Lexus ES manuals

Lexus ES: Vehicle Speed Information Communication Lost (C2178)

Lexus ES (XZ10) Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System (for Hv Model) / Vehicle Speed Information Communication Lost (C2178)

DESCRIPTION

The tire pressure warning ECU and receiver receives signals from the combination meter assembly via CAN communication. If a malfunction occurs in this communication line, DTC C2178 is output.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

C2178

Vehicle Speed Information Communication Lost

Communication between the combination meter assembly and tire pressure warning ECU and receiver is interrupted for 10 seconds or more.
  • Meter / gauge system
  • Tire pressure warning ECU and receiver

-

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
  • It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

1.

INSPECT COMBINATION METER ASSEMBLY (ON-VEHICLE INSPECTION)

(a) Perform On-vehicle Inspection of the meter/gauge system.

Click here

HINT:

Check the meter function by referring to On-vehicle Inspection for the combination meter assembly.

Result

Proceed to

Combination meter assembly is normal

A

Combination meter assembly is malfunctioning

B
A

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

B

GO TO METER / GAUGE SYSTEM

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 Initialization Switch Error (for Test Diagnosis) (C2198)

DESCRIPTION The switch circuit inside the combination meter assembly turns on and off according to the steering pad switch assembly operation. During test mode, the tire pressure warning light blinks

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DESCRIPTION The tire pressure warning ECU and receiver receives signals from the skid control ECU (brake booster with master cylinder assembly) via CAN communication system. DTC No. Detection Ite

SEE MORE:

 Components

COMPONENTS ILLUSTRATION *1 PROPELLER SHAFT HEAT INSULATOR *2 NO. 1 PROPELLER SHAFT HEAT INSULATOR BRACKET SUB-ASSEMBLY *3 REAR ENGINE MOUNTING BRACKET SUB-ASSEMBLY *4 TRANSFER ASSEMBLY Tightening torque for "Major areas involving basic vehicle performance such as moving/tu

 Installation

INSTALLATION CAUTION / NOTICE / HINT for HV Model: When removing or installing the rear disc brake caliper assembly, pushing back the disc brake piston may cause a large clearance between the brake pads and brake disc. When the brake pedal is depressed with a large clearance between the brake pad

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