4WD ECM control EMC(Electric Magnet Clutch) by current and EMC distributes torque properly by using slip of multi-clutch.
4WD ECM control EMC(Electric Magnet Clutch) by current and EMC distributes torque properly by using slip of multi-clutch.
As related with EMC, this trouble code will set in case EMC output harness is open or shorted to battery.
Item | Detecting Condition & Fail Safe | Possible Cause |
DTC Strategy | ● Short/ Open to Battery | ● Power supply malfunction. ● EMC, 4WD ECM connector looseness and poor terminal to wire connection. ● EMC circuit open or short to battery. ● EMC motor faulty. ● 4WD ECM malfunction. |
Enable Conditions | ● Ignition cycle required | |
Threshold Value | ● - | |
Diagnostic Time | ● - | |
Fail safe |
Many malfunctions in the electrical system may be caused from poor harness and terminals. These faults can be caused by interference from other electrical systems and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to the next procedure.
EMC Signal Inspection
IG KEY ON, ENG IDLE
EMC connector : Connect.
Monitor signal waveform between terminal 1 of F43 harness connector and chassis ground.
Shift to N Range.
Specification : refer to 'Waveform Inspection'
Is EMC Signal display near the specified value?
▶ This may caused by intermittent fault. Verify data changibility by shaking the harness.
Keep 0V continuously.
▶ Inspect open or short in EMC output line.
▶ Check for 4WD ECM and replace it as necessary.
Keep B+ continuously
▶ Inspect open or short in EMC component inspection.
EMC output line open inspection
IG KEY OFF, ENG OFF
Electric Magnet Valve Clutch connector and 4WD ECM connector: Disconnect.
Measure resistance between terminal 1 of Electric Magnet Valve Clutch harness connector and terminal 26 of 4WD ECM harness connector.
Specification : Approx. 0Ω
Is resistance display near the specified value?
▶ Proceed next inspection procedure.
▶ Repair open circuit of EMC output harness.
▶ If problem is solved, go to the "Verification of Vehicle Repair".
EMC ground line open inspection
IG KEY OFF, ENG OFF
Electric Magnet Valve Clutch connector and 4WD ECM connector: Disconnect.
Measure resistance between terminal 2 of Electric Magnet Valve Clutch harness connector and terminal 13 of 4WD ECM harness connector M79.
Specification : Approx. 0Ω
Is resistance display near the specified value?
▶ Go to " Component inspection " procedure.
▶ Repair open circuit of EMC ground harness.
▶ If problem is solved, go to the "Verification of Vehicle Repair".
EMC output line short to ground inspection
IG KEY OFF, ENG OFF
Electric Magnet Valve Clutch connector : Disconnect.
Measure resistance between terminal 1 of Electric Magnet Valve Clutch harness connector and chassis ground.
Specification : Approx. ∞Ω
Is resistance display near the specified value?
▶ Proceed next inspection procedure.
▶ Repair ground to short circuit of EMC output harness.
▶ If problem is solved, go to the "Verification of Vehicle Repair".
IG KEY : OFF, Engine : OFF
Electric Magnet Valve Clutch connector : Disconnect.
Measure resistance between 1 & 2.
Specification : Approx. 1.8 ~ 2.2 Ω
The above value is just for reference. The data from vehicle may differ from it according as various vehicle condition.
This inspection is for checking open or short of EMC coil.
Is resistance display near the specified value?
▶ Replace with normal 4WD ECM temporarily and check if vehicle run normally.
If trouble is disappeared, replace 4WD ECM.
▶ If problem is solved, go to the "Verification of Vehicle Repair".
▶ Replace EMC coil.
IG KEY ON, ENG ON
Electric Magnet Valve Clutch connector and 4WD ECM connector: Disconnect.
Shift to N Range.
Check EMC output signal and verify the malfunction.
Does the scan tool display any DTC relevent to EMC signal?
▶ Go to the applicable troubleshooting procedure.
▶ System OK.
