0000-00 the e-coupling ecu monitors the can communication

The E-coupling ECU monitors the CAN communication signal and sets a diagnostic trouble code (DTC) if it is not normal.

DTC Detection condition Symptom

U0001 CAN communication error: bus OFF

Warning lamp ONCoupling torque set to 0 NmCAN message transmission stopped (keeps attempting to restore)

1. 2. 3.

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1. Component Location

2. Component Description

The CAN topology communicate with system units. There are 2 types of CAN communication according to the communication speed: P-CAN and B-CAN. Communication speed of the former is faster than that of the latter.While the SKM, instrument cluster, BCM, and diagnostic connectors use P-CAN and B-CAN communications to communicate with other units, Terminating resistors are installed in ECU and instrument cluster.

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1. Partial Circuit Diagram (G16DF )

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(D16DTF )

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2. Connector Appearance

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1. Troubleshooting

Connect the DSM to the OBD2 connector.Turn the ignition switch to the "ON" position.Clear any diagnostic trouble code (DTC).

1) 2) 3)

If the DTC occurs persistently, refer to the procedure described in the section "Check method".

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1. Check CAN Communication Line (P_CAN)

If the resistance cannot be measure, inspect the unit or check the wiring for open circuit.

Turn the ignition switch to the "OFF" position.Measure the terminal resistance between the terminals No. 6 P_CAN HIGH and No. 14 P_CAN LOW on the self-diagnosis connector according to each measuring condition.Measurement condition- With connector installed (measurement 1)- With ECU connector removed (measurement 2)- With instrument cluster connector removed (measurement 3)

1)

2)

3)

Measuring resistance

Tester connection (to wiring) Specified value

Terminal No. 6 ↔ Terminal No. 14

Approx. 60 Ω (measurement 1)



The ECU and instrument cluster have the terminal resistance of 120 Ω and

the terminal resistance of about 60 Ω is measured with the ECU and

instrument cluster connectors connected.

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2. Check CAN Communication Line For Short

Repair the CAN communication line which has a short circuit.

Turn the ignition switch to the "OFF" position.Disconnect all unit connectors which communicate through the CAN communication line.Measure the resistance between the terminals No. 6 P_CAN HIGH and No. 14 P_CAN LOW on the self-diagnosis connector.

1)

2)

3)



Terminal No. 6 ↔ Terminal No. 14 Infinite Ω

3. Check CAN Communication Line For Short Circuit (GND)

Repair the CAN communication line which has a short circuit to ground.

Turn the ignition switch to the "OFF" position.Disconnect all unit connectors which communicate through the CAN communication line.Measure the resistances between the terminals No. 6 P_CAN HIGH and No. 14 P_CAN LOW on the self-diagnosis connector and body ground.

1)

2)

3)



Terminal No. 6 ↔ BodyInfinite Ω

Terminal No. 14 ↔ Body

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4. Check CAN Communication Line For Open

Repair the CAN communication line which has an open circuit.

Turn the ignition switch to the "OFF" position.Disconnect all unit connectors which communicate through the CAN communication line.Measure the resistance between the terminal No. 6 P_CAN HIGH on the self-diagnosis connector and P_CAN HIGH terminal on each unit.Measure the resistance between the terminal No. 14 P_CAN LOW on the self-diagnosis connector and P_CAN LOW terminal on each unit.

1)

2)

3)

4)

Measuring voltage


Terminal No. 6 ↔ P_CAN HIGH terminal on

each unit Approx. 0 Ω

Terminal No. 14 ↔ P_CAN LOW terminal on

each unit

5. Final Service Check

This is to check the serviced item again for the last time after the service is completed. Erase DTC(s) again on the diagnostic device.Test drive the vehicle and check the vehicle has recovered its normal condition.

- - -

Perform the inspection procedures again after replacing the problematic unit.

Service completed (System normal)

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U0121

Wheel speed signal missing in 3 consecutive times or for 250 ms

Coupling torque limit, coupling opening request signal missing in 3 consecutive times or for 250 ms

U0415

Implausible wheel speed signal is received

Implausible signal for coupling torque limit is received


Warning lamp ONDefault value for wheel speed signal replaced by 0 rpmChanged to 2WD mode

1. 2. 3.

Output torque request by coupling control replaced by 3000 NmOther signals overridden

1. 2.

Warning lamp ONDefault value for wheel speed signal replaced by 0 rpmChanged to 2WD mode

1. 2. 3.

Output torque request by coupling control replaced by 3000 NmOther signals overridden

1. 2.

