2010 Cadillac CTS Sedan AWD V6-3.6L Page 1441
* The fuel gauge defaults to empty.
* The low fuel indicator illuminates
Conditions for Clearing the DTC
* The DTC clears when the fault is no longer detected.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred
Reference Information
Schematic Reference
Instrument Cluster Schematics (See: Diagrams/Electrical Diagrams/Instrument Panel, Gauges and Warning Indicators/System Diagram/Instrument
Cluster Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Fuel Gauge Description and Operation (See: Instrument Panel, Gauges and Warning Indicators/Description and Operation/Fuel Gauge)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Circuit/System Verification
Ignition ON, observe the scan tool ECM Secondary Fuel Level Sensor parameter. The reading should be between 0.9-4.98 V.
Circuit/System Testing
Note: If equipped, the following tests can be performed at an inline connector. See schematics for the appropriate circuit terminals.
1. Ignition OFF, disconnect the harness connectors at the fuel pump and sender assembly.
2. Test for less than 1.0 ohm between the low reference circuit terminal 4 and ground.
瀚慖f greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests
normal, replace the ECM.
3. Ignition ON, verify the scan tool ECM Secondary Fuel Level Sensor parameter is greater than 4.75 V.
瀚慖f less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
4. Connect a 3 A fused jumper wire between the signal circuit terminal 1 and ground, verify the scan tool ECM Secondary Fuel Level Sensor
parameter is less than 1 V.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the ECM.
5. If all circuits test normal, test or replace the fuel pump and sender assembly.
Component Testing
Note: This DTC only sets when test parameters indicate that an intermittent condition has occurred on multiple occasions. If the fault is not present
do not replace components. Test again, as you perform action to induce the intermittent fault (moving harnessess, terminals and connectors, etc.)
while observing the test readings.
1. Ignition OFF, disconnect the harness connector at the fuel pump and sender assembly.
2. Remove the fuel pump and sender assembly from the fuel tank.
3. While sweeping the primary fuel level sensor through its full range of motion, test for a minimum value less than 41 ohm and a maximum
value greater than 119 ohm between signal terminal 1 and the low reference terminal 4.
瀚慖f not within the specified range, replace the fuel pump and sender assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
