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

DTC P1817 SPORT MODE SWITCH CIRCUIT

DTC DETECTING CONDITION:

Input signal circuit of SPORT shift switch is shorted.

TROUBLE SYMPTOM:

• Manual mode can not be set.

• The ATF temperature warning light does not illuminate.

• No SPORT mode occurs.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK SPORT SHIFT SWITCH GROUND CIRCUIT.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the SPORT shift switch.

3) Measure the resistance of harness between SPORT shift switch connector and chassis ground.

Connector & terminal

(B117) No. 8 — Chassis ground:

Is the resistance less than 1 Ω?

Repair the open circuit of harness between the SPORT shift switch and chassis ground.

2.CHECK SPORT SHIFT SWITCH.

Measure the resistance between SPORT shift switch terminals.

Connector & terminal

(B117) No. 7 — No. 8:

Is the resistance 1 MΩ or more?

Replace the select lever assembly.

3.CHECK SPORT SHIFT SWITCH.

1) Shift the select lever to SPORT mode.

2) Measure the resistance between SPORT shift switch terminals.

Connector & terminal

(B117) No. 7 — No. 8:

Is the resistance less than 1 Ω?

Replace the select lever assembly.

4.CHECK HARNESS CONNECTOR BETWEEN TCM AND SPORT SHIFT SWITCH.

1) Disconnect the connector from TCM.

2) Measure the resistance of harness between TCM connector and SPORT shift switch connector.

Connector & terminal

(B117) No. 7 — (B54) No. 17:

Is the resistance less than 1 Ω?

Repair the open circuit of harness between SPORT shift switch connector and TCM connector, or poor contact of connector.

5.CHECK HARNESS CONNECTOR BETWEEN TCM AND SPORT SHIFT SWITCH.

1) Disconnect the connector from TCM.

2) Measure the resistance of harness between SPORT shift switch connector and chassis ground.

Connector & terminal

(B117) No. 7 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair the short circuit of harness between SPORT shift switch connector and TCM connector.

6.CHECK INPUT SIGNAL FOR TCM.

1) Connect the connector to TCM and SPORT shift switch.

2) Turn the ignition switch to ON.

3) Shift the select lever to normal mode.

4) Measure the voltage of signal to TCM.

Connector & terminal

(B54) No. 17 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Replace the TCM.

7.CHECK POOR CONTACT.

Is there poor contact of the SPORT shift switch circuit?

Repair the poor contact.

Replace the TCM.