CHART -6 - "STOP ENGINE" LIGHT ON AND NO ACTIVE CODE ON DDR

ECM VEHICLE HARNESS CONNECTOR - TM-9-2320-363-20-1_621

THE ELECTRONIC CONTROL MODULE - DDEC III - TM-9-2320-363-20-1_623

TM-9-2320-363-20-1 Truck Tractor Line Haul: 52 000 GVWR 6x4 M915A2 (NSN 2320-01-272-5029) Manual
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STEP/SEQUENCE RESULT WHAT TO DO NEXT TM 9-2320-363-20-1 Section 4 TROUBLESHOOTING CHARTS D. CHART -6 - "STOP ENGINE" LIGHT ON AND NO ACTIVE CODE ON DDR NOTE - This chart is only to be used if: 1) All basic mechanical checks and physical inspections have been performed with no problem found, and 2) Diagnosis of DDEC-III was started at step Start-1, pg 3-345.41 and you have now been referred here. This is a Digital output function. C 6-1 Determine "Stop Engine" Light Status Turn ignition on (engine not "Stop Engine" This is the normal operation. running) while at the same time light comes on for Unless other problems exist, observing "Stop Engine" light. up to 5 seconds, return to service. then goes out. "Stop Engine" Go to C6-2. C 6-2 Light Status - DDR Plug in DDR. Select switch/light status. SEL reads on. Go to C6-4. Read SEL. SEL reads off. Go to C6-3. C 6-3 Check for Short Turn ignition off. "Stop Engine"" Stop Engine" light driver line Disconnect the vehicle harness light comes on (ckt #509) is shorted to ground. connector at ECM. and stays on. Repair short. Then go to C6-30. Turn ignition on (engine not running while at same time observing "Stop Engine" light. "Check Engine" Go to C6-4. light stays off. C 6.4 Check ECM Connectors Check terminals at vehicle Terminals Replace ECM, then go to C6-30. harness connector (both ECM and connectors and harness side) for damage are okay. bent, corroded, and unseated pins or sockets Pay close Problem found Repair terminals/connectors. attention to B2 and B3. Then go to C8-30. Change 3 3-345.95

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