Toyota Tacoma 2015-2018 Service Manual: TC and CG Terminal Circuit

Toyota Tacoma 2015-2018 Service Manual / Supplemental Restraint Systems / Airbag System / TC and CG Terminal Circuit

DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.

The DTCs are displayed by blinking the SRS warning light.

HINT:

Make sure that DTCs which relate to the CAN communication system are not output. If any of these DTCs are output, check the CAN communication system (See page ).
The DTC output mode signal is transmitted through the CAN to an ECU including the airbag sensor assembly. Thus if no systems enter DTC output mode, the ECM may have a malfunction.
When a warning light keeps blinking, a short to ground in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (DLC3 - ECM)

Text in Illustration

for 2GR-FKS

for 2TR-FE

DLC3

Front view of wire harness connector

(to ECM)

(a) Turn the ignition switch off.

(b) Disconnect the connector from the ECM.

Standard Resistance:

for 2GR-FKS

Tester Connection	Condition	Specified Condition
D4-13 (TC) - E14-20 (TC)	Always	Below 1 Ω

for 2TR-FE

Tester Connection	Condition	Specified Condition
D4-13 (TC) - E21-19 (TC)	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS, ECU OR CONNECTOR

2.	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
D4-4 (CG) - Body ground	Always	Below 1 Ω

Text in Illustration

DLC3

REPAIR OR REPLACE HARNESS, ECU OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (TC CIRCUIT OF ECM)

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

Standard Resistance:

for 2GR-FKS

Tester Connection	Condition	Specified Condition
E14-20 (TC) - Body ground	Always	1 MΩ or higher

for 2TR-FE

Tester Connection	Condition	Specified Condition
E21-19 (TC) - Body ground	Always	1 MΩ or higher

REPAIR OR REPLACE HARNESS, ECU OR CONNECTOR

CHECK DTC

SST: 09843-18040

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

NOTICE:

Connect the terminals to the correct positions to avoid a malfunction.

Text in Illustration

DLC3

Result

Result	Proceed to
DTC output mode is set in each ECU.	A
DTC output mode is not set in ECM. (for 2GR-FKS)	B
DTC output mode is not set in ECM. (for 2TR-FE)	C
DTC output mode is not set in airbag sensor assembly.	D

USE SIMULATION METHOD TO CHECK

REPLACE ECM

REPLACE AIRBAG SENSOR ASSEMBLY

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