(b)  
This BITE sequence tests all functions that are practicable within the equipment and displays fault code via the engine OIL QTY digital display counter. Table B gives the module area tested and fault codes. If a successful BITE check is accomplished, then the lowest value of each LED pointer shall read-out simultaneously and slew to the highest possible value. All digital counters will energize all seven segments of each character in the display. Upon test completion, the displays will revert to their pretest conditions.

 Table B: EIS Secondary Display Fault Codes
 ~......................................... | MODULE AREA TESTED | FAULT CODES | ........................................... | Microprocessor | 0 -| | EPROM | 1 -| | RAM | 2 -| | Analog/Digital Convertor | 3 -| | Power Monitor | 4 -| | 400 Hz Reference Voltage | 5 -| | ARINC Receiver | 6 -| 2...........................….............1
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 31-42-00
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737-300/400/500MAINTENANCE MANUAL
 C. Control
 (1)  
EIS Primary Display

 (a)  
Close the following circuit breakers on P6-2 panel: EIS PRIMARY 1 EIS PRIMARY 2 EIS PRIMARY 3 EIS PRIMARY 4

 (b)  
Observe and note the initial indications on N1, EGT, N2 and FF displays. Ensure that N1, EGT, N2, and FF displays are not blank.

 (c)  
Pull the manual set knob out, observe and note that N1 value(s) can be set on both N1 limit bug and MAN SET counter while turning the knob.

 (d)  
Press FUEL USED PUSH button to display the amount of fuel used value in FF/FU indicator.

 (e)  
Press the RESET FUEL USED button to set the fuel used value to zero on the FF/FU indicator.

 (f)  
Press and held the unmarked BITE button, the display unit will perform the BITE sequence (Ref 31-42-00/501).

 (g)  
Upon BITE completion, release the BITE button, the display will revert to their pre-test conditions.

 (2)  
EIS Secondary Display

 (a)  
Close the following circuit breakers on P6-2 panel: EIS SEC 1 EIS SEC 2 EIS SEC 3 EIS SEC 4 EIS SEC 5 EIS SEC 6

 (b)  
Observe and note the initial indications on all displays. Ensure that none of the displays are blank.

 (c)  
Press and hold the unmarked BITE button to place the unit into BITE mode (Ref 31-42-00/501).

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737-300/400/500MAINTENANCE MANUAL
 (d)  Upon BITE completion, release the BITE button, the display will revert to their pre-test conditions.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 ENGINE INSTRUMENT SYSTEM - TROUBLE SHOOTING
___________________________________________
 1.  General_______
 A.  The Engine Instrument System (EIS) has a primary display and a secondary display. The displays are instrument panels that are controlled by a microprocessors. The displays are not attached.
 B.  You have an internal failure or malfunction when the pointer and numeric counter (if applicable) go out of view. A fault code will be shown when you do BITE. The fault code identifies which internal module is defective (Ref 31-42-00).
 C.  The EIS can also find interface failures. The analog sensors and digital signals into the EIS are continuously monitored. A sensor failure, a signal failure, or the loss of input power, is shown as in Table A.
 D.  You trouble shoot the Engine Instrument System (EIS) when you do a BITE test. You do a BITE test when you push and hold the BITE test button. The BITE test button is a push switch on the lower part of the faceplate.
　
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