DTC 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.

DTC Code	DTC Detection Condition	Trouble Area
P1570	The ECM detects a radar sensor malfunction signal for 0.15 seconds. or more while the 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, 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 ().

1.ADJUST MILLIMETER WAVE RADAR SENSOR

Refer to the adjustment ().

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

2.CHECK DTC (DYNAMIC RADAR CRUISE CONTROL SYSTEM)

Using the intelligent tester, enter the following menus: Powertrain / Radar Cruise / Trouble Code.

Clear the DTCs ().

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.

Drive the vehicle at a speed of 50 km/h (30 mph) or more.

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

Check for DTCs ().

OK:
DTC P1570 is not output.

NG

REPLACE MILLIMETER WAVE RADAR SENSOR ()

OK

END

CRUISE CONTROL

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

DYNAMIC RADAR CRUISE CONTROL SYSTEM