PLATE-WARNING 6V7989 - Caterpillar

This diagnostic code is associated with the suspension cylinder (right front). This diagnostic code indicates that the PMC has determined that the suspension cylinder is bottoming out during the operation of the truck. The PMC determines that the suspension cylinders are bottoming out by comparing the pressures in the suspension cylinders. This indicates that the suspension cylinder is incorrectly charged.Note: The PMC may not detect all incorrectly charged suspension cylinders. Do not use this diagnostic code as a substitute for normal maintenance of the suspension cylinders.There are four diagnostic codes that are associated with the charging of the suspension cylinders. The diagnostic codes are listed below:F01 - Suspension Cylinder (Left Front)F02 - Suspension Cylinder (Right Front)F03 - Suspension Cylinder (Left Rear)F04 - Suspension Cylinder (Right Rear)The PMC continually monitors the pressure changes that occur among the four suspension cylinders as the truck is traveling in the "loaded" state.System Response:When this diagnostic code is active the external load indicator lights will flash alternately while the truck is in the "loading" state. The flashing load indicator lights are used to inform maintenance personnel that a problem exists. This will prevent the TPMS from properly weighing the payload. This condition may also cause damage to the frame or suspension cylinder.Test Step 1. CHECK FOR ACTIVE DIAGNOSTIC CODES
Turn the key start switch and the ON/OFF switch on the POD to the On position.
Check for any of the diagnostic codes that are listed below: F01 - Suspension Cylinder (Left Front)F02 - Suspension Cylinder (Right Front)F03 - Suspension Cylinder (Left Rear)F04 - Suspension Cylinder (Right Rear)Expected Result:The diagnostic codes are not active or intermittent.Results:
OK - The diagnostic codes are not active or intermittent.Repair: Return the truck to service.STOP
NOT OK - The diagnostic codes are active or the diagnostic codes are intermittent.Repair: The suspension cylinders need to be serviced. Service the suspension cylinders.STOP