PIPE-OUTLET 4N4196 - Caterpillar

Conditions Which Generate This Code:The Bus Transformer Box (BTB +) reduces the AC line to neutral voltages of phase A and phase C from the bus to usable signal levels for the GSC+P. The GSC+P uses these reduced signals for detecting the phase angle with the generator. The GSC+P also uses these reduced signals for detecting the phase sequence of the bus. The GSC+P will utilize the signal of phase A in order to measure the amplitude of the voltage on the bus. The GSC+P will utilize the signal of phase C in order to measure the frequency of the voltage on the bus.The possible cause of a cid 1170 fmi 02 diagnostic code is a short between the phase A and phase B inputs of the BTB +, causing a phase angle of approximately 0°.Test Step 1. CHECK THE PHASE ANGLE OF THE INPUTS TO THE BUS TRANSFORMER BOX (BTB +)
Illustration 1 g00603288
Bus transformer box
Stop the engine. Turn the engine control switch (ECS) to "STOP".
Remove the two fuses from the BTB +.
Measure the resistance of the fuses with a digital multimeter.Expected Result:The resistance should be less than 1.0 ohms.Results:
OK - The resistance is less than 1.0 ohms. The fuses have not failed. Install the fuses. Proceed to Test Step 2.
NOT OK - The fuses are blown. Replace the fuses. Proceed to Test Step 2.Test Step 2. CHECK THE VOLTAGE ON THE BTB+ INPUT
Start the engine and run the engine