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(D16DTF )

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1. Troubleshooting


1) 2) 3)

Any DTC related to CAN communication should be checked and rectified first.If any DTC occurs at other unit, perform the diagnosis on the unit.

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2. Sensor Output

Connect the DSM to the OBD2 connector.Turn the ignition switch to the "ON" position.Check the change in sensor reading while driving the vehicle.Check the item "Wheel speed sensor".

1) 2) 3) 4)

Item Specification

Wheel Speeds Left Front

Varies with change in vehicle speedWheel Speeds Right Front

Wheel Speeds Left Rear

Wheel Speeds Right Rear

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U0101

Gear position signal missing in 3 consecutive times or for 250 ms

Gear lever position signal missing in 3 consecutive times or for 250 ms

U0402

Invalid gear position signal is received

Invalid gear lever position signal is received

Default value for gear position replaced by 1stShift gear stage estimated by torque

1.

2.

Default value for shift lever position replaced by "Reverse"PRNDL logic stopped

1.

2.

Default value for gear position replaced by 1stShift gear stage estimated by torque

1.

2.

Default value for shift lever position replaced by "Reverse"PRNDL logic stopped

1.

2.

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(D16DTF )

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1. Troubleshooting


1) 2) 3)

2. Sensor Output

Connect the DSM to the OBD2 connector.Turn the ignition switch to the "ON" position.Check the change in data value while driving the vehicle.Check the item "Trans Gear".

1) 2) 3) 4)

Item Specification

Trans Gear Varies with change in vehicle speed


--

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U0155

Ambient temperature signal missing in 3 consecutive times or for 250 ms

Default value for ambient temperature signal replaced by 21

M/T gear position or parking brake signal missing in 3 consecutive times or for 250 ms

U0423

Implausible ambient temperature signal received

Default value for ambient temperature signal replaced by 21

Implausible M/T gear position or parking brake signal received


Default value for M/T gear position replaced by "Reverse"Parking brake logic stopped

1.

2.

Default value for M/T gear position replaced by "Reverse"Parking brake logic stopped

1.

2.

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(D16DTF )

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1. Troubleshooting


1) 2) 3)

2. Sensor Output

Connect the DSM to the OBD2 connector.Turn the ignition switch to the "ON" position.Check the data values while moving the gear position.Check the items "Trans In Reverse, Trans In Neutral".

1) 2) 3) 4)

Item Conditions Specification

Trans In Reverse Gear in "R" position R

Trans In Neutral Gear in "N" position N


--

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U0100

Accelerator pedal position signal missing in 3 consecutive times or for 250 ms

Default value for throttle valve position replaced by 0%

Engine rpm or clutch pedal signal missing in 3 consecutive times or for 250 ms

Engine torque signal missing in 3 consecutive times or for 250 ms

Default value for engine torque replaced by 1,000 Nm

M/T neutral or engine running signal missing in 3 consecutive times or for 250 ms

Intake air temperature signal missing in 3 consecutive times or for 250 ms

Default value for intake air temperature signal replaced by 21

Engine and transmission specification code signal missing in 3 consecutive times or for 250 ms


Default value for engine RPM replace by 10,000 rpmDefault value for clutch signal replaced by "Active"

1.

2.

Default value for neutral signal replaced by "Inactive" (M/T)Default value for engine status replaced by engine running, cranking and IGN ON

1.

2.

Default value for engine specification replaced by D20DTFDefault value for transmission specification replaced by DSI6AT

1.

2.

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U0401

Implausible accelerator pedal position signal received

Default value for throttle valve position replaced by 0%

Implausible engine rpm or clutch pedal signal received

Implausible engine torque signal received

Default value for engine torque replaced by 1,000 Nm

Implausible M/T neutral or engine running signal received

Implausible intake air temperature signal received

Default value for intake air temperature signal replaced by 21

Implausible engine and transmission specification codes received

Default value for engine RPM replace by 10,000 rpmDefault value for clutch signal replaced by "Active"

1.

2.

Default value for neutral signal replaced by "Inactive" (M/T)Default value for engine status replaced by engine running, cranking and IGN ON

1.

2.

Default value for engine specification replaced by D20DTFDefault value for transmission specification replaced by DSI6AT

1.

2.

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(D16DTF )

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1. Troubleshooting


1) 2) 3)

2. Sensor Output

Connect the DSM to the OBD2 connector.Run the engine.Check the item "Engine Torque, Variant" on the diagnostic device.

