AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > Diagnostic Procedure without Diagnostic Trouble Code (DTC) > CHECK POWER MODE SWITCH

AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > Diagnostic Procedure without Diagnostic Trouble Code (DTC)

CHECK POWER MODE SWITCH

DIAGNOSIS:

• The light does not illuminate when power switch is ON.

• Power switch circuit is open or shorted.

TROUBLE SYMPTOM:

No power mode occurs.

WIRING DIAGRAM:

• LHD model

• RHD model

STEP	CHECK	YES	NO
1.CHECK POWER SWITCH OPERATION.	When the power switch is turned to OFF, does the light illuminate?
2.CHECK POWER SWITCH OPERATION.	When the power switch is turned to ON, does the light illuminate?	Go to step CHECK HOLD SWITCH.
3.CHECK POWER INDICATOR LIGHT. 1) Turn the ignition switch to OFF. 2) Remove the combination meter. 3) Remove the power indicator light bulb from combination meter.	Is the power indicator light bulb OK?		Replace the power indicator light bulb.
4.CHECK POWER SWITCH GROUND CIRCUIT. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from power switch. 3) Measure the resistance of harness connector between power switch and chassis ground. Connector & terminal LHD model (R92) No. 4 — Chassis ground: RHD model (B133) No. 4 — Chassis ground:	Is the resistance less than 1 Ω?		Repair the open circuit of harness between power switch and chassis ground.
5.CHECK POWER SWITCH. 1) Turn the power switch to ON. 2) Measure the resistance between power switch terminals. Terminal No. 5 — No. 4:	Is the resistance less than 1 Ω?		Replace the power switch.
6.CHECK POWER SWITCH. 1) Turn the power switch to OFF. 2) Measure the resistance between power switch terminals. Terminal No. 5 — No. 4:	Is the resistance 1 MΩ or more?		Replace the power switch.
7.CHECK HARNESS CONNECTOR BETWEEN TCM AND POWER SWITCH. Measure the resistance of harness connector between TCM and power switch. Connector & terminal LHD model (B54) No. 9 — (R92) No. 5: RHD model (B54) No. 9 — (B133) No. 5:	Is the resistance less than 1 Ω?		Repair the open circuit of harness between TCM and power switch connector.
8.CHECK HARNESS CONNECTOR BETWEEN TCM AND POWER SWITCH. Measure the resistance of the harness connector between TCM connector and chassis ground. Connector & terminal (B54) No. 9 — Chassis ground:	Is the resistance 1 MΩ or more?		Repair the short circuit of harness between TCM and power switch connector.
9.CHECK INPUT SIGNAL FOR TCM. 1) Connect the connector to TCM and power switch. 2) Turn the ignition switch to ON. (engine OFF) 3) Measure the signal voltage for TCM while the power switch is OFF. Connector & terminal (B54) No. 9 (+) — Chassis ground (−):	Is the voltage 10 V or more?		Replace the TCM.
10.CHECK INPUT SIGNAL FOR TCM. Measure the signal voltage for TCM while the power switch is ON. Connector & terminal (B54) No. 9 (+) — Chassis ground (−):	Is the voltage less than 1 V?		Replace the TCM.
11.CHECK POOR CONTACT.	Is there poor contact?	Repair the poor contact.	A temporary poor contact of the power switch circuit connector or harness may be the cause.