P1694

DTC P1694 EMS MESSAGE ERROR

Component Location:

GENERAL DESCRIPTION
The ECM and the SMARTRA (BCM) communicate by dedicated line. During this communication of ECM and SMARTRA (BCM) the K line of ECM cannot be used for communication. The ECM controls the communication either to SMARTRA (BCM) 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
This DTC is defined as invalid request from ECM or corrupted data.

DTC Detecting Condition:

Schematic Diagram:

MONITOR SCANTOOL DATA
1. Ignition "ON" & Engine "OFF".
2. Connect Scan tool and clear the DTCs.




3. If the DTCs are retrieved again, monitor "CURRENT DATA" to check No. of Learnt key, ECM and KEY status.
4. Are both Key and ECM status learnt?

YES
- Fault is intermittent caused by poor contact in the SMARTRA's and/or ECM's connector or was repaired and ECM memory was not cleared. 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 - Go to " W/Harness Inspection" procedure.

COMPONENT INSPECTION
1. Check ECM
1. Ignition "ON" & Engine "OFF".
2. Perform Key Teaching Procedure in "Reference Data" described in General Information.
3. Is the Key teaching completed?

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 - Substitute with a known-good ECM and check for proper operation. If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.

NOTE:
1. Don't forget to prepare for the PIN of the vehicle before removing ECM from the vehicle.
2. Remember that substituting with a known-good ECM should be followed "The things to remember before repair (1)" in "Reference Data in General Information".
(In case of faulty ECM, it has to be replaced with "VIRGIN" or "NEUTRAL" ECM.)

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and monitor CURRENT DATA to check No. of Learnt key, ECM and KEY status.
2. Select "Diagnostic Trouble Codes (DTCs)" mode and Clear the DTCs.
3. Are any DTCs present?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.