AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1718 CAN COMMUNICATION CIRCUIT

AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P1718 CAN COMMUNICATION CIRCUIT

DTC DETECTING CONDITION:

Input signal circuit of TCM is open or shorted.

WIRING DIAGRAM:

• LHD model

• RHD model

STEP	CHECK	YES	NO
1.CHECK HARNESS CONNECTOR BETWEEN TCM AND VCCCM OR ABSCM&H/U. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from TCM, ECM, VDCCM or ABSCM&H/U. 3) Measure the resistance of the harness between TCM, VDCCM and ABSCM&H/U connector. Connector & terminal Model with VDC (B55) No. 17 — (B310) No. 81: Model without VDC LHD (B55) No. 17 — (B301) No. 11: RHD (B55) No. 17 — (F49) No. 11:	Is the resistance less than 1 Ω?		Repair open circuit of the harness between the TCM and the VDCCM, or the poor contact in the connector.
2.CHECK HARNESS CONNECTOR BETWEEN TCM AND VCCCM OR ABSCM&H/U. Measure the resistance of the harness between TCM, VDCCM and ABSCM&H/U connector. Connector & terminal Model with VDC (B55) No. 18 — (B310) No. 83: Model without VDC LHD (B55) No. 18 — (B301) No. 26: RHD (B55) No. 18 — (F49) No. 26:	Is the resistance less than 1 Ω?		Repair open circuit of the harness between the TCM and the VDCCM, or the poor contact in the connector.
3.CHECK HARNESS CONNECTOR BETWEEN TCM AND ECM. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from TCM and ECM. 3) Measure the resistance of harness between TCM and ECM connector. Connector & terminal 2.0 L model (B55) No. 17 — (B135) No. 2: 2.5 L model (B55) No. 17 — (B136) No. 35:	Is the resistance less than 1 Ω?		Repair the open circuit of harness between TCM and ECM or repair the poor connection of connectors.
4.CHECK HARNESS CONNECTOR BETWEEN TCM AND ECM. Measure the resistance of harness between TCM and ECM connector. Connector & terminal 2.0 L model (B55) No. 18 — (B135) No. 1: 2.5 L model (B55) No. 18 — (B136) No. 27:	Is the resistance less than 1 Ω?		Repair the open circuit of harness between TCM and ECM or repair the poor connection of connectors.
5.CHECK HARNESS CONNECTOR BETWEEN TCM, ECM AND VDCCM OR ABSCM&H/U. Measure the resistance of the harness between TCM and chassis ground. Connector & terminal (B55) No. 17 — Chassis ground: (B55) No. 18 — Chassis ground:	Is the resistance 1 MΩ or more?	It is possible that the TCM, ECM, VDCCM or ABSCM&H/U are defected (replace and recheck).	Repair the short circuit of the harness between TCM, ECM, VDCCM and ABSCM&H/U.