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 following conditions will set the DTC:
| • | The Fuel Tank Level Slosh Test is completed |
| • | The Tank Level Main Test is completed |
| • | The Fuel Tank Level Data Valid |
| • | The Fuel Level signal is unchanged over a distance of 34 miles |
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
Number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing DTC(s), use a scan tool to record Freeze Frame and Failure Records data, as data will be lost when the Clear Info function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Are the readings approximately the same? | -- | ||
Did the vehicle fuel gauge reading change? | -- | |||
4 | Check for a short to ground between the VCM and the splice. Was a problem found? | -- | Go to Engine Electrical for Fuel Gauge Diagnosis | |
5 |
Is the voltage displayed greater than the specified value? | 1.0V | ||
6 | Repair the open in the fuel level sensor signal circuit between the VCM and the splice. Is the action complete? | -- | -- | |
7 | Check the terminal contact at the VCM for the fuel level sensor signal circuit. Was a problem found? | -- | ||
8 | Repair as necessary. Is the action complete? | -- | -- | |
9 | Replace the VCM. Important: If the is faulty, the replacement VCM must be programmed. Refer to VCM Replacement/Programming | -- | -- | |
10 |
Does the scan tool indicate that this diagnostic Ran and Passed? | -- | ||
11 | Using the scan tool, select Capture Info, Review Info. Are any addition DTCs displayed that have not been diagnosed? | -- | Go to Step Applicable DTC Table | System OK |
