Toyota Avalon (XX50): Engine Oil Pressure Switch Circuit. Entire Combination Meter does not Operate. Fuel Receiver Gauge Display Malfunction

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

Entire Combination Meter does not Operate

DESCRIPTION

This circuit is the power source circuit for the combination meter assembly. This circuit provides two types of power sources; one is a constant power source, and the other is an IG power source.

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.
• Inspect the fuses of circuits related to this system before performing the following procedure.

PROCEDURE

(a) Disconnect the G16 combination meter assembly connector.

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

Standard Resistance:

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Fuel Receiver Gauge Display Malfunction

DESCRIPTION

FUEL RECEIVER GAUGE OPERATION

(a) OPERATION

The combination meter assembly uses the fuel sender gauge assembly to detect the amount of fuel remaining in the fuel tank assembly. The Hall IC built into the fuel sender gauge assembly changes the output voltage according to the amount of fuel remaining. The combination meter assembly receives fuel injection volume signals from the ECM and detects the voltage output from the fuel sender gauge assembly and operates the fuel receiver gauge.

FUEL RECEIVER GAUGE READING

(a) During normal driving:

As the fuel level in the fuel tank assembly changes when driving on a hill or applying the brakes, the fuel receiver gauge reading is updated according to the fuel injection volume during normal driving. However, as the fuel injection volume measurement has a margin of error, the value is indicated after correction by input values from the fuel sender gauge assembly.

(b) During refueling:

The fuel level in the fuel tank assembly rises rapidly when fuel is added. If the averaging process that is used during normal driving is used in this case, the fuel receiver gauge reading cannot be updated promptly. Therefore, when it is judged that fuel is being added to the vehicle based on the changes in the fuel level, output values from the fuel sender gauge assembly is immediately reflected in the fuel receiver gauge reading. This control is called refueling judgment.

NOTICE:

Add fuel with the engine switch off to ensure safety and to enable refueling judgment so that an appropriate fuel receiver gauge reading will be obtained.

REFUELING JUDGMENT CONDITIONS

(a) Normal judgment condition (When normal refueling method is used)

With the engine switch off, the fuel sender gauge assembly detects a change of 5.0 liters (5.3 US qts, 4.4 Imp. qts) or more in the fuel level.

(b) Other judgment conditions (When other refueling method is used)

Any of the following conditions is met:

• With the vehicle and engine stopped and the engine switch on (IG), the fuel sender gauge assembly detects a change of 5.0 liters (5.3 US qts, 4.4 Imp. qts) or more in the fuel level.
• With the vehicle stopped, the engine switch is on (IG), the fuel sender gauge assembly detects a change of 15.0 liters (15.9 US qts, 13.2 Imp. qts) or more in the fuel level.

PRECAUTION FOR REFUELING

(a) The fuel sender gauge assembly cannot detect changes in the fuel level within certain ranges (around points E and F). Therefore, even if 5.0 liters (5.3 US qts, 4.4 Imp. qts) or more of fuel is added, refueling judgment may not be performed and the fuel receiver gauge reading may not change when fuel level is within such ranges.

(b) The fuel sender gauge reading takes approximately 25 seconds to rise from point E to F. If the vehicle is driven while the fuel sender gauge reading is rising, the fuel sender gauge reading will stop rising. After the fuel sender gauge reading stops rising, normal fuel sender gauge reading operation begins. The fuel sender gauge reading takes approximately 1 minutes per 1 liter (1.1 US qts, 0.9 Imp. qts) to rise while the vehicle is being driven, and takes approximately 8 minutes per 1 liter (1.1 US qts, 0.9 Imp. qts) to rise while the vehicle is stopped.

FORCED RESET OF FUEL RECEIVER GAUGE

When driving at a vehicle speed of 1.8 km/h (1 mph) or more, if the output value from the fuel sender gauge assembly is different from the fuel receiver gauge reading by 15.0 liters (15.9 US qts, 13.2 Imp. qts) or more for approximately 5 minutes, the output value from the fuel sender gauge assembly is immediately reflected in the fuel receiver gauge reading to compensate for a situation when refueling judgment cannot be made.

