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

Toyota CH-R Service Manual / Power Assist Systems / Power Steering System / TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the ECU to display DTCs by blinking the EPS warning light.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

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HINT:

When the warning 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 for DTCs.

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Result	Proceed to
CAN communication system DTCs are not output.	A
CAN communication system DTCs are output.	B

GO TO CAN COMMUNICATION SYSTEM

2.	INSPECT DLC3

(a) Turn the ignition switch to ON.

*a	Front view of DLC3

(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	9 to 16 V

GO TO STEP 4

3.	REPLACE ECU

(a) Turn the ignition switch off.

*a	Front view of DLC3

(b) Replace the ECM.

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SST: 09843-18040

(d) Check that the EPS warning light is blinking.

OK:

The EPS warning light is 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 the part.

Click here

END

REPLACE POWER STEERING ECU ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM)

(a) Disconnect the A38 ECM connector.

(b) 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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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 the part.

Click here

*a	Front view of DLC3

REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

6.	REPLACE ECU

(a) Replace the ECM.

*a	Front view of DLC3

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

Click here

SST: 09843-18040

OK:

The EPS warning light is 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 the part.

Click here

END

REPLACE POWER STEERING ECU ASSEMBLY

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