General Description
The ECM/PCM controls the engine, in a normal way for starting and running, and starts communication with the Smart Key ECM/PCM, sending a PIN request to the Smart Key ECM/PCM and waiting for valid release message from it until the release time period has ended.
In case of Smart Key ECM/PCM immobilizer function is locked, the Smart Key ECM/PCM answer is the no release message. ECM/PCM enters in the locked state, which causes the activation of the imobilization actions of the engine.
In case of Smart Key ECM/PCM immobilizer function state is released, the Smart Key ECM/PCM answer is the release message, including the information Smart Key ECM/PCM inlearnt mode and the PIN code.
DTC Description
This DTC is set, after Engine ECM/PCM sends wake-up signal, if response signal from Smart key ECM/PCM is abnormal structure or is not valid message during engine ECM/PCM communication.
The ECM/PCM controls the engine, in a normal way for starting and running, and starts communication with the Smart Key ECM/PCM, sending a PIN request to the Smart Key ECM/PCM and waiting for valid release message from it until the release time period has ended.
In case of Smart Key ECM/PCM immobilizer function is locked, the Smart Key ECM/PCM answer is the no release message. ECM/PCM enters in the locked state, which causes the activation of the imobilization actions of the engine.
In case of Smart Key ECM/PCM immobilizer function state is released, the Smart Key ECM/PCM answer is the release message, including the information Smart Key ECM/PCM inlearnt mode and the PIN code.
DTC P1690 is set ECM/PCM has not received any signals related starting engine, Although ECM/PCM sends wake up signal to Smart Key ECM/PCM.
Information related immobilizer, that are classified as 2 (two) parts independently, is memorized in EEPROM. ECM/PCM check these 2 (two) information before proceeding immobilizer authentication. With synchronized both information, ECM/PCM starts immobilizer authentication procedure. If both information is not synchronized, ECM/PCM stops immobilizer authentication, Limphome function will not be activated, and memorizes DTC P1695. If DTC P1695 is retrieved again, after performing new key teaching procedure, ECM/PCM should be replaced with new one.
If key/password information in ECM/PCM is not matching or there is write error on EEPROM as hardware, DTC P1696 is set.
The smart key system is totally composed of a smart key module, a power distribute mode, an external receiver and a smart key holder.
The SMK 2.5, the smartkey system which has not Fob holder, is embed with a Demodulator. so the two Immo coil lines are connected this SSB. Smart key units sends a certified signal to the ECM/PCM through this process and then takes the engine to start by receiving the permission signal of engine start.
During the Immobilizer authentication, If there is any wrong VIN(Vehicle Identification Number) or MIN(Model Identification Number) signal on the communication message, ECM/PCM sets DTC P1696.
This is special function that engine can be started for moving to an area where the key learning is processed with twice IG ON. This function is only performed in condition that Engine EMS, Smart key ECM/PCM, Transponder and ESCL are all virgin status.
Engine can be started by the sequence.
- Ignition ON with no cranking, Ignition OFF, Ignition ON with cranking within a time interval
- The following timing conditions have to be fulfilled for successful start: Engine EMS, Smart key ECM/PCM, Transponder are all virgin status.
- First Ignition ON more than 0.5 seconds and less than 1.5 seconds.
- Ignition OFF time is limited by the minimum of 0.2 seconds and the maximum of 1.5 seconds.
- Ignition ON.
The number of engine starts by "twice ignition on" is limited. The maximum value is 32 times regardless of cranking.
DTC P1699 is set if twice ignition ON exceeds maximum limit over 32 times.