DTC    P1570    Radar Sensor Malfunction

for Preparation Click here


DESCRIPTION

The millimeter wave radar sensor emits radar beams towards an object in front and measures the distance and direction of the object by receiving the beam reflections. Based on the reflections, the sensor calculates the difference in speed between your own vehicle and an object in front. This data is transmitted to the cruise control ECU (distance control ECU).

DTC No.
DTC Detection Condition
Trouble Area
P1570
ECM detects radar sensor malfunction signal for 0.15 sec. or more while dynamic radar cruise control is in operation
Millimeter wave radar sensor

HINT:
The millimeter wave radar sensor monitors the millimeter wave circuit activation by itself. This DTC is output when one of the following occurs: 1) the monitor is malfunctioning, 2) an EEPROM error is detected, 3) a voltage error is detected, and 4) the radar sensor is not adjusted. When raindrops or snowflakes strike the millimeter wave radar sensor face, the distance between the vehicle in front and your own vehicle cannot be measured correctly. The dynamic radar cruise control system functions by detecting the beam reflections from the vehicle directly in front. In the following cases, the system may not be able to detect the vehicle in front and may not properly maintain the correct vehicle-to-vehicle distance.
  1. The vehicle in front is a tall trailer.
  2. Exhaust emissions from the vehicle in front or from other lanes are heavy.


INSPECTION PROCEDURE

NOTICE:
When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (Click here).

1.ADJUST MILLIMETER WAVE RADAR SENSOR
Refer to adjustment (Click here).

HINT:
It is necessary to make the ECM recognize specification information (whether the vehicle is equipped with the dynamic radar or not). If this procedure has not been carried out, this DTC may be output.

  1. Clear the DTC and then recheck for DTCs.

    OK:
    DTC is not output



NG
REPLACE MILLIMETER WAVE RADAR SENSOR
OK

SYSTEM OK