TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0017 00 0017 00-21 SIMPLIFIED TEST EQUIPMENT FOR INTERNAL COMBUSTION ENGINE—REPROGRAMMABLE (STE/ICE-R) GO CHAIN TROUBLESHOOTING (Contd) Table 2. STE/ICE-R Go Chain Test (Contd). PROMPTING MESSAGE NOTE Test GO1, VTM Connections and Checkout must be performed before running any other STE/ICE-R test. COMPRESSION UNBALANCE TEST G09 NOTE The compression unbalance test takes approximately 15 seconds to run. RUN COMPRESSION UNBALANCE TEST: • Install pulse tachometer (TK item 34) with transducer cable W4 (see GO 3). • Shut off fuel supply so that engine will not start. • Dial 14 into TEST SELECT switches and press TEST. • Wait for prompting message GO to appear. • Does VTM display GO? • Proceed to next page. CAUTION Do not perform more than two compression unbalance tests in a row, or vehicle batteries may be discharged. If possible, engine should be at operating temperature when performing compression unbalance test. • When GO appears, crank engine. • Just after cranking, VTM display should change to four dashes indicating VTM is accepting data. • Stop cranking when VTM displays OFF or E013 • Wait for a number to be displayed. Does VTM display a number? TEST NO. TEST 14 COMPRESSION UNBALANCE NO YES YES NO • Rerun compression unbalance test. • If unbalance test is still out of limits, refer to Mechanical System Troubleshooting Index (WP 0007 00) to diagnose engine. • Does VTM display fail? YES • VTM displays E013. This may indicate discharged batteries or low cranking speed. Also, the operator may have stopped cranking during test. Correct problem and repeat test. NO TK MODE