3.
Monitor DTC(Diagnostics Trouble Code) on the scantool.
PCM monitors errors through checksum. Every information consists of the combination of 0 and 1, checksum means summing up all values in a row. Thus, errors are recognized comparing checksum value and the memory value at PCM.
ECM detects the signal exchages between micro-processor and sensor/actuator. By the way, if there is error, ECM sets DTC P0605.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Check internal ROM | 1. Poor connection 2. ECM |
Enable Conditions | ||
Threshold Value | ● Each check sum of several blocks (Actual check sum ≠ check sum data) | |
Diagnostic Time | ||
MIL ON Condition | ● Immediately ON |
Connect scantool to Data Link Connector(DLC).
Key "ON" ＆ ENG "OFF".
Monitor DTC(Diagnostics Trouble Code) on the scantool.
Are the parameters displayed correctly?
▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or wasrepaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poorconnection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.
▶ Go to "Terminal and Connector Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness 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.
▶ Substitute with a known-good ECM and check for proper operation. If the problem is corrected, replace ECM 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.
Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
Are any DTCs present ?
▶ Go to the applicable troubleshooting procedure.
▶ System is performing to specification at this time.
