Lexus NX: Fuel Receiver Gauge Display Malfunction
DESCRIPTION
OPERATION
The combination meter assembly uses the fuel injection volume signal from the ECM, fuel sender gauge assembly to detect the amount of fuel remaining in the fuel tank assembly. Each gauge assembly has a variable resistor whose resistance changes according to the amount of fuel remaining. The gauge assemblies receive voltage from the combination meter assembly and change the voltage based on the resistance that changes according to the amount of fuel remaining in the fuel tank assembly. The combination meter assembly receives a fuel injection volume signal from the ECM and detects the voltage between each variable resistor and each resistor in the combination meter 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 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 shift lever position and changes in the fuel level, output values from the fuel sender gauge assembly are immediately reflected in the fuel receiver gauge reading. This control is called refueling judgment.
REFUELING JUDGMENT CONDITIONS
NOTICE:
Add fuel with the power switch off to ensure safety and to enable refueling judgment so that an appropriate fuel receiver gauge reading is obtained. If it is necessary to add fuel with the power switch on (IG), move the shift lever to P or N.
(a) Normal judgment condition (When normal refueling method is used)
With the power 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 power 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 power switch on (READY) and the shift lever in P or N, 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 power switch on (READY) and the shift lever in any driving position, 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
The fuel sender gauge assembly cannot detect changes in fuel level within certain ranges (around points E and F). Therefore, even though 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.
FORCED RESET OF FUEL RECEIVER GAUGE
When driving at 20 km/h (12 mph) or more, if the output values from the fuel sender gauge assembly are different from the fuel receiver gauge reading by 15.0 liters (15.9 US qts, 13.2 Imp. qts) or more for approximately 2 minutes, output values from both gauge assemblies are immediately reflected in the fuel receiver gauge reading to compensate for a situation when refueling judgment cannot be made.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
CAUTION:
Be careful of flames.
NOTICE:
When replacing the combination meter assembly, make sure to replace it with a new one.
PROCEDURE
| 1. | CHECK SYMPTOMS |
(a) Ask the customer about the problem symptoms.
| Result | Proceed to |
|---|---|
| Malfunction occurs when adding fuel (Even after adding fuel, reading does not increase at all or increases very slowly, etc.) | A |
| Malfunction occurs during normal driving (The reading does not change, decreases quickly or decreases when the vehicle is not being driven, etc.) (The problem symptom recurs) | B |
| Malfunction occurs during normal driving (The reading does not change, decreases quickly or decreases when the vehicle is not being driven, etc.) (The problem symptom does not recur) | C |
| B | .gif) | GO TO STEP 10 |
| C | | GO TO STEP 15 |
|
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| 2. | PERFORM ACTIVE TEST USING TECHSTREAM (FUEL METER OPERATION) |
(a) Using the Techstream, perform the Active Test.
Click here .gif)
| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Fuel Meter Operation | Fuel receiver gauge | OFF, Sender E, Empty, Warning, 1/4, 1/2, 3/4, Full or Sender F | - |
| Tester Display |
|---|
| Fuel Meter Operation |
OK:
Fuel receiver gauge indication is normal.
| NG | | REPLACE COMBINATION METER ASSEMBLY |
|
| 3. | CHECK FOR DTC (SFI SYSTEM) |
(a) Check for DTCs.
Click here
OK:
No DTCs are output.
| NG | | GO TO SFI SYSTEM |
|
| 4. | CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Check for DTCs.
Click here
OK:
No DTCs are output.
| NG | | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM |
|
| 5. | CHECK FUEL RECEIVER GAUGE OPERATION BY ADDING FUEL |
(a) Record the fuel receiver gauge reading.
(b) If the fuel tank assembly is almost full, drain 20 liters or more of fuel. (This is not necessary when the fuel tank assembly is sufficiently below full.)
(c) Disconnect the cable from the negative (-) auxiliary battery terminal to reset the fuel receiver gauge.
HINT:
Check that the power switch is turned off before disconnecting the cable from the negative (-) auxiliary battery terminal.
(d) Connect the cable to the negative (-) auxiliary battery terminal and turn the power switch on (IG).
(e) Check that the fuel receiver gauge has been reset.
(f) Drive the vehicle at 1.75 km/h (1.09 mph) or more, then move the shift lever to P and turn the power switch off.