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.

HINT:

• The fuel level warning light will come on when the fuel level is below 9.1 liter (9.6 US qts, 8.0 Imp. qts).*1
• The fuel level warning light will come on when the fuel level is below 8.3 liter (8.8 US qts, 7.3 Imp. qts).*2
  • *1: for Fuel Tank 60.6 liter (64.0 US qts, 53.3 Imp. qts)
  • *2: for Fuel Tank 55.0 liter (58.1 US qts, 48.4 Imp. qts)

PROCEDURE

(a) Check if SFI system DTCs are output.

B

GO TO SFI SYSTEM

A

(a) Check if electronically controlled brake system DTCs are output.

B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

A

(a) Check if meter / gauge system DTCs are output.

B

GO TO B150013

A

(a) Ask the customer about the problem symptoms.

B

GO TO STEP 8

C

GO TO STEP 10

A

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

OK:

Fuel receiver gauge indication is normal.

NG

REPLACE COMBINATION METER ASSEMBLY

OK

(a) Record the fuel receiver gauge reading.

(b) If the fuel tank assembly is almost full, drain 20 liters (21.1 US qts, 17.6 Imp. qts) or more of fuel. (This is not necessary when the fuel tank assembly is sufficiently below full.)

(c) Disconnect the cable from the negative (-) battery terminal to reset the fuel receiver gauge.

NOTICE:

Make sure that the engine switch is off before disconnecting the cable from the negative (-) battery terminal.

(d) Connect the cable to the negative (-) battery terminal and turn the engine switch on (IG).

(e) Check that the fuel receiver gauge has been reset.

(f) Drive the vehicle at 1.8 km/h (1 mph) or more, then move the shift lever to P and turn the engine switch off.

(g) Add 5.0 liters (5.3 US qts, 4.4 Imp. qts) or more of fuel, turn the engine switch on (IG), and check that the fuel receiver gauge reading increases in proportion to the amount of fuel added.

B

REPLACE COMBINATION METER ASSEMBLY

A

HINT:

Inspect the fuel tank assembly for deformation, foreign matter or an improperly installed fuel receiver gauge, as this may be the cause of the fuel receiver gauge malfunction.

(a) Visually check the fuel tank assembly for any abnormalities.

(b) Check if there is an excessive amount of foreign matter in the fuel tank assembly.

(c) Check the installation condition of the fuel tank assembly and fuel sender gauge assembly.

A

REPLACE COMBINATION METER ASSEMBLY

B

REPLACE FUEL TANK ASSEMBLY

C

CLEAN INSIDE OF FUEL TANK ASSEMBLY

D

INSTALL FUEL TANK ASSEMBLY OR FUEL SENDER GAUGE ASSEMBLY CORRECTLY

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

OK:

Fuel receiver gauge indication is normal.

NG

REPLACE COMBINATION METER ASSEMBLY

OK

(a) Disconnect the cable from the negative (-) battery terminal to reset the fuel receiver gauge.

NOTICE:

Make sure that the engine switch is off before disconnecting the cable from the negative (-) battery terminal.

(b) Connect the cable to the negative (-) battery terminal and turn the engine switch on (IG).

(c) Check if the fuel receiver gauge reading corresponds with the amount of fuel remaining in the fuel tank assembly.

A

END

B

REPLACE COMBINATION METER ASSEMBLY

HINT:

Inspect the fuel tank assembly for deformation, foreign matter or an improperly installed fuel receiver gauge, as this may be the cause of the fuel receiver gauge malfunction.

(a) Visually check the fuel tank assembly for any abnormalities.

(b) Check if there is an excessive amount of foreign matter in the fuel tank assembly.

(c) Check the installation condition of the fuel tank assembly and fuel sender gauge assembly.

A

REPLACE COMBINATION METER ASSEMBLY

B

REPLACE FUEL TANK ASSEMBLY

C

CLEAN INSIDE OF FUEL TANK ASSEMBLY

D

INSTALL FUEL TANK ASSEMBLY OR FUEL SENDER GAUGE ASSEMBLY CORRECTLY