Lexus ES manuals

Lexus ES: ENG / EHV Device (C1A40)

DESCRIPTION

When a SFI system malfunction signal sent by the ECM is detected by the clearance warning ECU assembly, DTC C1A40 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1A40

ENG / EHV Device

When the engine switch on (IG), a SFI system malfunction signal is detected for 1 second or more.

  • SFI system
  • Clearance warning ECU assembly

CAUTION / NOTICE / HINT

NOTICE:

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • After replacing an ultrasonic sensor or the clearance warning ECU assembly, perform the necessary procedures (adjustment, calibration, initialization or registration).

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PROCEDURE

1.

CHECK DTC OUTPUT

(a) Using the Techstream, check for DTCs according to the prompts on the screen.

HINT:

After turning the engine switch from off to on (IG), wait 4 seconds or more before checking for DTCs.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

(b) Clear the DTCs according to the screen on the Techstream.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs

(c) Recheck for DTCs.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

HINT:

  • DTC C1A40 is stored when a malfunction signal sent from the EFI system is detected.
  • If the malfunctioning part has been repaired or replaced before rechecking for DTCs, DTC C1A40 will not be output again.
  • If DTC C1A40 is output frequently, duplicate the conditions that cause the problem symptoms and perform troubleshooting again, even though the DTC was not output when rechecking for DTCs.

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Result

Proceed to

DTC C1A40 is output

A

DTC C1A40 is not output

B

A

GO TO EFI SYSTEM (for Gasoline Model) or GO TO HYBRID CONTROL SYSTEM (for HV Model)

B

USE SIMULATION METHOD TO CHECK

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 Diagnosis System

DIAGNOSIS SYSTEM DESCRIPTION When troubleshooting OBD II (On-Board Diagnostics) vehicles, the Techstream (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle's ECM (Engine Control Module) can be then read. OBD II regulations re

 Operation Check

OPERATION CHECK REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY) SELF CHECK NOTICE: Before entering self-diagnostic mode, make sure there are no obstructions which may interfere with operation of the remote touch screen, and that the remote touch screen is not dirty. Do not touch the remote

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