Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Lost Communication with Cruise Control Front Distance Range Sensor (U0235)

Toyota Tacoma 2015-2018 Service Manual / Pre-collision / Pre-collision System / Lost Communication with Cruise Control Front Distance Range Sensor (U0235)

DESCRIPTION

The millimeter wave radar sensor assembly is connected to the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 via CAN communication. If communication with the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 stops, the millimeter wave radar sensor assembly stores DTC U0235.

  • *1: for Hydraulic Brake Booster
  • *2: for Vacuum Brake Booster

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0235

Lost Communication with Cruise Control Front Distance Range Sensor

When the ignition switch is ON, a communication error between the millimeter wave radar sensor assembly and skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 is detected for approximately 2 seconds.

  • CAN communication system
  • Vehicle stability control system
  • Millimeter wave radar sensor assembly
  • *1: for Hydraulic Brake Booster
  • *2: for Vacuum Brake Booster

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the millimeter wave radar sensor assembly has been replaced, be sure to perform millimeter wave radar sensor assembly adjustment.

    Click here

  • The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE

1.

CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check for DTCs.

Click here

Result

Proceed to

Vehicle stability control system DTCs are not output

A

Vehicle stability control system DTCs are output

B

B

GO TO VEHICLE STABILITY CONTROL SYSTEM

A

2.

TEST MODE INSPECTION (VEHICLE STABILITY CONTROL SYSTEM)

HINT:

When entering Test Mode (Signal Check), the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 communicates with the millimeter wave radar sensor assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode (Signal Check) within 5 seconds of entering Test Mode (Signal Check).

  • *1: for Hydraulic Brake Booster
  • *2: for Vacuum Brake Booster

(a) Procedure to enter Test Mode

(1) Turn the ignition switch off.

(2) Check that the steering wheel is centered.

(3) Check that the shift lever is in P.

(4) Connect the Techstream to the DLC3.

(5) Turn the ignition switch to ON.

(6) Turn the Techstream on.

(7) Switch the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 to Test Mode (Signal Check) using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.

  • *1: for Hydraulic Brake Booster
  • *2: for Vacuum Brake Booster

HINT:

Do not exit Test Mode (Signal Check) within 5 seconds of entering Test Mode (Signal Check). If Test Mode (Signal Check) is exited within 5 seconds of entering Test Mode (Signal Check), DTC U0235 may be stored. If DTC U0235 is output after exiting Test Mode (Signal Check), enter Test Mode (Signal Check) again, wait at least 5 seconds, then recheck for DTCs.

(8) Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode (Signal Check) pattern.

HINT:

If the ABS warning and slip indicator lights do not blink, inspect the ABS warning and slip indicator light circuits.

(b) End Test Mode (Signal Check)

(1) Turn the ignition switch off to exit mode.

(2) Disconnect the Techstream.

NEXT

3.

CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here (b) Make sure that the DTC detection conditions are met.

(b) Make sure that the DTC detection conditions are met.

HINT:

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

(c) Check for DTCs.

Click here

Result

Proceed to

DTC U0235 is not output

A

DTC U0235 is output

B

A

END

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)
DESCRIPTION These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control. DTC No. Detection Item DTC Detect ...

Front Camera Module Circuit (C1AA0)
DESCRIPTION The millimeter wave radar sensor assembly receives information about the area in front of the vehicle from the forward recognition camera. If the millimeter wave radar sensor assembly ...

Other materials:

Inspection
INSPECTION PROCEDURE 1. REMOVE SPIRAL CABLE SUB-ASSEMBLY WITH SENSOR (a) If there are any defects as mentioned below, replace the spiral cable sub-assembly with a new one: Scratches, cracks, dents or chips on the connector or the spiral cable sub-assembly. (b) Inspect the spiral ca ...

Lost Communication with ECM / PCM (U0100,U0140,U0142,U0155,U1117)
DESCRIPTION These DTCs are stored when there is a CAN communication malfunction between the certification ECU (smart key ECU assembly), ECM, main body ECU (multiplex network body ECU) or combination meter assembly, and data from the option connector (bus buffer ECU) cannot be received. HINT: ...

What to do if...
■ Instrument cluster ■ Center panel ■Warning lights *1: Slip indicator comes on. *2: The indicator flashes to indicate a malfunction. GAS STATION INFORMATION ...

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