Dtc P1617 Distance Control Ecu Malfunction

Cruise Control System. Lexus Is250, Is220D. Gse20 Ale20
Cruise Control. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

INSPECTION PROCEDURE

CONFIRM DESIGNATION INFORMATION

CHECK DTC

DTC P1617 Distance Control ECU Malfunction


DESCRIPTION

In the dynamic radar cruise control system, the ECM and the distance control ECU (cruise control ECU) communicate with one another to control the system based on some designation information. If the designation information of the ECM and distance control ECU is different or the distance control ECU is malfunctioning, this DTC is recorded.

DTc No.
DTC Detection Condition
Trouble Area
P1617
While the dynamic radar cruise control is either preparing for operation or operating, if a designation signal from the ECM and a designation return signal from the distance control ECU do not match or the distance control ECU is malfunctioning for more than a specific amount of time, the ECM records this trouble code
  1. Distance control ECU (Cruise control ECU)

INSPECTION PROCEDURE

NOTICE:
When the distance control ECU is replaced with a new one, initialization must be performed (Click here).
1.CONFIRM DESIGNATION INFORMATION

  1. Confirm the designation information.

    1. Turn the engine switch on (IG).

    2. Turn the cruise control main switch on.

    3. With the brake pedal depressed, push the cruise control main switch to + (ACCEL)/RES (RESUME) 3 times within 3 seconds. Check that the skid control buzzer sounds at this time.

      OK:
      The skid control buzzer sounds. (Initialization is performed.)
      NOTICE:
      1. Do not turn the light control switch on at this time because the beam axis automatic adjustment mode has already started, which could lead to incorrect beam axis. If the light control switch is turned on by mistake, readjust the beam axis (refer to page for beam axis adjustment) (Click here).
      2. If initialization cannot be performed, first inspect the stop light switch circuit, cruise main switch circuit, and skid control buzzer circuit.


NG
REPLACE DISTANCE CONTROL ECU
OK


2.CHECK DTC

  1. Clear the DTCs and then recheck for DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B
HINT:
If DTC P1617 is still output after replacing the distance control ECU, replace the ECM.


B
REPLACE DISTANCE CONTROL ECU
A

END