Many malfunctions in the electrical system are caused by poor harness and terminals.

Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

Has a problem been found?

	▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ Go to next procedure.

Engine "ON"

headight and heatwire "ON".

Measure voltage between terminal (+) and (-) of battery maintaining ENG. RPM at 2,500RPM(idle) over 2 minutes.

Is "resistance" display near the specified value?

	▶ Go to "Power Circuit Inspection" procedure.
	▶ Go to "Power Circuit Inspection" procedure. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Ignition "OFF"

Disconnect 4WD ECU connector.

Ignition "ON" & Engine "OFF".

Measure voltage between ON/START INPUT terminal of 4WD ECU harness connector and chassis ground.

Is the measured voltage within specifications?

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Check for open or blown fuse referring to "Circuit Diagram". ▶ Repair open or short in power circuit between battery and 4WD ECU harness connector and then go to "Verification of vehicle Repair" procedure.

IG Key "OFF".

Disconnect 4WD ECU connector.

Measure resistance between ground terminal of 4WD ECU harness connector and chassis ground.

Is the measured resistance within specification ?

	▶ Substitute with a known-good "4WD-ECM" and check for proper operation. If the problem is corrected, replace "4WD-ECM" and then go to "Verification of Vehicle Repair" procedure. ▶ Check Mechanical problem of Transfer Case.
	▶ Check for open or contact resistance in ground harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.