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Optima/Magentis(MG) > 2010 > D 2.0 TCI-D > Immobilizer > Immobilizer >
P1694 Immobilizer-EMS Message Error
P1694 Immobilizer-EMS Message Error > General Information
Component Location
General Description
The ECM and the SMARTRA communicate by dedicated line. During this communication of ECM and
SMARTRA, the K line of ECM cannot be used for communication. The ECM controls the communication either to
SMARTRA or to other devices(e.g. scanner) on K line by switching of a multiplexer and specific communication
procedures. The multiplexer is a part of ECM H/W.
DTC Description
The ECM sets DTC P1694 if Request from EMS is invalid.
DTC Detecting Condition
Item Detecting Condition Possible Cause
DTC Strategy •
Enable Conditions • IG ON • Faulty EMS
※ Protocol layer violation
Threshold value •-
- Invalid request
Detecting time •- - Check sum error
FAIL SAFE •-
Diagnostic Circuit Diagram
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P1694 Immobilizer-EMS Message Error > Scantool Diagnostics
Monitor GDS Data
1. Check status
(1) IG "ON" & Engine "OFF"
(2) Monitor the "ECU, KEY and Smartra STATUS' Parameter on the GDS.
Specification : 'LEARNT'
Fig.1) This data show that 3 keys have been taught, ECU has been learnt, Key in key cylinder has been lea
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SMARTRA3 has been learnt
(3) Are "KEY STATUS", "SMARTRA STATUS" and "ECU STATUS' Parameter within specifications?
▶ Check connectors for looseness, poor connection, bending, corrosion, contamination, de
damage on the ECM or SMARTRA. And this DTC has not erased in previous repair. Repair
necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "Component Inspection" procedure.
P1694 Immobilizer-EMS Message Error > Inspection/Repair > Component
Inspection
Component Inspection
1. Check ECM
(1) IG "ON" & Engine "OFF"
(2) Neutralize ECM and Register transponder key by GDS.
Pin code is requied to Neutralize ECM and to Register transponder key
(3) Are Neutralizing and Registering completed normally ?
▶ 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.
▶ Substitute with a known-good transponder and perform key teaching procedure with
scanner.
▶ If the problem is corrected, replace transponder and then go to "Verification of Vehicle
Repair" procedure.
ECM substitued for old one must be in "Virgin" or "Neutral" status and Pin code is required to Neutralize
ECM and to Register transponder key
P1694 Immobilizer-EMS Message Error > Verification of Vehicle Repair
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect GDS and select "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC
2. Operate the vehicle and monitor the DTC on the GDS.
3. Are any DTCs present?
▶Go to the applicable troubleshooting procedure.
▶System is performing to specification at this time.
P1694 Immobilizer-EMS Message Error > Circuit diagram
Schematic Circuit Diagram
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