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DTC P1712 ENGINE TORQUE CONTROL SIGNAL #2 CIRCUIT MALFUNCTION

DTC P1712 ENGINE TORQUE CONTROL SIGNAL #2 CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:


• Two consecutive driving cycles with fault

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:

Excessive shift shock

Important

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


WIRING DIAGRAM:


CHECK INPUT SIGNAL FOR ECM.

Turn the ignition switch to ON.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 18 (+) — Chassis ground (−):

Is the voltage more than 4.5 V?

Yes


No


CHECK INPUT SIGNAL FOR ECM.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 18 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes

Repair the battery short circuit in harness between ECM and TCM connector.


No


CHECK POOR CONTACT.

Check poor contact in ECM connector.

Is there poor contact in ECM connector?

Yes

Repair the poor contact in ECM connector.


No

Replace the ECM.


CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connectors from ECM and TCM.

Measure the resistance of harness between ECM and TCM connector.

Connector & terminal

(B134) No. 18 — (B56) No. 4:

Is the resistance less than 1 Ω?

Yes


No

Repair the open circuit in harness between ECM and TCM connector.


CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.

Measure the resistance of harness between ECM and chassis ground.

Connector & terminal

(B134) No. 18 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair the ground short circuit in harness between ECM and TCM connector.


CHECK POOR CONTACT.

Check poor contact in TCM connector.

Is there poor contact in TCM connector?

Yes

Repair the poor contact in TCM connector.


No

Replace the TCM.