DTC P0703 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT

/ 9-2X (9346) / 2005 / 2. Engine / ENGINE (DIAGNOSTICS), 2.0T / Diagnostic Procedure with Diagnostic Trouble Code (DTC) / Fault diagnosis, fault codes / DTC P0703 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT

DTC DETECTING CONDITION:

•

Two consecutive driving cycles with fault

•

GENERAL DESCRIPTION

Important
After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

CHECK OPERATION OF BRAKE LIGHT.

Does the brake light come on when depressing the brake pedal?

Yes

Repair or replace the brake light circuit.

CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.

Disconnect the connectors from TCM and brake light switch.

Measure the resistance of harness between TCM and brake light switch connector.

Connector & terminal

(B55) No. 12 — (B65) No. 3:

Is the resistance less than 1 Ω?

Yes

•

Repair or replace the harness and connector.

•

Note
In this case, repair the following:
•	Open circuit in harness between TCM and brake light switch connector
•	Poor contact in TCM connector
•	Poor contact in brake light switch connector

CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.

Measure the resistance of harness between TCM and chassis ground.

Connector & terminal

(B55) No. 12 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes

Repair the ground short circuit in harness between TCM and brake light switch connector.

CHECK INPUT SIGNAL FOR TCM.

Connect the connectors to TCM and brake light switch.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 12 (+) — Chassis ground (−):

Is the voltage less than 1 V when releasing the brake pedal?

Yes

Adjust or replace the brake light switch.

CHECK INPUT SIGNAL FOR TCM.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 12 (+) — Chassis ground (−):

Is the voltage more than 10 V when depressing the brake pedal?

Yes

Adjust or replace the brake light switch.

CHECK POOR CONTACT.

Check poor contact in TCM connector.

Is there poor contact in TCM connector?

Yes

Repair the poor contact in TCM connector.

Replace the TCM.

DTC P0703 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT

CHECK OPERATION OF BRAKE LIGHT.

Does the brake light come on when depressing the brake pedal?

CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.

Is the resistance less than 1 Ω?

CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.

Is the resistance more than 1 MΩ?

CHECK INPUT SIGNAL FOR TCM.

Is the voltage less than 1 V when releasing the brake pedal?

CHECK INPUT SIGNAL FOR TCM.

Is the voltage more than 10 V when depressing the brake pedal?

CHECK POOR CONTACT.

Is there poor contact in TCM connector?

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