10681404

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.

Perform checking procedure as follows.

(1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

(2)

Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring.

note

Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. ( after checking, reconnect the pin at correct position. )

Is the problem found?

	▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".
	▶ Go to "Signal Circuit Inspection ".

Check signal circuit voltage

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect MAFS connector

(3)

IG KEY "ON".

(4)

Measure the voltage between signal terminal of MAFS harness connector and chassis ground.

Specification : 4.8V~5.1V

(5)

Is the measured voltage within the specification?

	▶ Go to "Component Inspection".
	▶ Go to "2.Check open in signal circuit" as follows.

Check open in signal circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect MAFS connector and ECM connector.

(3)

Check continuity between signal terminal of MAFS harness connector and ECM harness connector.

Specification : Continuity (below 1.0Ω)

(4)

Is the measured resistance within the specification?

	▶ Go to "3.Check short to battery in signal circuit " as follows.
	▶ Repair open spots in signal circuit and go to "Verification of Vehicle Repair".

Check short to battery in signal circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect MAFS connector and ECM connector.

(3)

IG KEY "ON".

(4)

Measure the voltage between signal terminal of MAFS harness connector and chassis ground.

Specification : 0.0V~0.1V

(5)

Is abnormal voltage detected in the circuit with both connector disconnected?

	▶ Repair short to battery and go to "Verification of Vehicle Repair".
	▶ Go to "Ground Circuit Inspection".

Measure the voltage between signal terminal and groud terminal of MAFS harness connector. [ TEST "B" ]

( Signal terminal : Check + prove , Ground terminal 2 : Check - prove )

Specification : the voltage difference between TEST "A" and TEST "B" is within 200mV

Is the measured voltage within the specification?

▶ Go to "Component Inspection".

▶ When "B" voltage is not detected : Repair open in ground circuit and go to "Verification of Vehicle Repair".

▶ When the voltage difference between "A" and "B" is above 200mV : Eliminate the causes of excessive resistance and go to "Verification of Vehicle Repair".