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DTC Troubleshooting

NOTE: Upon completion of inspection and repair work, perform Intermittent and Poor Connection Inspection and confirm that the trouble has been corrected.
DTC TROUBLESHOOTING CHART

Step Action YES NO
1  Was "A/T System Check" performed?  Go to Step 2. Go to A/T SYSTEM CHECK .
2  Control module connector check 
  1. Check connection of connectors of all control modules communicating by means of CAN.
  2. Recheck DTC in TCM.

Is there DTC U0140? 		 Go to Step 3. Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
3  DTC check in BCM (bus off) 
  1. Check DTC in BCM.

Is there DTC U1073? 		 Go to DTC U1073 (NO. 1073): CONTROL MODULE COMMUNICATION BUS OFF . Go to Step 4.
4  DTC check 
  1. Check DTC in ECM.

Is there DTC U0140? 		 Check BCM power and ground circuit. If circuit is OK, substitute a known-good BCM and recheck. Go to Step 5.
5  CAN communication circuit check 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors of all control modules communicating by means of CAN.
  3. Check CAN communication circuit between control modules for open, short and high resistance.

Is each CAN communication circuit in good condition? 		 Check TCM power and ground circuit. If circuit is OK, substitute a known-good TCM and recheck. Repair circuit.
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