When Monitored

This diagnostic runs continuously when the following conditions are met:

Single Tank System:

With the engine running for more than two minutes.
After the PCM decides that a calibrated amount of fuel should have been consumed (between approximately one and five gallons depending on initial fuel level).
- This is determined by the accumulated amount of fuel injected into the engine through the Fuel Injectors.

Saddle Tank System:

The primary level rationality diagnostic runs when the Fuel Level Sensor 2 (Secondary) is reading empty.
The secondary level rationality diagnostic runs when the Fuel Level Sensor 1 (Primary) is reading full.

Dual Tank System:

The primary level rationality diagnostic functions the same as the Single Tank System.
The secondary level rationality diagnostic runs when a fuel transfer event is occurring.

Set Conditions for Single Tank vehicles:

If the PCM does not see a change in fuel level of greater than 0.06 volts after the calibrated amount of fuel should have been consumed the diagnostic will fail.

Set Conditions for Saddle Tank vehicles:

Primary Fault (P0461) - If the PCM does not see a change in Fuel Level Sensor 1 of greater than 0.06 volts after the calibrated amount of fuel should have been consumed the diagnostic will fail.
Secondary Fault (P2066) - If the PCM does not see a change in Fuel Level Sensor 2 of greater than 0.06 volts after the calibrated amount of fuel should have been consumed the diagnostic will fail.

Set Conditions for Dual Tank vehicles:

Primary Fault (P0461) - If the PCM does not see a change in fuel level of greater than 0.06 volts after the calibrated amount of fuel should have been consumed the diagnostic will fail.
Secondary Fault (P2066) - No change in Fuel Level Sensor 2 circuit voltage after a significant amount of fuel should have been transferred from the Auxiliary Fuel Tank to the Primary Fuel Tank.

Default Actions: