4.
Read "DTC Status" parameter
A communication line exists between the Engine Control Module(ECM) and the Transaxle Control Module(TCM). The communication is through a Control Area Network(CAN). Without CAN communication, an independent pin and wiring is needed to receive a sensor information from a ECM. The more information to be communicated, the more wirings is required. In case of CAN communication type, all the information need to be communicated among control modules such as ECM and ABS control module use CAN lines.
The ECM determines CAN communication error and sets DTC U0101 if no message received from TCM
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Check CAN message transfer status | ● Poor connection or damaged harness ● Faulty PCM |
Enable Conditions | ● Battery voltage > 10V ● Engine speed > 32rpm ● Delay time >0.5 sec. | |
Threshold Value | ● No message from TCM | |
Diagnostic Time | ● 0.1 sec. | |
Mil On Condition | ● 2 Driving Cycles |
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
Press F4(DTAL) to select DTC information from the DTCs menu
Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
Read "DTC Status" parameter
Is parameter displayed "History(Not Present) fault"?
History (Not Present) fault : DTC occurred but has been cleared.
Present fault : DTC is occurring at present time.
 | ▶ Fault is intermittent caused by poor contact in the sensor(s) and/or the PCM's connector was repaired and PCM memory was not cleared. Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure. |
 | ▶ Go to "W/Harness Inspection" procedure |
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
| ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure |
| ▶ Go to Component Inspection" procedure |
Ignition "OFF"
Measure resistance between High signal terminal and Low signal terminal of PCM connector(PCM side).
Specification : Approx. 110~130Ω
Is resistance within the specification?
| ▶ Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure |
| ▶ Check ECM for contamination, deterioration, or damage. Substitute with a known-good PCM and check for proper operation. If the problem is corrected, replace PCM and then go to "Verification of Vehicle Repair" procedure. |
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
Read "DTC Status" parameter
Is parameter displayed "History(Not Present) fault"?
| ▶ System performing to specification at this time. Clear the DTC. |
| ▶ Go to the applicable troubleshooting procedure. |
