TM 9-6115-730-24
0011
TROUBLESHOOTING FAILURES WITHOUT FAULT CODES - Continued
MALFUNCTION
Combustion Gases in Coolant.
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Check for combustion gases in coolant. Combustion gases in coolant can be
identified by small air bubbles in the coolant during engine operation. If
combustion gases are present, replace the engine (WP 0096).
STEP 3.
Verify the problem has been resolved.
SYMPTOM
35.
ECM Will Not Communicate With Other Systems or Display Modules.
MALFUNCTION
Wire or Connector Pins Corroded or Damaged.
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Disconnect harness connector ENG-P1 from ECM connector J1, harness
connector CDC-P7, and harness connector ENG-P37 from generator connector
J37 (WP 0088).
STEP 3.
Inspect harness connectors ENG-P1, CDC-P7, and ENG-P37, and generator
connector J37 for corrosion or damage. Repair or replace harness as required
STEP 4.
Conduct Wiggle Test (WP 0013, SYMPTOM 1) on each of the harness wires that
are associated with the Cat data link (FO-2, sheet 2 and WP 0088). Repair or
replace harness as required (WP 0088).
STEP 5.
Verify the problem has been resolved.
MALFUNCTION
Cat Data Link Circuitry Short Circuit.
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL Switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Disconnect ENG-P1 harness connector from ECM connector J1.
STEP 3.
Measure the resistance between ENG-P1 harness connector pin 8 and all other
connector pins. All measurements should indicate open, if not repair or replace
harness (WP 0088).
0011-48
