In the Ignition ON position, the ECM receives information from the ICM and permits injection to take place If the CODE memorized in ECM is coincided with ICM.
When the ID code from the transponder is verified by the ICM then the registering sequence is complete and a answer signal is sent to the ECM.
The ICM sends a START or NO START signal to the ECM.
The DTC will set, there is no data transmitted from ECM for 5 seconds after ignition ON.
Item
Detecting Condition
Possible Cause
DTC Strategy
CAN Data status receiving from ECM
Open or Short in harness between ECM and ICU
Faulty ECM
Faulty ICU
Threshold value
No data transmitted from ECM for 5 seconds after ignition ON
Detecting time
1 time
DTC Erasing
Condition
Without a fault or using a scantool
Fig.1) A normal signal waveform of antenna and immobilizer communication when IG key(TP: Transponder) is OFF to ON.