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.

Click here

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.

Click here

Result

Proceed to

CAN communication system DTCs are not output.

A

CAN communication system DTCs are output.

B
B

GO TO CAN COMMUNICATION SYSTEM

A

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
NG

GO TO STEP 4

OK

3.

REPLACE ECU

(a) Turn the ignition switch off.

*a

Front view of DLC3

(b) Replace the ECM.

Click here

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

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

OK

END
NG

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
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

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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU
OK

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

(c) 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

OK

END
NG

REPLACE POWER STEERING ECU ASSEMBLY

    Lost Communication With ECM/PCM "A" (U0100,U0129,U023A)
    DESCRIPTION The power steering ECU assembly receives signals from the ECM and skid control ECU (brake actuator assembly) via CAN communication. DTC No. Detection Item ...

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