Circuit Description
The Fuel Level sensor is an important input to the VCM for the Enhanced Evaporative System Diagnostic. The VCM needs the fuel level information in order to know the volume of fuel in the tank. The fuel level affects the rate of change in the air pressure in the EVAP system. Several of the Enhanced Evaporative System Diagnostic sub-test are dependent upon the correct fuel level information. The diagnostic will not run when the tank is greater than 85% or less than 15% full. (This sensor signal disables the misfire when the fuel levels are less than 15%). This DTC is a type D DTC.
Conditions for Setting the DTC
| • | The Fuel Tank Slosh Test is completed. |
| • | The Fuel Tank Main Level Test is completed. |
| • | The Fuel Tank Level Data is valid. |
| • | The Fuel Level signal voltage is less than 0.39 volts for a period greater than 20 seconds. |
Action Taken When the DTC Sets
| • | The control module stores the DTC in history after the first failure but will not illuminate the malfunction indicator lamp (MIL). |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame/Failure Records. |
Conditions for Clearing the MIL/DTC
The VCM turns OFF the MIL after 3 consecutive driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (the coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle) or the scan tool clearing feature has been used.
Test Description
The numbers below refer to the step numbers in the diagnostic table.
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This step checks the wiring, connections, and the VCM.
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This step checks the wiring, connections, and the VCM.
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This step checks the wiring, connections, and the VCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Does the scan tool display the specified value? | 0%-1% | ||
3 | Refer to Fuel Level Sender Guage Module Diagnosis in section 8A. | -- | -- | -- |
With a DVM to ground, probe the fuel level sensor input at the Fuel Level Sender Gauge Module. Is the voltage less than the specified value? | 0.13V | |||
5 | Check for a open in the fuel level sensor input circuit. Was a problem found? | -- | ||
With a DVM to ground, probe the fuel level output at the Fuel Level Sender Gauge Module. Is the voltage less than the specified value? | 0.13V | |||
7 | Check for a open in the fuel level output circuit. Was a problem found? | -- | ||
With a DVM to ground, probe the fuel level module output at the Fuel Level Sender Gauge Module. Is the voltage greater than the specified value? | 2.9V | |||
9 | Repair the open in the fuel level sensor input circuit. Is the action complete? | -- | -- | |
10 | Repair the open in the fuel level output circuit. Is the action complete? | -- | ||
11 | Repair the short to voltage in the fuel level module output circuit. Is the action complete? | -- | -- | |
12 | Replace the VCM. Important: If the VCM is faulty, program the new VCM. Refer to VCM Replacement/Programming . Is the action complete? | -- | -- | |
13 |
Does the scan tool indicate that this diagnostic Ran and Passed? | -- | ||
14 | Using the scan tool, select the Capture Info and the Review Info. Are any DTCs displayed that have not been diagnosed? | -- | Go to the Applicable DTC Table | System OK |
