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34.  ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT) - TM-9-2320-364-20-2_698
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34.  ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT) - TM-9-2320-364-20-2_700
TM 9-2320-364-20-2      2-1475 (1)   Set multimeter select switch to volts dc. (2)   Connect positive (+) multimeter lead to wire 213 at retarder relay R8, terminal 85. (3)   Connect negative (–) multimeter lead to a known good ground. (a)   If 10 to 14 vdc are not present, replace ATEC ECU (Para 7-71). (b)   If 10 to 14 vdc are present, perform Steps (4) through (6) below. (4)   Start engine (TM 9-2320-364-10). (5)   While assistant applies throttle control for 10 seconds at 2000 rpm and quickly releases throttle control, observe multimeter. (a)   If 10 to 14 vdc are still present, turn OFF ENGINE switch and replace ATEC ECU (Para 7-71). (b)   If 10 to 14 vdc momentarily drops to zero (0) vdc, ATEC ECU is OK. (6)   Turn OFF ENGINE switch. VOLTAGE TEST Remove all jewelry such as rings, dog tags, bracelets, etc.  If jewelry or tools contact positive electrical circuits, a direct short may result.  Damage to equipment, injury or death to personnel may occur. Circuit breakers CB5, CB6, CB12, CB20, CB22, CB23 and relays R3, R13 - R19, R26, R28, R32, R33 are always electrically hot and can cause severe injury to personnel.  Care must be exercised when working under the electrical circuit board cover. The ATEC 213 circuit goes to ground when the engine drops to zero (0) throttle and remains 150 rpm above a normal idle.  This will provide a ground for the retarder relay R8 coil. Relay test must be performed with relay partially removed. NOTE

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