P1570

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P1570: Radar Sensor Malfunction
P1570 - Radar Sensor Malfunction

DESCRIPTION

The millimeter wave radar sensor emits radar waves towards an object in front and measures the distance and direction of the object by receiving the wave 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 distance control ECU.





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, or 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 wave 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.

- The vehicle in front is a tall trailer.
- 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 Adjustments.

PROCEDURE

1. ADJUST MILLIMETER WAVE RADAR SENSOR

(a) Refer to the adjustment Adjustments.

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

NEXT -- Continue to next step.

2. CHECK DTC (DYNAMIC RADAR CRUISE CONTROL SYSTEM)

(a) Using the Techstream, enter the following menus: Powertrain / Radar Cruise / Trouble Code.

(b) Clear the DTCs Dynamic Radar Cruise Control System.

(c) Perform the following to make sure the DTC detection conditions are met.

HINT
If the detection conditions are not met, the system cannot detect the malfunction.

(1) Drive the vehicle at a speed of 40 km/h (25 mph) or more.

(2) Turn the cruise control main switch on to set the vehicle-to-vehicle distance control mode to the standby state.

(d) Check for DTCs Dynamic Radar Cruise Control System.

OK:

DTC P1570 is not output.

NG -- REPLACE MILLIMETER WAVE RADAR SENSOR Removal

OK -- END