Toyota Sienna Service Manual: Distance Control ECU Malfunction

DTC P1617 Distance Control ECU Malfunction

DESCRIPTION

In the dynamic laser cruise control system, the ECM and the distance 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

INSPECTION PROCEDURE

NOTICE: When the distance control ECU is replaced with a new one, initialization must be performed

1 CONFIRM DESIGNATION INFORMA

1. Confirm the designation information.

1.  Turn the ignition switch to the ON position.
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:

•  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).
•  If initialization cannot be performed, first inspect the stop light switch circuit, cruise main switch circuit, and skid control buzzer circuit.

2 CHECK DTC

1. Clear the DTCs and then recheck for DTCs.

Result

HINT: If DTC P1617 is still output after replacing the distance control ECU, replace the ECM.

END