TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 1191 of 1275
TM9-2350-311-20-1 1 CONDITION CURRENT PROBE DO OFFSFT: . . - Connect P1 of transducer cable W4 to J3 on the VTM. - Connect P2 of cable W4 to current probe, TK item 11. - Clamp current probe around positive battery cable connected to starter. Point arrow on probe toward starter. - Make sure current probe is closed. . Crank engine for several cycles with fuel shut off. - Engage starter long enough to briefly turn engine (approximately 1 second). - Turn off all vehicle electrical power. I NOTE I If engine does not crank, go to NG 20 (Figure 3, sheet 1). Engine must not start while performing this step. If engine starts, repeat step. - Set TEST SELECT switches to 72, press and hold TEST button until CAL message appears on display. - Release TEST button. - Wait for offset value to appear. IS offset value within the limits of -225 to +225? While cranking engine with bad or discharged batteries, it is possible for VTM to lose power and come on again displaying ---- after cranking stops. If this ever occurs, go to NG 21 (Figure 3, sheet 2). Refer to TM 9-4910-571-12&P for offset fault isolation. MEASURE CURRENT - FIRST PEAK: - Press and release TEST button. - Wait for prompting message GO to appear on display. When GO appears, crank engine until-OFF or error message is displayed (approximately 2 seconds) Figure 2, Sheet 8 of 20 I-14 Go to Figure 2, sheet 9. NOTE