CLAMP AS 9N2039 - Caterpillar

Conditions Which Generate This Code:This dead bus sensor provides an additional indication of the state of the bus. The bus can be live or dead. The input of the dead bus sensor is compared to the reading of the bus voltage, and the diagnostics are produced if the measurements differ.When the input of the dead bus sensor is inactive, the input will float to approximately 10.5 DCV. An inactive state indicates that the bus is live. When the input of the dead bus sensor is active, the bus will be dead.The possible cause of a CID 1168 FMI 03 is a short from the input signal of the dead bus sensor to + battery.A CID 1168 FMI 03 is detected under the following condition.
The voltage of the Phase A of the bus is less than 20% of the rated voltage and the input of the dead bus sensor is floating. The voltage of the Phase A is determined by the "BTB+" input to the GSC+P.The GSC+P treats a CID 1168 FMI 03 as an alarm fault. The dead bus paralleling function will be stopped when this diagnostic code is detected. No other synchronization processes will be affected.Test Step 1. CHECK THE INACTIVE VOLTAGE LEVEL OF THE INPUT OF THE DEAD BUS SENSOR .
Turn the engine control switch (ECS) to STOP.
Locate the wire that is connecting pin 29 of the GSC+P to the terminal 9 of the bus relay ("BUSR"). Remove this wire at terminal 9 of the "BUSR" only. Pin 29 of GSC+P will remain connected to the wire.
Use a cable probe to measure the voltage at pin 29 of the GSC+P.Expected Result:The voltage should measure