1) 2) 3)

Item Specification

Engine Torque Below 1547.5 Nm

Variant Check if the engine and transmission specification codes match the vehicle.


--

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The E-coupling ECU monitors the coil control line signal and sets a diagnostic trouble code (DTC) if it is not normal.


P1728 Coupling coil control line is open

P1729 Coupling coil control line is shorted to power

P1730 Coupling coil control line is shorted to ground

Warning lamp ONCoupling torque set to 0 NmChanged to 2WD mode

1. 2. 3.

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The EMCD solenoid is in the E-coupling case and can't be removed separately.The E-coupling ECU controls the EMCD solenoid's current depending on the vehicle condition to adjust the torque to the rear axle.

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1. Partial Circuit Diagram


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1. Troubleshooting


1) 2) 3)

2. Sensor Output

Connect the DSM to the OBD2 connector.While driving the vehicle, check the following:Check the item "Coil Voltage".

1) 2) 3)

Item Conditions DTC set value

Circuit open Above 0.7 V or below 0.9 V

Shorted circuit to B+ Above 1.15 V or below 5 V

Short circuit to ground Above 0 V or below 0.8 V

Coil Voltage

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2. Check Control Wire For Short Circuit

Turn the ignition switch to the "OFF" position.Disconnect the E-coupling unit connector and EMCD connector.Measure the resistance between the control wire terminal No. 2 and ground wire terminal No. 1 of the EMCD wiring connector.

1) 2)

3)


Tester connection (to wiring) Specification

Terminal No. 2 ↔ Body Infinite Ω

Check the control wire for short circuit and repair as necessary.

1. Check Control Wire For Short Circuit To Ground

Turn the ignition switch to the "OFF" position.Disconnect the E-coupling unit connector and EMCD connector.Measure the resistance between the control wire terminal No. 2 of the EMCD wiring connector and the body ground.

1) 2)

3)



Terminal No. 1 ↔ Terminal No. 2 Infinite Ω


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4. Check Wiring For Open Circuit

Turn the ignition switch to the "OFF" position.Disconnect the E-coupling unit connector and EMCD connector.Measure the resistance between the E-coupling wiring connector and EMCD wiring connector.

1) 2)

3)

Measuring voltage


Terminal No. 2 ↔ Body Approx. 0 V


3. Check Control Wire For Short Circuit To Power

Turn the ignition switch to the "OFF" position.Disconnect the E-coupling unit connector and EMCD connector.Turn the ignition switch to the "ON" position.Measure the voltage between the control wire terminal No. 2 of the EMCD wiring connector and the body ground.

1) 2)

3) 4)


Tester connection(EMC ↔ E-coupling unit)

Specification

Terminal No. 1 ↔ Terminal No. 24Approx. 0 Ω

Terminal No. 2 ↔ Terminal No. 11

Check the EMCD wiring for open circuit and repair as necessary.

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Tester connection (component side) Specification

Terminal No. 1 ↔ Terminal No. 2 Approx. 2.2 Ω

Replace the EMCD part.

5. Checking Component

Turn the ignition switch to the "OFF" position.Disconnect the EMCD connector.Measure the resistance between the EMCD connectors No. 1 and 2.

1) 2) 3)

6. Final Service Check-up

Perform the inspection procedures again after replacing the E-coupling unit.


- - -


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The E-coupling control unit sets a diagnostic trouble code (DTC) if it calculates the difference of wheel speed based on the CAN signals and detects that an tire out of specification is mounted.


P1769 4 tire sizes are not identicalWarning lamp ONCoupling torque set to 0 NmChanged to 2WD mode

1. 2. 3.

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When a tire out of specification such as the spare tire is installed, the E-coupling control unit calculates the difference between the CAN signals on wheel speed to detect that the wrong tire has been installed. At this time, it reduces the torque to the rear wheels and sets a diagnostic trouble code (DTC).

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1. Troubleshooting


1) 2) 3)

2. Sensor Output

Connect the DSM to the OBD2 connector.Turn the ignition switch to the "ON" position.Check the change in sensor reading while driving the vehicle.Check the item "Wheel speed sensor".

1) 2) 3) 4)

Item Specification

Wheel Speeds Left Front

Varies with change in vehicle speedWheel Speeds Right Front

Wheel Speeds Left Rear

Wheel Speeds Right Rear

Check the tire for out of specification or tire pressure.Check that there is a speed deviation in each wheel speed sensor, if the corresponding DTC is set with a normal tire installed.

1. 2.

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The E-coupling ECU sets a diagnostic trouble code (DTC) if the coupling becomes too hot.


