Consult Alpha Test

Note:
The best way to resolve a Code 45 or driveability incident is to carefully go through ALL the steps contained within this bulletin.





The "ALPHA" reading of CONSULT indicates if the fuel mixture is rich, lean, or correct.

Perform the following check to verify that a "Rich" condition exists.





With CONSULT plugged in and turned on with the engine at operating temperature and just above 2000 rpm:





The ALPHA reading should be in the range of 90% to 110%, if the fuel mixture is correct. One hundred percent indicates that no correction to the base fuel schedule is necessary. Less than 100% indicates that the O2 sensor is detecting a rich condition and less fuel will be injected to correct for this. The lower the ALPHA percentage the richer the mixture.

Note:
Obtaining a base line ALPHA reading at 2,000 rpm is necessary for verifying any repairs.