RM38N0EC _52 Drivetrain _119335 GF1A TRANSFER / 4WD / AWD _0524142 DYNAMIC TORQUE CONTROL AWD SYSTEM C

GF1A TRANSFER / 4WD / AWD  DYNAMIC TORQUE CONTROL AWD SYSTEM  C1337  Diameter of the Tire is not Uniform  


DESCRIPTION

The 4WD ECU assembly outputs this DTC if a difference in tire size is detected.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1337 Diameter of the Tire is not Uniform When the following continues for 36 seconds or more:
At a vehicle speed of 30 km/h (19 mph) or more, the average speed difference between the front wheel and rear wheel is 4% or more.
·

Tire size or pressure (front and rear tires)

·

Speed sensor circuit

·

Front speed sensor

·

Rear skid control sensor

·

Front speed sensor rotor (front axle hub sub-assembly)

·

Rear speed sensor rotor (rear axle hub and bearing assembly)

·

Wire harness or connector

·

Skid control ECU (brake actuator assembly)

·

4WD ECU assembly



PROCEDURE

1.CHECK TIRE CONDITION
a.

Check the size and condition of all 4 tires.

HINT:

This DTC is output when tire deformation or a difference in tire size is detected.


OK:

The diameter and air pressure of all 4 tires are the same.



Result:
Proceed to
OK
NG



OK

2.CHECK FOR DTC

NG

PERFORM AIR PRESSURE ADJUSTMENT OR REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE

2.CHECK FOR DTC
a.

Clear the DTCs.

Chassis > Four Wheel Drive > Clear DTCs
50002 118

b.

Start the engine.


c.

Drive the vehicle at a speed of 30 km/h (19 mph) or more for 36 seconds or more and check if the same DTC is output.

Chassis > Four Wheel Drive > Trouble Codes
50001 118

d.

Check if any speed sensor DTCs (electronically controlled brake system DTC) are output.

Chassis > Brake/EPB > Trouble Codes
50001 435

e.

Read the DTCs using the GTS.

Result:
Result Proceed to
Only DTC C1377 is output A
No DTCs are not output B
Speed sensor DTC (electronically controlled brake system DTC) is output C




A

3.CHECK HARNESS AND CONNECTOR (SPEED SENSOR - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))

B

CHECK FOR INTERMITTENT PROBLEMS

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


C

REPAIR CIRCUIT INDICATED BY OUTPUT CODE (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model)>DIAGNOSTIC TROUBLE CODE CHART


3.CHECK HARNESS AND CONNECTOR (SPEED SENSOR - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))
a.

Make sure that there is no looseness at the locking part and the connecting part of the connectors.


b.

Turn the ignition switch off.


c.

Disconnect the A40 skid control ECU (brake actuator assembly) connector.


d.

Disconnect the A41 front speed sensor RH connector, A42 front speed sensor LH connector, j2 rear skid control sensor RH connector and/or k2 rear skid control sensor LH connector.


e.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
for Front Speed Sensor RH:
Tester Connection Condition Specified Condition

Click Location & Routing(A40,A41)Location & Routing

Click Connector(A40)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Actuator Assembly

Click Connector(A41)Engine Compartment>Engine Room Main Wire / Transmission Wire>Front Speed Sensor RH

A40-21 (FR+) - A41-1 (FR+) Always Below 1 Ω
A40-21 (FR+) or A41-1 (FR+) - Body ground Always 10 kΩ or higher
A40-26 (FR-) - A41-2 (FR-) Always Below 1 Ω
A40-26 (FR-) or A41-2 (FR-) - Body ground Always 10 kΩ or higher

for Front Speed Sensor LH:
Tester Connection Condition Specified Condition

Click Location & Routing(A40,A42)Location & Routing

Click Connector(A40)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Actuator Assembly

Click Connector(A42)Engine Compartment>Engine Room Main Wire / Transmission Wire>Front Speed Sensor LH

A40-24 (FL+) - A42-1 (FL+) Always Below 1 Ω
A40-24 (FL+) or A42-1 (FL+) - Body ground Always 10 kΩ or higher
A40-7 (FL-) - A42-2 (FL-) Always Below 1 Ω
A40-7 (FL-) or A42-2 (FL-) - Body ground Always 10 kΩ or higher

for Rear Skid Control Sensor RH:
Tester Connection Condition Specified Condition

Click Location & Routing(A40,j2)Location & Routing

Click Connector(A40)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Actuator Assembly

