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

GF1A TRANSFER / 4WD / AWD DYNAMIC TORQUE CONTROL AWD SYSTEM C1241 Low or High Power Supply Voltage

DESCRIPTION

If a malfunction in the power source circuit occurs, or a malfunction in communication with the skid control ECU (brake actuator assembly) or in a speed sensor occurs, the 4WD ECU assembly will prohibit operations by the fail-safe function.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1241	Low or High Power Supply Voltage	1. When the following continues for 10 seconds or more: - At a vehicle speed of 3 km/h (2 mph) or more, voltage of IG1 terminal is 9.5 V or less. - With an engine speed of 300 rpm or more, voltage of IG1 terminal is 9.5 V or less. 2. When either of the following is detected: - With the IG1 terminal voltage 9.5 V or less, communication with the skid control ECU (brake actuator assembly) is impossible. - With the voltage of IG1 terminal at 9.5 V or less, vehicle speed sensor voltage is reduced for 60 seconds or more. 3. When the following continues for 3 seconds or more: - With the IG1 terminal voltage 17 V or more, communication with the skid control ECU (brake actuator assembly) is impossible.	· Battery · Charging system · Wire harness or connector · Electronically controlled brake system · CAN communication system · 4WD ECU assembly

DTC Detection Conditions: C1241
		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5
Diagnosis Condition	At a vehicle speed of 3 km/h (2 mph) or more	○	-	-	-	-
	Engine speed is 300 rpm or more	-	○	-	-	-
	With the IG1 terminal voltage 9.5 V or less	-	-	○	○	-
	With the IG1 terminal voltage 17 V or more	-	-	-	-	○
Malfunction Status	Voltage of IG1 terminal is 9.5 V or less.	○	○	-	-	-
	Communication with the skid control ECU (brake actuator assembly) is impossible.	-	-	○	-	-
	Vehicle speed sensor voltage is reduced.	-	-	-	○	-
	Communication with the skid control ECU (brake actuator assembly) is impossible.	-	-	-	-	○
Detection Time		10 seconds or more	10 seconds or more	-	60 seconds or more	3 seconds or more
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip

HINT:: DTC will be output when conditions for any of the patterns in the table above are met.

WIRING DIAGRAM

4.958,2.698 6.521,3.063 1.563,0.365 10 false Skid Control ECU (Brake Actuator Assembly) 4.969,2.531 5.844,2.75 0.875,0.219 10 false A40 3.354,2.698 3.813,2.896 0.458,0.198 10 false L48 3.344,2.875 4.688,3.073 1.344,0.198 10 false 4WD ECU Assembly 0.75,3.271 2.698,3.458 1.948,0.188 10 false : CAN Communication Line 0.354,1.063 1.302,1.531 0.948,0.469 10 false from IGR NO. 1 Relay 2.052,1.229 3.146,1.427 1.094,0.198 10 false ECU-IGR NO. 3 3.406,0.917 3.563,1.115 0.156,0.198 10 false 3 3.583,1.042 4.042,1.24 0.458,0.198 10 false IG1 3.427,1.823 3.583,2.021 0.156,0.198 10 false 4 3.594,1.927 4.052,2.125 0.458,0.198 10 false GND

CAUTION / NOTICE / HINT

NOTICE:: Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

Check if CAN communication system DTCs are output.

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Start the engine.

Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if the speed sensor DTC (electronically controlled brake system DTC) is output.

Chassis > Brake/EPB > Trouble Codes: 50001 435

Result:

Result	Proceed to
Neither CAN communication system DTC nor speed sensor DTC (electronically controlled brake system DTC) is output	A
CAN communication system DTC is output	B
Speed sensor DTC (electronically controlled brake system DTC) is output	C

2.INSPECT BATTERY

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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

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2.INSPECT BATTERY

Check the battery voltage.

Standard Voltage:: 11 to 14 V

Result:

Proceed to
OK
NG

3.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

CHECK CHARGING SYSTEM

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3.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

2.417,0.083 2.833,0.333 0.417,0.25 1.938,1.927 2.24,1.927 2.24,1.927 2.333,1.177 true 1.688,1.854 2.031,2.052 0.344,0.198 10 false IG1 2.51,0.125 2.99,0.323 0.479,0.198 10 false L48 0.094,0.073 0.406,0.229 0.313,0.156 10 false *a

*a	Front view of wire harness connector (to 4WD ECU Assembly)

Disconnect the L48 4WD ECU assembly connector.

Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Click Location & Routing(L48)Location & Routingewd_type=routing;type=c;code=L48 Click Connector(L48)Body>No. 2 Floor Wire>4WD ECU Assemblyewd_type=component;type=c;code=L48;pinno=3
L48-3 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Tester Connection

Condition

Specified Condition

Click Location & Routing(L48)Location & Routingewd_type=routing;type=c;code=L48

Click Connector(L48)Body>No. 2 Floor Wire>4WD ECU Assemblyewd_type=component;type=c;code=L48;pinno=3

L48-3 (IG1) - Body ground

Ignition switch ON

11 to 14 V

Result:

Proceed to
OK
NG

4.CHECK HARNESS AND CONNECTOR (GND TERMINAL)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (GND TERMINAL)

Turn the ignition switch off.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(L48)Location & Routingewd_type=routing;type=c;code=L48 Click Connector(L48)Body>No. 2 Floor Wire>4WD ECU Assemblyewd_type=component;type=c;code=L48;pinno=4
L48-4 (GND) - Body ground	Always	Below 1 Ω

Tester Connection

Condition

Specified Condition

Click Location & Routing(L48)Location & Routingewd_type=routing;type=c;code=L48

Click Connector(L48)Body>No. 2 Floor Wire>4WD ECU Assemblyewd_type=component;type=c;code=L48;pinno=4

L48-4 (GND) - Body ground

Always

Below 1 Ω

Result:

Proceed to
OK
NG

5.RECONFIRM DTC

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.RECONFIRM DTC

Clear the DTC.

Chassis > Four Wheel Drive > Clear DTCs: 50002 118

Start the engine.

Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) 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

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

REPLACE 4WD ECU ASSEMBLY

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CHECK FOR INTERMITTENT PROBLEMS

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