(g) Add 5.0 liters or more of fuel, turn the power switch on (IG), and check that the fuel receiver gauge reading increases in proportion to the amount of fuel added.
| Result | Proceed to |
|---|---|
| Fuel receiver gauge reading increases in proportion to the amount of fuel added | A |
| Fuel receiver gauge reading does not change even when fuel is added | B |
| B | | GO TO STEP 7 |
|
| 6. | INSPECT FUEL TANK 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 a 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.
| Result | Proceed to |
|---|---|
| Normal | A |
| Appearance of the fuel tank assembly is abnormal. | B |
| There is an excessive amount of foreign matter in the fuel tank assembly. | C |
| The fuel tank assembly or fuel sender gauge assembly is not installed correctly. | D |
| B | | REPLACE FUEL TANK ASSEMBLY |
| C | | CLEAN INSIDE OF FUEL TANK ASSEMBLY |
| D | | INSTALL FUEL TANK ASSEMBLY OR FUEL SENDER GAUGE ASSEMBLY CORRECTLY |
|
| 7. | READ VALUE USING TECHSTREAM (FUEL INPUT) |
(a) Using the Techstream, read the Data List.
Click here
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Fuel Input | Fuel input | Min.: 0, Max.: 127.5 | Current fuel level displayed | Unit: Liter |
| Tester Display |
|---|
| Fuel Input |
OK:
Fuel level data displayed on the Techstream is almost the same as the fuel receiver gauge indication.
| NG | | REPLACE COMBINATION METER ASSEMBLY |
|
| 8. | INSPECT FUEL SENDER GAUGE ASSEMBLY |
(a) Remove the fuel sender gauge assembly.
Click here
(b) Inspect the fuel sender gauge assembly.
Click here
| NG | | REPLACE FUEL SENDER GAUGE ASSEMBLY |
|
| 9. | CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - FUEL SENDER GAUGE ASSEMBLY AND BODY GROUND) |
(a) Disconnect the I10 combination meter assembly connector.
(b) Disconnect the b2 fuel sender gauge assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I10-27 (FR) - b2-1 (FS) | Always | Below 1 Ω |
| I10-28 (FE) - b2-2 (FE) | Always | Below 1 Ω |
| I10-31 (ES) - Body ground | Always | Below 1 Ω |
| I10-27 (FR) or b2-1 (FS) - Body ground | Always | 10 kΩ or higher |
| I10-28 (FE) or b2-2 (FE) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE COMBINATION METER ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 10. | PERFORM ACTIVE TEST USING TECHSTREAM (FUEL METER OPERATION) |
(a) Using the Techstream, perform the Active Test.
Click here
| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Fuel Meter Operation | Fuel receiver gauge | OFF, Sender E, Empty, Warning, 1/4, 1/2, 3/4, Full or Sender F | - |
| Tester Display |
|---|
| Fuel Meter Operation |
OK:
Fuel receiver gauge indication is normal.
| NG | | REPLACE COMBINATION METER ASSEMBLY |
|
| 11. | CHECK FOR DTC (SFI SYSTEM) |
(a) Check for DTCs.
Click here
OK:
No DTCs are output.
| NG | | GO TO SFI SYSTEM |
|
| 12. | CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Check for DTCs.
Click here
OK:
No DTCs are output.
| NG | | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM |
|
| 13. | CHECK FOR DTC |
(a) Recheck for DTCs and check that no DTCs are output.
Click here
OK:
No DTCs are output.
| NG | | GO TO DTC B1500 |
|
| 14. | INSPECT FUEL RECEIVER GAUGE |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal to reset the fuel receiver gauge.
HINT:
Check that the power switch is turned off before disconnecting the cable from the negative (-) auxiliary battery terminal.
(b) Connect the cable to the negative (-) auxiliary battery terminal and turn the power switch on (IG).
(c) Check if the fuel receiver gauge reading corresponds with the amount of fuel remaining in the fuel tank assembly.
| Result | Proceed to |
|---|---|
| Fuel receiver gauge reading corresponds with the amount of fuel remaining in the fuel tank assembly. | A |
| Fuel receiver gauge reading does not correspond with the amount of fuel remaining in the fuel tank assembly. | B |
| A | | END |
| B | | GO TO STEP 7 |
| 15. | CHECK FOR DTC (SFI SYSTEM) |
(a) Check for DTCs.
Click here
OK:
No DTCs are output.
| NG | | GO TO SFI SYSTEM |
|
| 16. | CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Check for DTCs.
Click here
OK:
No DTCs are output.
| NG | | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM |
|
| 17. | INSPECT FUEL TANK 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 a 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.
| Result | Proceed to |
|---|---|
| Normal | A |
| Appearance of the fuel tank assembly is abnormal. | B |
| There is an excessive amount of foreign matter in the fuel tank assembly. | C |
| The fuel tank assembly, fuel sender gauge assembly is not installed correctly. | D |
| 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 |
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Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The following procedure is for the LH side.
NOTICE:
Because the RH side flexible hose and LH side flexible hose are not interchangeable, verify the part number when installing the rear flexible hose
