Ignition "ON" & Engine "OFF"
Netralize ICU and engine ECU with scanner.
1.Be sure that PIN code is prepared before performing neutralization and key teaching.
2.After doing neutralization of ICU by scanner, It is neccessary to turn the key "OFF → ON" . Because ECM is neutralized by ICU.
Substitute with a known-good neutral ECU, and perform key teaching.
Monitor CURRENT DATA and DTCs.
Is DTC P1679 displayed again ?
YES
Go to "Check ICU" procedure as below.
NO
Replace the engine ECU and Perform key, password teaching.
Before replace the engine ECU, perform neutralization of the ICU.
Check for proper operation and the go to "Verification of Vehicle Repair" procedure.
Ignition "ON" & Engine "OFF"
Netralize ICU and engine ECU with scanner.
1.Be sure that PIN code is prepared before performing neutralization and key teaching.
2.After doing neutralization of ICU by scanner, It is neccessary to turn the key "OFF → ON" . Because ECM is neutralized by ICU.
Substitute with a known-good neutral ICU, and perform key teaching.
Monitor CURRENT DATA and DTCs.
Is DTC P1698 displayed again ?
YES
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,deterioration, or damage.
Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
Replace the ICU and Perform key, password teaching.
Before replace the ICU, perform neutralization of the engine ECU.
Check for proper operation and the go to "Verification of Vehicle Repair" procedure.
