U0235

CRUISE CONTROL: DYNAMIC LASER CRUISE CONTROL SYSTEM: U0235: Lost Communication with Cruise Control Front Distance Range Sensor

DTC U0235 - Lost Communication with Cruise Control Front Distance Range Sensor

DESCRIPTION

The laser sensor and distance control ECU (cruise control ECU) transmit the data for general vehicle control and diagnosis function along the communication line. The laser sensor transmits information about the vehicle in front to the distance control ECU (cruise control ECU).






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- When the distance control ECU is replaced with a new one, initialization must be performed. Adjustments
- When the laser sensor is replaced with a new one, adjustment of the laser sensor beam axis must be performed. Adjustments

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - LASER SENSOR)





(a) Disconnect the distance control ECU connector and laser sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK DISTANCE CONTROL ECU





(a) Reconnect the laser sensor connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE DISTANCE CONTROL ECU
OK -- Continue to next step.
3. CHECK LASER SENSOR





(a) Reconnect the laser sensor connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:










(c) Check the signal waveform between terminal LRDD (L1-3) of the laser sensor and body ground.
OK:
A waveform similar to that in the illustration on the left is output.
- Gauge set: 2 V/DIV., 10 ms./DIV.
- Condition: Ignition switch on

NG -- REPLACE LASER SENSOR
OK -- END (INTERMITTENT PROBLEM IS PRESENT)