DTC C1437: Lost Communication with ECM [12/2013 - 11/2016]: Procedure

1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC.

   Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2013 - 11/2016]

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   EFI Communication Open	ECM communication open detection	Error or Normal	Error: Momentary interruption Normal: Normal	-
   EFI Communication Invalid	ECM communication invalid detection	Error or Normal	Error: Invalid Normal: Normal	-

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   EFI Communication Open
   EFI Communication Invalid

   OK

   There are no momentary interruptions.

   HINT: 

   Perform the above inspection before removing the sensor and connector.

Result:

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:

OK 

Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2013 - 11/2016]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

3. Turn the ignition switch off.
4. Start the engine.
5. Perform a road test.
6. Check that no CAN communication system DTCs are output.

   Refer to DIAGNOSIS SYSTEM [12/2013 - 11/2016]

7. Check if the same DTC is output.

   Refer to DTC CHECK / CLEAR [12/2013 - 11/2016]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   Result	Proceed to
   DTC C1437 is not output.	A
   DTC C1437 is output.	B
   CAN communication system DTCs are output.	C

Result:

A 

USE SIMULATION METHOD TO CHECK. 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - 11/2016]

Result:

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. 

Refer to REMOVAL [12/2013 - 11/2016]

Result:

C 

INSPECT CAN COMMUNICATION SYSTEM. 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - 11/2016]