Toyota Tacoma manuals

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

DESCRIPTION

The DLC3 circuit enables reading of Diagnostic Trouble Codes (DTCs) with no Techstream by connecting terminals TC and CG of the DLC3 connector.

Stored DTCs are displayed in blinking patterns of the CRUISE MAIN indicator light located on the combination meter.

WIRING DIAGRAM

HINT:

HINT:

When a particular warning light blinks continuously, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in the relevant ECU is suspected.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM)

(a) Disconnect the E21 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D4-13 (TC) - E14-20 (TC)

Always

Below 1 Ω

(c) Reconnect the ECM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

TC (D4-13) - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

DLC3

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

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

CG (D4-4) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

DLC3

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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