RL V6-3.7L (2009)
Fuel Gauge Sender: Testing and Inspection
Fuel Gauge Sending Unit Test
Fuel Gauge Sending Unit Test
NOTE: For the fuel gauge system circuit diagram, refer to the Gauges Circuit Diagram.
1. Do multiplex integrated control system troubleshooting test mode A. See: Powertrain Management/Computers and Control Systems/Information
Bus/Testing and Inspection/Component Tests and General Diagnostics/Troubleshooting - B-CAN System Diagnosis Test Mode A
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If no problem is found, go to step 2.
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If DTC B1175 is indicated, go to the DTC B1175 troubleshooting. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures/B Code Charts/B1175
2. Check the No. 21 METER (10 A) fuse in the driver's under-dash fuse/relay box.
3. Do the gauge drive circuit check. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/How to Troubleshoot the Gauges
and Indicators
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If the fuel gauge needle sweeps from the minimum to maximum position and then returns to minimum, the gauge is OK. Go to step 4.
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If the fuel gauge needle does not sweep correctly, replace the gauge control module and retest.
4. Turn the ignition switch to LOCK (0).
5. Remove the rear seat cushion. See: Body and Frame/Seats/Seat Cover/Service and Repair/Rear Seat Cushion Cover Replacement
6. Remove the access panel (A) from the left side of the floor.
7. Disconnect the fuel pump 5P connector (B).
8. Remove the fuel tank unit from the fuel tank. See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and Repair/Fuel
Tank Unit Removal and Installation
NOTE: If the fuel tank is full, drain the fuel. See: Powertrain Management/Fuel Delivery and Air Induction/Service and Repair
9. Measure the resistance between the No. 1 and No. 2 terminals of the fuel pump 5P connector with the float at E (EMPTY), LOW (LOW FUEL
INDICATOR), and F (FULL) positions.
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If you do not get the following readings, replace the fuel gauge sending unit. See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Pump/Service and Repair/Fuel Pump/Fuel Gauge Sending Unit Replacement
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If the fuel gauge sending unit test is OK, do the secondary fuel gauge sending unit test. See: Secondary Fuel Gauge Sending Unit Test
NOTE: Remove the No. 15 BACK UP (40 A) fuse from the under-hood fuse/relay box for at least 30 seconds after completing troubleshooting,
otherwise it may take up to 20 minutes for the fuel gauge to indicate the correct fuel level.
