Toyota CH-R Service Manual: Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

When troubleshooting a vehicle with a diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the skid control ECU (brake actuator assembly).

The skid control ECU (brake actuator assembly) records DTCs when it detects a malfunction in itself or in its circuits.

To check for DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream can be used to clear the DTCs, activate various actuators, and check the Freeze Frame Data and Data List.

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge the battery before proceeding to the next step.

(b) Check the DLC3.

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DIAGNOSIS

(a) If a malfunction occurs in one part of the system, the skid control ECU (brake actuator assembly) illuminates the warning light corresponding to the malfunctioning system (ABS warning light, brake system warning light (red indicator) or slip indicator light) or blinks the brake hold operated indicator light.

(b) DTCs are simultaneously stored in memory. The DTCs can be read by connecting SST between terminals TC and CG of the DLC3 and observing the blinking pattern of the ABS warning and slip indicator lights, or by connecting the Techstream.

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(c) This system has a Test Mode (signal check) function.

The DTCs can be read by connecting SST between terminals TS and CG of the DLC3 and observing the blinking pattern of the ABS warning and slip indicator lights, or by connecting the Techstream.

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WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

(a) When the ignition switch is turned to ON, check that the ABS warning light, brake system warning light (red indicator), VSC OFF indicator light, multi-information display (TRAC OFF message) brake hold standby indicator light, brake hold operated indicator light and slip indicator light come on for approximately 3 seconds.

HINT:

  • When the brake fluid level is low, the brake system warning light (red indicator) comes on.
  • If a light does not illuminate, check the communication line between the combination meter assembly and skid control ECU (brake actuator assembly).
  • If the ABS warning light or slip indicator light remains illuminated after approximately 3 seconds or the brake hold operated indicator light blinks, check for DTCs and check the corresponding code. If no DTC is output, check the communication line between the combination meter assembly and skid control ECU (brake actuator assembly).

Trouble Area

See Procedure

ABS warning light circuit (Remains on)

ABS warning light circuit (Does not come on)

Brake system warning light (red indicator) circuit (Remains on)

Brake system warning light (red indicator) circuit (Does not come on)

TRAC OFF indicator light circuit (Remains on)

TRAC OFF indicator light circuit (Does not come on)

VSC OFF indicator light circuit (Remains on)

VSC OFF indicator light circuit (Does not come on)

Slip indicator light circuit (Remains on)

Slip indicator light circuit (Does not come on)

Brake hold standby indicator light circuit

Brake hold operated indicator light circuit

    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE If there are no DTCs output and the problem still occurs, check the suspected areas for each problem symptom in the order given in the following table and proceed to the re ...

    Terminals Of Ecu
    TERMINALS OF ECU TERMINALS OF ECU *a Component without harness connected (Skid Control ECU (Brake Actuator Assembly)) - - Termin ...

    Other materials:

    Toyota CH-R Service Manual > Meter / Gauge System: Entire Combination Meter does not Operate
    DESCRIPTION This circuit is the power source circuit for the combination meter assembly. This circuit provides two types of power sources; one is a constant power source, and the other is an IG power source. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses of circu ...

    Toyota CH-R Service Manual > Safety Connect System: Ignition Switch Signal Malfunction (B15C6)
    DESCRIPTION If vehicle movement (10 km/h (6 mph) or more for 10 seconds) is detected based on the location data sent from the radio receiver assembly even when the telematics transceiver detects that the ignition switch is off, this DTC will be stored. DTC No. Detection I ...

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