BI-Fuel/Alternative Fuels

CIRCUIT DESCRIPTION
The Alternative Fuels ECM contains data storage areas. The Alternative Fuels ECM runs a test on the stored data called a checksum. This DTC is used to indicate a failure has occurred within the Alternative Fuels ECM.

CONDITIONS FOR RUNNING THE DTC
The ignition switch is ON.

CONDITIONS FOR SETTING THE DTC
The Alternative Fuels ECM monitors an internal malfunction.

ACTION TAKEN WHEN THE DTC SETS
The Alternative Fuels ECM will switch-over to gasoline fuel operation. Alternative fuel operation will not be attempted until the next ignition key cycle.
^ The Alternative Fuels ECM will illuminate the MIL and store the DTC as History during 1 drive trip in which the diagnostic runs and fails.
^ The Alternative Fuels ECM will record operating conditions at the time the DTC sets. This information will be stored as Freeze Frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The Last Test Failed status will clear when the DTC runs and passes.
^ The Alternative Fuels ECM will turn OFF the MIL after 3 consecutive drive trips that the DTC runs and passes.
^ The History status will clear after 40 consecutive WARM-UP cycles with NO failures of ANY DTC.
^ All DTC Information can be cleared using a scan tool.
^ Interruption of Control Module (AF ECM/VCM/PCM or ECM) power or ground MAY clear DTC Information. Clearing DTC Information with this method is in-consistent and should not be performed.

TEST DESCRIPTION

Steps 1-3:

The number below refers to the step number on the diagnostic table.
2. Any failure of the Alternative Fuels ECM internal tests that results in this DTC being set requires that the Alternative Fuels ECM be replaced.