Diagnosis System

1. CHECK DLC3

(a) The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches ISO 15765-4 format. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace harness and connector.

Symbols (Terminal No.)

Terminal Description

Condition

Specified Condition

SIL (7) - SG (5)

Bus "+" line

During transmission

Pulse generation

CG (4) - Body ground

Chassis ground

Always

Below 1 Q

CG (4) - Body ground

Signal ground

Always

Below 1 Q

BAT (16) - Body ground

Battery positive

Always

11 to 14 V

CANH (6) - CANL (14)

CAN bus line

Ignition switch off

54 to 69 Q

CANH (6) - CG (4)

HIGH-level CAN bus line

Ignition switch off*

200 Q or higher

CANL (14) - CG (4)

LOW-level CAN bus line

Ignition switch off*

200 kQ or higher

CANH (6) - BAT (16)

HIGH-level CAN bus line

Ignition switch off*

6 kQ or higher

CANL (14) - CG (4)

LOW-level CAN bus line

Ignition switch off*

*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. HINT:

If the display shows an error message after having connected the cable of the intelligent tester to the DLC3, turn the ignition switch on (IG), and operated the tester, there is a problem on either the vehicle side or the tool side.

• If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.

• If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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