P1771 Coupling overheatsWarning lamp (blinks and stays on)Coupling torque set to 0 NmChanged to 2WD mode

1. 2. 3.

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The E-coupling control unit calculates the E-coupling's slip (input/output speed), ambient temperature, magnetic coil resistance and etc. to protect the oil and clutch plate from being overheated. If the E-coupling get too hot, the E-coupling control unit reduces the torque to the rear wheels and sets a diagnostic trouble code (DTC).

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1. Troubleshooting


1) 2) 3)

If the DTC occurs persistently, replace the E-coupling assembly.

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The E-coupling ECU monitors the battery supply voltage and sets a diagnostic trouble code (DTC) if it is not normal.


P3003 Battery supply voltage is lower than 8 V or above 17 V

Warning lamp ONCoupling torque set to 0 NmChanged to 2WD mode

1. 2. 3.

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The E-coupling control unit is mounted on the bottom of the floor mat under the front passenger seat. It is a control unit which monitors the CAN signals (e.g. wheel speed, engine torque, pedal value, ABS/ESP CAN signal) from other units to determine the current value (clutch clamping force) for the electronic magnetic in the E-coupling. It is essential to secure normal battery voltage and recharge voltage to control the system without any problem.

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1. Troubleshooting


1) 2) 3)

2. Sensor Output

Connect the DSM to the OBD2 connector.Turn the ignition switch to the "ON" position.Check the item "System Voltage" on the diagnostic device.

1) 2) 3)

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2. Check Power Wire

Turn the ignition switch to the "OFF" position.Disconnect the E-coupling unit connector.Turn the ignition switch to the "ON" position.Measure the voltage between the power wire terminal No. 13 of the E-coupling unit wiring connector and the body ground.

1)

2) 3)

4)

Measuring voltage


Terminal No. 13 ↔ BodyBattery voltage

(From min. 9 V to max. 16 V)

Check the battery itself and charging condition, and repair as necessary.

1. Check Charging System

Start the engine.Get the vehicle air conditioner, head lamp and other electrical load to work.Measure the voltages on the alternator terminal B and the battery.

1) 2)

3)

Measuring voltage

Tester connection Specification

Alternator terminal B ↔ Battery (-) Battery voltage(From min. 9 V to max. 16 V)Battery (+) ↔ Battery (-)

Check the power wire for open/short circuit and repair as necessary.

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3. Check Ground Wire

Turn the ignition switch to the "OFF" position.Disconnect the E-coupling unit connector.Measure the resistance between the ground wire terminal No. 12 of the E-coupling unit wiring connector and body ground.

1) 2) 3)



Terminal No. 12 ↔ Body Approx. 0 Ω

Check the ground wire for open circuit and repair as necessary.




- - -


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The E-coupling control unit monitors the 4WD LOCK switch and sets a diagnostic trouble code (DTC) if it is defective.


P1739 4WD LOCK switch stays stuck for more than 30 sec.

Fixed to AWD auto mode

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The 4WD LOCK switch is integrated to the lower main switch.Pressing the 4WD LOCK switch activates the 4WD LOCK mode and illuminates the 4WD LOCK indicator lamp on the instrument cluster. In 4WD LOCK mode, the 4WD LOCK control works in the same way as the AUTO mode, but the more driving force is sent to the rear wheels than in AUTO mode.

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1. Fault Diagnosis


1) 2) 3)

If the DTC occurs persistently, refer to the procedure described in the section "Check method".

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2. Check Signal Wire Voltage

Turn the ignition switch to the "OFF" position.Disconnect the lower main switch connector.Measure the voltage between the No. 19 signal wire terminal of the connector to the lower main switch wiring and the body ground.

1)

2)

3))

Measuring voltage


Terminal No. 19 ↔ Body Approx. 11.15 V

Replace the lower main switch.

1. Checking Component

Turn the ignition switch to the "OFF" position.Disconnect the lower main switch connector.Measure the resistance between the terminals No. 19 and 13 of the connector to the lower main switch unit.

1)

2)

3)

If the voltage reading is 0 V, check the signal wire for short circuit to ground or open circuit and repair as necessary.


Tester connection (component side) Specification

Terminal No. 19 ↔ Terminal No. 13During operation (depressed): approx. 0 Ω

During non-operation: infinite Ω

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This is to check the serviced item again for the last time after the service is completed.Erase DTC(s) again on the diagnostic device.Test drive the vehicle and check the vehicle has recovered its normal condition.

- - -


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0000-00 the e-coupling ecu monitors the can communication

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