malfunction signal is detected for 1 second
  1. Hybrid control system
  2. Power management control ECU
  3. SFI system
  4. ECM
  5. Driving support ECU assembly

WIRING DIAGRAM


E187973E20


INSPECTION PROCEDURE

1.READ OUTPUT DTC (HYBRID CONTROL SYSTEM)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Powertrain / Hybrid Control / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B



B
GO TO HYBRID CONTROL SYSTEM (Click here)
A


2.READ OUTPUT DTC (SFI SYSTEM)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B



B
GO TO SFI SYSTEM (Click here)
A


3.CHECK WHETHER DTC OUTPUT RECURS (DTC C1A40)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the malfunction cannot be detected.

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC C1A40 is output
    		B



B
Go to step 4
A

USE SIMULATION METHOD TO CHECK (Click here)  

4.REPLACE POWER MANAGEMENT CONTROL ECU

  1. Replace the power management control ECU (Click here).


NEXT


5.CHECK WHETHER DTC OUTPUT RECURS (DTC C1A40)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the malfunction cannot be detected.

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC C1A40 is output
    		B



B
Go to step 6
A

END 

6.REPLACE ECM

  1. Replace the ECM (Click here).


NEXT


7.CHECK WHETHER DTC OUTPUT RECURS (DTC C1A40)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the malfunction cannot be detected.

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC C1A40 is output
    		B



B
REPLACE DRIVING SUPPORT ECU ASSEMBLY (Click here)
A

END