Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Engine Oil Pressure Switch Circuit

DESCRIPTION

The combination meter assembly and engine oil pressure switch assembly are connected via direct line. The combination meter assembly determines the engine oil pressure based on the engine oil pressure switch ON/OFF signal.

HINT:

• The combination meter assembly receives engine RPM data signal from the ECM via CAN communication in order to output warnings.
• The combination meter assembly operates the following to output oil pressure warnings:
  1. Engine oil pressure warning buzzer
  2. Engine oil pressure warning message on multi-information display

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
• The following troubleshooting procedure is based on the assumption that the SFI system is normal. Confirm that the SFI system is not malfunctioning before performing the following procedure.

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PROCEDURE

(a) Inspect the engine oil pressure switch assembly.

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NG

REPLACE ENGINE OIL PRESSURE SWITCH ASSEMBLY

OK

(a) Disconnect the G16 combination meter assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR