Dtc C1437 Lost Communication With Ecm

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS

DESCRIPTION

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

RECONFIRM DTC

REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - ECM)

RECONFIRM DTC

DTC C1437 Lost Communication with ECM

DESCRIPTION

The skid control ECU (master cylinder solenoid) receives signals from the ECM via the CAN communication system.

DTC CodeDTC Detection ConditionTrouble Area
C1437When the IG1 terminal voltage is 10 V or higher and the vehicle speed is 15 km/h (9 mph) or more, data cannot be sent from the ECM for 2 seconds or more.
Engine control system
CAN communication system
Skid control ECU (Master cylinder solenoid)

INSPECTION PROCEDURE

  • NOTICE:
  • When replacing the master cylinder solenoid, perform calibration ().
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

Using the GTS, check for any momentary interruption in the wire harness and connector corresponding to the DTC ().

ABS/VSC/TRC
Tester DisplayMeasurement Item/RangeNormal ConditionDiagnostic Note
EFI Communication OpenEFI communication open circuit detection/ Error or NormalNormal-
  • OK:
  • Normal (there are no momentary interruptions).
  • HINT:
  • Perform the above inspection before removing the sensor and connector.
NG
Go to step 3
OK
2.RECONFIRM DTC

Clear the DTC ().

Turn the ignition switch off.

Start the engine.

Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

Check that no CAN communication system DTC is output ().

Check if the same DTC is output ().

Result
ResultProceed to
DTC C1437 is not outputA
DTC C1437 is outputB
CAN communication system DTC is outputC
  • HINT:
  • Refer to the Engine Control System (How to Proceed with Troubleshooting) procedures:
for 1VD-FTV, w/o DPF ()
for 1VD-FTV, w/ DPF ()
for 1UR-FE ()
for 3UR-FE ()
  • HINT:
  • Refer to the CAN Communication System (How to Proceed with Troubleshooting) procedures:
for LHD ()
for RHD ()
B
GO TO ENGINE CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
A
CHECK FOR INTERMITTENT PROBLEMS ()
3.REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - ECM)

Turn the ignition switch off.

Repair or replace the harness or connector.

Check for any momentary interruption between the skid control ECU (master cylinder solenoid) and ECM ().

Check that there is no momentary interruption.

NEXT
4.RECONFIRM DTC

Clear the DTCs ().

Turn the ignition switch off.

Start the engine.

Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

Check that no CAN communication system DTC is output ().

Check if the same DTC is output ().

Result
ResultProceed to
DTC C1437 is not outputA
DTC C1437 is output (for LHD)B
DTC C1437 is output (for RHD)C
CAN communication system DTC is output (for LHD)D
CAN communication system DTC is output (for RHD)E
B
REPLACE MASTER CYLINDER SOLENOID ()
C
REPLACE MASTER CYLINDER SOLENOID ()
D
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
E
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
A
END