Toyota CH-R Service Manual: TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the ECU to display DTCs by blinking the ABS warning and slip indicator lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning.

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HINT:

When the indicator lights continue to blink, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in one or more ECUs is suspected.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

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Result

Proceed to

DTCs are not output.

A

DTCs are output.

B

B

INSPECT CAN COMMUNICATION SYSTEM

A

2.

INSPECT DLC3

(a) Turn the ignition switch to ON.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

F41-13 (TC) - F41-4 (CG)

Ignition switch ON

11 to 14 V

*a

Front view of DLC3

NG

GO TO STEP 4

OK

3.

REPLACE ECM

*a

Front view of DLC3

(a) Turn the ignition switch off.

(b) Replace the ECM.

Click here

(c) Using SST, connect terminals TC and CG of the DLC3.

SST: 09843-18040

(d) Check that the ABS warning, slip indicator and brake hold standby indicator lights are blinking.

OK:

The ABS warning, slip indicator and brake hold standby indicator lights are blinking.

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

Click here

OK

END

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

4.

CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM)

(a) Turn the ignition switch off.

(b) Disconnect the A38 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

F41-13 (TC) - A38-33 (TC)

Always

Below 1 Ω

F41-13 (TC) or A38-33 (TC) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (CG of DLC3 - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

F41-4 (CG) - Body ground

Always

Below 1 Ω

*a

Front view of DLC3

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

REPLACE ECM

*a

Front view of DLC3

(a) Replace the ECM.

Click here

(b) Using SST, connect terminals TC and CG of the DLC3.

SST: 09843-18040

(c) Check that the ABS warning, slip indicator and brake hold standby indicator lights are blinking.

OK:

The ABS warning, slip indicator and brake hold standby indicator lights are blinking.

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

Click here

OK

END

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

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