TC and CG Terminal Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Wiring Diagram

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NOTE: When replacing the skid control ECU, perform zero point calibration (See CALIBRATION ).

CHECK CAN COMMUNICATION SYSTEM

Check if the CAN communication system DTC is output (See DIAGNOSIS SYSTEM ).

Result

CONDITION CHART

Condition	Proceed to
DTC is not output	A
DTC is output	B

B : INSPECT CAN COMMUNICATION SYSTEM

A : GO TO NEXT STEP

INSPECT DLC3

Turn the engine switch on (IG).

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

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J21-13 (TC) - J21-4 (CG)	Engine switch on (IG)	10 to 14 V

Fig 2: Inspecting DLC3

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OK : Go to step 5

NG : GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM)

Turn the engine switch off.
Disconnect the ECM connector.

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

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J21-13 (TC) - A6-3 (TC)	Always	Below 1 Ω
J21-13 (TC) - Body ground	Always	10 kΩ or higher

Fig 3: Checking Harness And Connector (TC Of DLC3 - ECM)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : GO TO NEXT STEP

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

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

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J21-4 (CG) - Body ground	Always	Below 1 Ω

Fig 4: Checking Harness And Connector (CG Of DLC3 - Body Ground)

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : GO TO NEXT STEP

CHECK ECM (TC of DLC3 INPUT)

Reconnect the ECM connector.
Using the SST, connect terminals TC and CG of the DLC3.
Turn the engine switch on (IG).

Check that the engine warning light is blinking.

Fig 5: Checking ECM (TC Of DLC3 Input)

Result

CONDITION CHART

Condition	Proceed to
Engine warning light is blinking	A
Engine warning light is not blinking	B

HINT:

If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See PROBLEM SYMPTOMS TABLE ).

B : REPAIR OR REPLACE WIRE HARNESS OR ECM (TC of ECM CIRCUIT)

A : REPLACE SKID CONTROL ECU