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.

DIAGNOSTIC TROUBLE CODE CHART

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	Distance control ECU (Cruise control ECU)

NOTE: When the distance control ECU is replaced with a new one, initialization must be performed (see REMOVAL ).

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.)
    NOTE:
    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 example for beam axis ADJUSTMENT ) .
    
    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 : Go To Next Step

CHECK DTC

Clear the DTCs and then recheck for DTCs.

Result

RESULT REFERENCE

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