Click Connector(j2)Body>Parking Brake Wire Assy>Rear Speed Sensor RH

A40-22 (RR+) - j2-2 (RA+) Always Below 1 Ω
A40-22 (RR+) or j2-2 (RA+) - Body ground Always 10 kΩ or higher
A40-37 (RR-) - j2-1 (RA-) Always Below 1 Ω
A40-37 (RR-) or j2-1 (RA-) - Body ground Always 10 kΩ or higher

for Rear Skid Control Sensor LH:
Tester Connection Condition Specified Condition

Click Location & Routing(A40,k2)Location & Routing

Click Connector(A40)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Actuator Assembly

Click Connector(k2)Body>Parking Brake Wire Assy>Rear Speed Sensor LH

A40-39 (RL+) - k2-2 (LA+) Always Below 1 Ω
A40-39 (RL+) or k2-2 (LA+) - Body ground Always 10 kΩ or higher
A40-23 (RL-) - k2-1 (LA-) Always Below 1 Ω
A40-23 (RL-) or k2-1 (LA-) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.PERFORM DEALER MODE (SIGNAL CHECK)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.PERFORM DEALER MODE (SIGNAL CHECK)
a.

Turn the ignition switch off.


b.

Perform the sensor check in the Signal Check.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model)>SIGNAL CHECK

OK:

All Dealer Mode (signal check) inspection items are normal.



Result:
Proceed to
OK
NG



OK

5.RECONFIRM DTC

NG

6.CHECK SPEED SENSOR ROTOR
5.RECONFIRM DTC
a.

Clear the DTCs.

Chassis > Four Wheel Drive > Clear DTCs
50002 118

b.

Start the engine.


c.

Drive the vehicle at a speed of 30 km/h (19 mph) or more for 36 seconds or more and check if the same DTC is output.

Chassis > Four Wheel Drive > Trouble Codes
50001 118

Result:
Result Proceed to
DTC is output A
DTC is not output B



A

REPLACE BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR (for Gasoline Model)>REMOVAL


B

CHECK FOR INTERMITTENT PROBLEMS

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


6.CHECK SPEED SENSOR ROTOR
a.

Turn the ignition switch off.


b.

Remove the front speed sensor rotor (front axle hub sub-assembly) or rear speed sensor rotor (rear axle hub and bearing assembly).

for Front Side: Click hereDrivetrain>AXLE AND DIFFERENTIAL>FRONT AXLE HUB>REMOVAL

for Rear Side: Click hereDrivetrain>AXLE AND DIFFERENTIAL>REAR AXLE HUB (for AWD)>REMOVAL


c.

Check the speed sensor rotor.

OK:

No scratches, oil, or foreign matter on the rotors.


NOTICE:

Check the speed sensor signal after cleaning or replacement.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model)>SIGNAL CHECK


HINT:
·

If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.

·

If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.




Result:
Proceed to
OK
NG



OK

7.REPLACE SPEED SENSOR

NG

CLEAN OR REPLACE SPEED SENSOR ROTOR

8.RECONFIRM DTC
a.

Clear the DTC.

Chassis > Four Wheel Drive > Clear DTCs
50002 118

b.

Start the engine.


c.

Drive the vehicle at a speed of 30 km/h (19 mph) or more for 36 seconds or more so that the same DTC is output.

Chassis > Four Wheel Drive > Trouble Codes
50001 118
Result:
Result Proceed to
DTC is output A
DTC is not output B


HINT:

Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking DTCs.




A

9.REPLACE BRAKE ACTUATOR ASSEMBLY

B

END

10.RECONFIRM DTC
a.

Clear the DTC.

Chassis > Four Wheel Drive > Clear DTCs
50002 118

b.

Start the engine.


c.

Drive the vehicle at a speed of 30 km/h (19 mph) or more for 36 seconds or more so that the same DTC is output.

Chassis > Four Wheel Drive > Trouble Codes
50001 118
Result:
Result Proceed to
DTC is output A
DTC is not output B




A

REPLACE 4WD ECU ASSEMBLY

Click hereDrivetrain>GF1A (TRANSFER / 4WD / AWD)>4WD CONTROL ECU>REMOVAL


B

END