Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Fuel Sender Open Detected (B1500)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Fuel Sender Open Detected (B1500)

DESCRIPTION

This DTC is stored when the combination meter assembly detects a fuel sender gauge assembly malfunction via a direct line.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1500

Fuel Sender Open Detected

When IG voltage is 9.5 V or more and the following condition is detected:

  • Voltage signal from fuel sender gauge assembly is 0.2 V or less 3 times consecutively
  • Voltage signal from fuel sender gauge assembly is 4.7 V or more 3 times consecutively
  • Harness or connector
  • Fuel suction tube with pump and gauge assembly
  • Fuel sender gauge assembly
  • Combination meter assembly

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-

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.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (FUEL INPUT)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Fuel Input

Fuel input

Min.: 0 L, Max.: 127.5 L

Fuel receiver gauge indicates F: 64.8 L

Fuel receiver gauge indicates 3/4: 54.0 L

Fuel receiver gauge indicates 1/2: 36.0 L

Fuel receiver gauge indicates 1/4: 18.0 L

Fuel receiver gauge indicates E: 7.2 L

Unit: Liter
Body Electrical > Combination Meter > Data List

Tester Display

Fuel Input

Result

Proceed to

Fuel level data can be displayed on the Techstream and DTC B1500 is output.

A

Fuel level data cannot be displayed on the Techstream.

B
A

REPLACE COMBINATION METER ASSEMBLY

B

2.

INSPECT FUEL SENDER GAUGE ASSEMBLY (POWER SOURCE)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

J10-18 (FV) - Body ground

Engine switch on (IG)

4.5 to 5.5 V

*a

Component with harness connected

(Combination Meter Assembly)
NG

REPLACE COMBINATION METER ASSEMBLY

OK

3.

INSPECT FUEL SENDER GAUGE ASSEMBLY

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

J10-27 (FR) - J10-28 (FE)

Engine switch on (IG)

0.3 to 4.6 V

*a

Component with harness connected

(Combination Meter Assembly)
OK

REPLACE COMBINATION METER ASSEMBLY

NG

4.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the S10 fuel suction tube with pump and gauge assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-27 (FR) - S10-3 (S)

Always

Below 1 Ω

J10-28 (FE) - S10-2 (FE)

Always

Below 1 Ω

J10-18 (FV) - S10-1 (FV)

Always

Below 1 Ω

J10-27 (FR) or S10-3 (S) - Body ground

Always

10 kΩ or higher

J10-28 (FE) or S10-2 (FE) - Body ground

Always

10 kΩ or higher

J10-18 (FV) or S10-1 (FV) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT FUEL SENDER GAUGE ASSEMBLY

(a) Remove the fuel sender gauge assembly.

Click here

(b) Inspect the fuel sender gauge assembly.

Click here

OK:

Fuel sender gauge assembly is normal.

NG

REPLACE FUEL SENDER GAUGE ASSEMBLY

OK

6.

INSPECT FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-3 - B-1

Always

Below 1 Ω

A-1 - B-3

Always

Below 1 Ω

A-2 - B-2

Always

Below 1 Ω

*a

Component without harness connected

(Fuel Suction Tube with Pump and Gauge Assembly)
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPLACE FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY

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