Toyota CH-R Service 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 various vehicle information signals 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 light
    2. Engine oil pressure warning buzzer
    3. Engine oil pressure warning message on multi-information display

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The following troubleshooting procedure is based on the assumption that the ECM is normal. Confirm that the SFI system is not malfunctioning before performing the following procedure.
    • w/ Canister Pump Module:

      Click here

    • w/o Canister Pump Module:

      Click here

  • 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.

PROCEDURE

1.

INSPECT ENGINE OIL PRESSURE SWITCH ASSEMBLY

(a) Remove the engine oil pressure switch assembly.

Click here

(b) Inspect the engine oil pressure switch assembly.

Click here

NG

REPLACE ENGINE OIL PRESSURE SWITCH ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (ENGINE OIL PRESSURE SWITCH ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the F4 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F4-9 (S) - C28-1

Always

Below 1 Ω

F4-9 (S) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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