MOHAVE/BORREGO(HM) > 2010 > G 3.
8 DOHC > PIC > Smart Key Unit > B1625 ECM
Communication Data Failure
B1625 ECM Communication Data Failure > General Information
Component inspection
General Description
Smartkey Module communicates with ECM through the serial communication line.
If ECM requests authetication from Smartkey Module after IG ON, Smartkey Module check authentication with transponder then,
sends this signal to ECM whether authentication is O.K or not.
DTC Description
Smartkey Module sets DTC B1625 if Data from ECM is error such as check sum error, Data Frame error, ID Unknown error, Data
length error and Time out error.
DTC Detecting Condition
Item Detecting Condition Possible cause
DTC Strategy • Check received Data Status from ECM • Poor Connection in Harness
• Data that Smartkey Module received from ECM is error after • Input Power to Smartkey Module
Enable Conditions • Open or short in EMS
IGN OFF to IGN ON
communication line.
Threshold value • Received data error from ECM • Faulty Smartkey Module
Failsafe •- • Faulty ECM
Diagnostic Circuit Diagram
B1625 ECM Communication Data Failure > Scantool Diagnostics
Monitor Scantool data
■ Check DTC status
1. Check DTC on the ECM with Scantool.
2. Check that there is any DTC related ECM.
3. Perform Troubleshooting the DTC from ECM with appropriate DTC Troubleshooting Guide first.
4. Repair or replace as necessary after erasing DTC with Scantool.
5. Check DTC on SMK Module side and erase the DTC with scantool.
6. Has the DTC gone after erasing with scantool ?
▶ Check poor connection between harness connector and Smartkey Module or ECM
: Thoroughly check the looseness, poor connection, bent, corrison, contamination, deformation or damage
of connector. Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
▶ Go to " Inspection & Repair " procedure.
B1625 ECM Communication Data Failure > Inspection/Repair > W/Harness Inspection
Terminal and Connector Inspection
1. 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.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.
3. Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to " Check serial commuication Cricuti Inspection" as follow.
Serial Communicatin Circuit Inspection
■ Check short in serial communication line
1. "IG KEY OFF"
2. Disconnect Smartkey Module connector and ECM connector.
3. Measure resistance between serial communication signal terminal of ECM harness connector and chassis ground.
Specificatin : Infinite (∞)
4. Is the measured resistance within specification ?
▶ Go to open in harness as follow
▶ Check short to ground in harness. And then, repair or replace as necessary. Finally, go to "Verification of
Vehicle Repair" procedure.
■ Check open in harness
1. IG KEY OFF.
2. Disconnect Smartkey Module connector and ECM connector.
3. Measure resistance between signal terminal of Smartkey Module harness connector and signal terminal of ECM harness
connector.
Specification : About below 1Ω
4. Is the measured resistance within specification ?
▶ Check poor connection between harness connector and Smartkey Module or ECM
: Thoroughly check the looseness, poor connection, bent, corrison, contamination, deformation or damage
of connector. Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
▶ Check open in signal harness. And, repair or replace as necessary then, go to "Verification of Vehicle
Repair " procedure.
B1625 ECM Communication Data Failure > Verification of Vehicle Repair
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and selet "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scantool.
3. Are any DTCs present?
▶ Go to the applicable troubleshooting procedure.
▶ System is performing to specification at this time.
B1625 ECM Communication Data Failure > 회로도 입력
Schematic Circuit Diagram
